Misfire at highway speed. cap, plugs, wires and egr valve.

Oct 26, 2017 · 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 81 300 six misfire - Hi All, Newbie here. I ran into town for a new set (new in box they were already higher at about . Vibration at high speed is not good, even for an old car. Aug 6, 2024 · 1978 - 1996 Big Bronco - 1990 Ford Bronco 5. There’s also a slim chance you could have simply filled up your car with a tank of gas that has gone bad. Now release the throttle and watch the gauge as the speed drops. I don't think it is a torque converter lockup issue, as it seems to be RPM related and not speed related. Jul 7, 2006 · Not sure how else to describe it, it feels like the engine is misfiring at highway speed. Have An Occasional Engine Miss At Highway Speeds. was struggling to make highway speeds) Fuel consumption is down, so it seems all is well with it. Mar 20, 2020 · I got this truck 2 months ago with 50k miles on it. One code recoded, "engine misfire". Apr 2, 2018 · when at a stop light, inching forward the truck shakes and the misfire is apparent, also when backing up you'll feel it. 3. Cam/crank relearn needed. Apr 12, 2016 · Within the last month or two I bought a 2003 GMC Sierra 2500HD 4x4 extended cab short bed with the 6. Misfire at highway speed, no service engine light. May 19, 2017 · Ok so I have a 96 GMC Sierra with the 5. 0 5spd Hello, I changed my spark plugs yesterday and did a transmission fluid change. Jan 29, 2023 · Replacing the upstream sensor seems to help. It will appear at other times, but that scenario is the most predictable. just had to change coils and plugs on a 10 acadia thursday due to a misfire underload at highway speed and the owner Jun 18, 2012 · During light acceleration and at low speeds (city driving 35 mph or so) the truck seems to run fine. I have replaced the MAF sensor twice, PCV Valve, Air Filter, Fuel Filter, Sparkplugs to NGK Iridium IV and plug wires to NGK as well. you are using aftermarket plugs in your acadia . I have used a bottle of injector / valve cleaner in the gas tank and I changed Jul 19, 2022 · All of the issues began when the transmission began to shudder. After some research, there are problems with the CAC and many of the trucks left the factory with Mis-Gapped plugs. The rpms are low since the truck is in its 5th or 6th gear, typically around 1000-1500rpm. Speed(mph) : 66 Interestingly enough, is says evap systems check ok even tho there is 2 evap codes (before it showed evap system fault) and every other system is checked ok. Aug 11, 2023 · The lean misfire condition is likely to disappear at highway speeds due to the more efficient flow into the combustion chambers. Aug 26, 2016 · when I try to stay at 40 45 mph my car chugs jerks slightly, but when I hit the gas it goes away only usually at those speeds. Just started yesterday. Up until now its been 40K miles of automotive bliss. Misfire Random Code Apr 28, 2017 · Then again, the misfire could be something unrelated to the work they did. Jun 27, 2022 · If I’m “shifting” with the paddles instead of driving in automatic I don’t get the stutter until highway speeds in “gear” 6. All the sudden the car jerked. May 12, 2016 · So at the end of last season my bike started to misfire at 60+ mph. RepairSmith's Blog puts you in the driver seat when it comes to car advice, travel tips, and more. The worst of the missing is at light throttle at highway speeds,also an occasional backfire and bucking. This started out very minor at first it was no worse than a ruff road unless you looked at the tach, then progressively got worse to very bad. It misfires bad in 4th gear around 1500 rpms or soat highway speedsif I put the van in D instead of OD,it wont misfire as much. 0 missing?Hesitating?at hwy speeds-intermittent - Going down the highway at 60-65 my truck will occasionaly start missing and surging-kind of hard to explain and it doesn't do it all the time. I checked out my O2 sensor and saw that there was a little bit of oil leaking from the valve cover. No code. Basically when I am on the highway at cruising speed say 60MPH, and I go into the other lane to gradually pass somebody in single digit increase increases (see speedo going 61, 62, 63, etc), the truck stumbles very bad. Runs rough at highway speed, accelerates very poorly, lacks power and mpg of approx. 10mpg on highway. Dec 29, 2019 · 2009 - 2014 F150 - 2013 F150 Ecoboost Highway Speed Acceleration Shudder with Bumping - Hi, I just did Austin to Dallas round trip in 2013 F150 Ecoboost 125k and had some badness. Jun 12, 2011 · It happens over 80km/h and the rpm will drop and go back up within a second, it feels like a cylinder is misfiring but it will not throw any codes. merging onto highway ) Report. Feb 20, 2017 · Some 2017 F-Super Duty, E-Series, F53 Motorhome, F59 Chassis, F-650/750 vehicles equipped with a 6. Jul 27, 2020 · I would say your description is spot on. Always a P0300, random misfire. ? cause. Most of the time if you turn the car off and come back to it, it will drive perfectly fine and then do the same thing when you get 15 minutes or so on the highway. We're not talking about a knocking engine or one that idles rough or stalls. 7 L with Ecoboost. if i stop after driving awhile and start it hot i get engine misfire on cylinder 4. (Although no two converters fail exactly the same, if fuel trim goes high under acceleration on only 1 bank, suspect a restriction on Nov 26, 2016 · Only when driving normally street or highway from 40-70 MPH and RPMs drop to 1500 +/-. 7 Vortec with a misfire, P0300 code for 3 months. I dropped it into low and ran it up to 2500 rpm and it really backfires and bucks a lot when doing this. Nov 19, 2014 · A misfire is what happens when a cylinder fails to combust its air/fuel mixture correctly. So here are some tips you can follow to find that leak. I took it to the closest dealer who swapped coils from cyl 4 to cyl 2 and cleared the code, but couldn't replicate the issue. I plugged in my code reader and got a P0304 code. Drove in last night in good rain, but driving home today when I would accelerate there was stutter and bumping. I have started paying better attention to when I start feeling the misfire. It's an '01 V70 XC with 135,000 miles on her. ? will computer continue to react this way with code in memory or Jan 16, 2011 · It came again the day before yesterday! But after 3 times highway driving about (3x60miles) yesterday and several miles' local driving, it is off again. If the results look good, you’ve most likely corrected the problem. 3L w/92,000. P0305 Cylinder #5 Misfire. After driving it on the interstate (cruise set at 75) the check engine light will come on and flash within a minute. When cold, will accelerate to highway speed, no misses, but after cruising smoothly for awhile at 70 mph, any increase of speed, no matter how gentle, causes engine to miss and car to buck hard. When the issue occurs, the car is at highway speed (60-70mph) and it starts shaking, with the shaking increasing until the check engine light starts to flash and "TRAC OFF" light turns on. Tach stays steady, boost gauge (Tied to MAP sensor) flutters from 3PSI or so to 0 - bouncing around in synch with the power loss. I replaced the spark plugs, plug wires, distributor and cap, rotor, coil and the spider injector. Oct 27, 2010 · When I could not solve the misfire, I took the truck to Rick Hall's Auto Doctor in Tempe. ). When I’m travelling along the highway with cruise control on and I go on a slight incline, the engine begins to burble/misfire after that slight load is introduced. Jun 12, 2019 · I was up at high elevation (>8-9,000 ft) and had been driving highway speeds (>65mi) for quite a bit of the day. Aug 31, 2017 · My 2007 XC70 runs fine most of the time. Dec 21, 2014 · The truck began to idle pretty rough; I could definitely feel the misfire at idle. No random misfire, no cutting out. Coil Packs: P0300 (random misfire) P030X(Where X = the misfiring cylinder) You should hear the misfire when revving the engine when the vehicle is parked. Runs smooth under acceleration. Sep 7, 2023 · I haven't begun to pull plugs or anything since most of that is newer, I'll touch on that in a second. The engine may vibrate or tremor as a result of a combustion misfire. 0L. had to fire up ole' Faithful (1997 Chevy Z71 with 397,00 miles) and drive her for the next week or so. inspected plugs, wires, cap & rotor, all tested good. 7 vortec, the engine was replaced with one that had 120000 on it, it was a NDOT rig that is in great shape no leaks with all maintenance done on time, I have changed all plugs wires and cap/rotor I haven't done a compression test yet but I keep getting a random cylinder misfire code and I haven't found anything on the forum as to a fix for the issue any You've got an engine that idles perfectly and drives down the road smoothly with no noticeable issues, but when you hit the gas hard, the engine drops out. Say your doing about 30-40mph in 4th, I put my foot down and it seems to stutter or misfire. I'll have the cruise set at 75 and suddenly the truck lurches and the tach starts bouncing all over the place. A misfiring engine is one of the most common reasons your Ranger will shake when accelerating. Jan 26, 2023 · It idles beautifully but under any load it starts sputtering like it can't breathe, even in park if I try to gun it there is hesitation. 0L misfire - My 2013 F150 5. 5L Ecoboost developed a severe misfire at 65k miles. 7L, 103,000 miles; stutters like complete shutdown while cruising, never while under load. None of this helped besides the spider injector making the truck run a bit better but the blinking check engine light still happens at highway speeds. 3L v6. May 3, 2022 · Hi all! Hopefully there is someone out there that can help me! I have a 2006 Silverado w/t 4. P0308 Cylinder #8 Misfire. I’ll swap the plugs soon although my car only got 39k miles one it. Feb 10, 2011 · Ford Ranger Engine Buck/Misfire at Freeway Speeds - 283 reports. The issue may lead to difficulty in gaining speed, affecting the overall performance of the vehicle. Pulling the code, it was a cylinder 3 and 4 misfire. A minute of so later, the it happened again, and it knocked the cruise off and I heard a relay click from around the center console area. So multiple cylinder misfire. 0L Automatic Save Share Jan 23, 2014 · I've experienced the bucking at highway speeds, misfire under light load, particularly going up mild grades or big hills, happens when on cruise (or not). 0L Power Stroke Diesel - 6. I came back to pick up the truck, and they told me the truck was fine and the bill was $100. 2,130k While crusing at highway speeds(90-115km) and on back roads going up small hills and slight inclines my truck studders/missfires, If I stomp on the gas it clears up, but once I get back to crusing speeds the Oct 22, 2017 · I've attached screenshots of freeze frame data from P0300 code as well as misfire counts and fuel trims at low and high RPM (current misfire count on left, history misfire on right) Attachments Screenshot_20171022-170458. 5" OME HD springs and front Bilstein/rear Rancho shocks, Barricade 9500 winch, custom front and rear bumpers, 136 amp alternator, 35" Super Swamper LTBs. ) 4. To avoid the stutter I usually have to use the paddles and maintain a higher rpm at cruising speed than I’d like (for example at 70 mph I’ll keep it in “gear” 5 at around 3000 rpm). Reply Like. Right around 40 mph. Customer: I have a 2005 Chevy Silverado 4. Usually, a leak of this kind will cause one or more cylinders to misfire at idle or low speeds, but will disappear once you get to the highway. 12-14 Nov 15, 2001 · During cruising in 4th or 5th gear, when trying to hold constant speed and RPM between 1800 and 2200 - engine starts to hesistate or studder - like a miss. The misfire seemed to go away for a while then came back and started to sound like it was starving for fuel to start when it was hot. It does this a little bit in all gears but it’s a lot more noticeable at higher speeds where the gears don’t have as much torque. 8 @ 4. Here are some common misfire causes. Oct 25, 2022 · MOST noticeable at highway speed, higher rpm, wide open throttle( like when passing a car on the highway). Final words. Customer: Cyl 5 misfire code 0305. At one point had a p2195 code also. Apr 23, 2022 · 3. I bought it with a bit of a misfire, which I figured wouldn't be too hard to fix. The general scerneio is that I'll be driving for 30 min or an hour and then it will start misfiring and If tire issues cause vibration on highway speed, $20 can fix it. Feb 23, 2023 · When an engine misfire occurs, you may feel a strong or light jerk coming from the engine. Sep 26, 2019 · A misfire is the most common reason your Chevy Aveo isn’t accelerating. Generally, a misfire will trigger the engine check light and the truck's exhuast will smell like gasoline. Nov 7, 2007 · Please allow me to share in this aggrevation. It threw the following codes: P0340 P0344 P1316. Fouled plugs from old gas causes random, non rythmic misfire, unless just one plug is so fouled it won't fire at all. Spark Plugs– Even under the best conditions, spark plugs will eventually need to be replaced. P0303 Cylinder #3 Misfire. Lately its been having an issue where it will start misfiring while on the highway. 0 issues, shortly after putting on straightpipes, I started noticing a slight misfire break up under medium accelaration or cruising at highway speeds when I come to even a slight hill. I've been trying to diagnose a random / multiple misfire code for a few weeks now and have exhausted all my options (at least all that I know). I used the OEM recommended plugs. Showing code P300/service engine light -random misfires, only when the engine is at or exceeds 2600 RPM both in idle and on the highway. As mentioned by someone else My blazer seems to hesitate at real low speed. The powertrain control module monitors the crankshaft speed and has detected a misfire Dec 21, 2022 · An engine misfire issue could also be the cause of the vibration at highway speeds. What else should I change? My car has 138000 miles. Google/search: acadia coil pack Mar 15, 2014 · I removed the plugs, inspected them and buffed the firing tip and the receiving point with a little sandpaper, but they all looked good anyway. P0307 Cylinder #7 Misfire. The actual repair cost depends on the cause of the problem. Nov 1, 2019 · Codes present: p0300, p0301, p0302. 031), and this has solved it completely. The reading at autozone said misfire on cylinder 3 check 2&4 don't know the code. Misfire. Jul 29, 2023 · Engine surging at highway speeds can be both alarming and frustrating for drivers. Which sent us in weird directions. Jun 19, 2019 · I am having similar issues like you as well but I don't run EFI or TBI but just a holley carburetor on a edelbrock single plane intake and I have been chasing a misfire faint stuttering at lower rpm cruise around town that goes away at highway speeds and I have changed out pretty much my whole ignition stuff and several carb adjustments and a Feb 27, 2011 · 06-07-30-020 TSB LP1/LY7 Intermittent Engine Chuggle at Highway Speeds During Light Throttle Load (Reprogram Transmission Control Module (TCM)) PIP3456D PI TCC Drone Surge Shudder Or Chuggle - keywords 5L40E 5L50E automatic calibration converter engage torque PIP3456C PI TCC Drone Surge Shudder Or Chuggle - keywords 5L40E 5L50E automatic engage PIP3658B PI TCC Surge, Chuggle, or Fishbite 5L40E Aug 25, 2008 · Let me begin by apologizing for the long post. The truck will start, run, drive, then randomly lose all power and will sometimes stall out completely. I replaced the plugs and wires with Ac Delco units. It lasts for a second or two and the settles back out. P0302 Cylinder #2 Misfire. Still had 1&2 misfire. Recently it started having this "rpm bounce" , about 100-200 rpm when driving about 40-50mph. Oct 12, 2017 · The weirdest parts about it are 1) it doesn't happen every time I get on the highway and 2) if I downshift it sometimes solves the problem temporarily and lets me drive in low gear/low speed (in 4th gear at about 40-45 mph). Just like a tire that you let the air out of. " May 7, 2014 · Hello! Recently a CEL popped up blinking while on the highway. I have replaced dist. Swapped the O2 sensor and has been fine since. First, let's pinpoint exactly what's going on. May 6, 2014 · The pre-2000 ignition system uses a separate igniter to trigger the coils. That's where I've been since. com Nov 6, 2014 · Then it really shutters and falls on it's face. It was intermittent and occurred at different speeds and roadway condition (level, uphill, etc. I was wrong. A misfire could be caused by not enough fuel getting into your cylinder, leading to an oxygen-heavy explosion. As soon Aug 2, 2020 · Only happens at highway speeds that i can tell and slight acceleration. 9 does a mix of both, and it seems, if my # plugg is not completely fouled it will throw a code at high speed, and when the computer checks it again aim at a low speed and the code is gone, but it does sound like a partially fouled plug, if it is partially fouled and still firing the ecm wont throw a misfire plug, so it will mean a tune up, or it could be just the gas in it, when Mar 22, 2009 · '03 chevy 6 ltr in express van misfires at highway speeds picked up by computer which cuts gas and tries to reset until stall. If I stomp on the gas there seems to be no problem. light" but goes off soon after; new plugs, cap, rotor, wires look fairly new; 1996 K1500 5. Inspected exhaust, and performed back pressure test and exhaust passed, no restrictions in the exhaust. png Aug 1, 2019 · I had a hard time describing what it was, but now this is the clearest description of the issue. Jan 5, 2021 · Knowing it was a bad misfire I replaced everything I could think of. Some of the causes for a lean condition are EGR valves that are stuck in the open position, leaking intake manifold gaskets, faulty mass air flow sensors if your vehicle is so equipped and plugged fuel filters and bad Jul 16, 2015 · Dear Community, My 1998 Honda CRV, automatic transmission, has 286,000 miles. It occurs when a vehicle’s engine speed fluctuates or struggles to maintain a constant RPM while cruising or accelerating. Over the course of a week, the idle became more rough and started feeling an intermittent misfire at different speeds (though I would always get a really bad shutter at 45-55 MPH). Anyone well versed in the problem? Sep 18, 2017 · As driving my engine starts to misfire at 65-75 mph and throws a "service engine soon" light. I have noticed the misfire when cruising at highway speed after driving about 20 minutes and feeling a sudden lurch, or when sitting at a red light idling. Also more noticeable when the engine is warm. I have also tried to see if the condition would worsen under hard acceleration at highway speeds, but have no problems. At the same time it has started to vibrate and kind of stutter when gearing down while going uphill, again when around 1600-1800 RPM and most noticeable Dec 29, 2005 · Derek, Are you sure it wasn't a tranny shudder? I'm taking my KJ in for the tranny TSB - 21-016-05 this morning. It goes from overdrive to drive (1800 rpm upto 2200 rpm). Compression checked out okay. May 25, 2016 · I started to have a slight misfire when accelerating to get on the highway. P0300 Random Cylinder Misfire. Oil on the plugs, the wrong or bad spark plugs can cause a misfire. 9L. If I let off the gas pedal, the vibration will stop. The truck had a complete tune up done by me roughly 15k miles ago. 3L w/6 speed w/66,000 miles. Apr 8, 2024 · When the car drives longer distances however, under load at lower rpm, the car will shake and eventually fully misfire and throw the code. One of my observations is that this is probably where the highest sustained rpm's are taking place. Mostly not felt, some yes at highway speeds. One of the conditions that is required to set the code is a fuel level over 11 percent. I explained that the misfire only took place at high speed under load. Still had misfire. My truck starts cold fine. At low speeds it runs fine. Never lit the CEL. BUT Jan 1, 2017 · FYI post. Jun 8, 2021 · We tried distributor, cap, rotor, plugs, wires etc. About 3k miles later, I started noticing misfires or "pinging" in two situations: (a) when accelerating at highway speeds, like while passing, and (b) when climbing hills. Aug 6, 2012 · It only happens at highway speeds above 50 or 60 and also will I do anymore damage by driving it back and forth to work? 2001 wrangler 4. There's two coils in the coil pack, one for the spark plugs of cylinders 1 and 2, and the other for the plugs of cylinders 3 and 4, and, there's corresponding triggering circuits for those pairs of cylinders in the igniter. Never occurs under 2600 RPM or when the engine is "cold" and exceeding 2600 RPM. 0) and I tuned it up (plugs, wires, cap, rotor) a year ago. We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck. It could misfire continuously or periodically. What I know that the 2015 has the same exact engine as the 2011-2014 and the new engine was redesigned in 2016. Data log and scan tools all showed negative fuel trims, correct fuel pressure, no codes, but random misfire while in this condition and trying to accelerate out of it. After cleaning, redo the compression and cylinder leak-down test. (a 4. P0300 cylinder misfire detected- random cylinders explanation. put them back in (I replaced them at 75,000 miles), I thought I had cured the problem, but then I got out on the highway, got it warmed up and it felt like it was running on three or even two cylinders Aug 16, 2014 · Restart the engine and drive at highway speeds for at least 10 minutes. If I drop to 5th gear and get to around 2,000 rpms, the shudder goes away. in my experience that motor does not like after market plugs or coils. Customer: P0300 code= misfire; happens at cruising speed (70-75mph); occasional "ck eng. Learn about this problem, why it occurs, and how to fix it. Frequency Seems To Increase As Speed/rpms Increase How to Repair an Engine Cylinder Misfire. I was driving it on the freeway the other day going about 65mph and the engine "bucked" or cut out as if it misfired twice back to back. My average mpg is down 3 or so points. Jan 28, 2019 · Driving at low speed feels like the car hit a brick every so many feet on a dead cylinder. I replaced spark plugs all but number 3 today didn't change anything, change tps nothin, changed air tempature sensor and no change. Jul 25, 2011 · So I thought I had fixed all my 6. When we are driving at highway speed and accelerate, e. Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. 8L engine with an engine built on 10-Sep-2016 and through 15-Feb-2017 may exhibit multiple misfire diagnostic trouble codes (DTCs) P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0306, P0307, P0308, P0309, P0309 and/orP0310. Letting off of the accelerator and varying speeds seems to temporarily help the problem, but it comes back if at a sustained speed for a while. We used Mitchell 1 to look up the information for setting a P0300. If I slow down to below 70 the check engine light will turn off. Dec 3, 2018 · Engine Misfire While Moving . The code is p0300 "random misfire" I have already changed the spark plugs, wires, ignition coil, ignition module, fuel pump, fuel filter, and air filter. It doesn’t seem to do it under full boost conditions. Apr 13, 2007 · The problem is that at cruising speed of around 2100 rpm I can feel and hear missing and popping sounds . Nov 13, 2018 · 3. It has 125,000 miles on it. Accelerating was great and it ran like a beast until 5th gear, 2900 rpm, 60 mph then it would bog down and lose power. Jun 22, 2017 · At any rate, the high speed misfire continued off and on, and when watching a video to determine cylinder numbering, I stumbled upon a tech who mentioned a plug gap of . Nov 15, 2013 · 2000 v70xc turbo AT, stutter, misfire? at highway speed Jump to Latest 728 views 1 reply 1 participant last post by adlerv70 Nov 15, 2013 Jan 9, 2014 · 2011 F150 FX4 with 3. This is a 1998 Subaru Legacy outback Funny thing is, the blinking CEL only pops up when RPMs are above 3k or at 70+mph . 1999 7. I recently purchased a 2003 Chev, 2500 HD, 6. P0301 Cylinder #1 Misfire. Before it is off, I have got the code. I’ve been fighting that code ever since. 7 and 10 speed transmission. Dangerous on busy freeway. My first thought is throttle position sensor. Jun 1, 2018 · At higher RPMs it seems stable and it’s mostly noticeable when driving slow in lower gears but is still noticeable even at highway speed. It had been a while and I was about due for plugs so I replaced all 8. Mar 3, 2011 · stumbled and bucked in top gear at highway speeds; fuel consumption very high -- about 12 mpg (18 to 22 normally) check engine codes for misfires on cyl 6; check engine codes for multiple random misfires; A check of spark plugs revealed cyl 6 plug wet with fuel, but all others looked okay. Sep 3, 2015 · The more common P0171/174 “lean” codes are typically caused at higher engine speeds by faulty data supplied through the engine coolant temperature (ECT), barometric pressure (Baro), throttle ­position (TP), mass air flow (MAF) and oxygen ­sensors (O2). 3 140,00 miles, all Ford OEM parts I do not use aftermarket. Getting up to highway speed is difficult and maintaining it is harder. I tried to reset the cruise, and it Feb 26, 2017 · Here is one comment: i am drive ability tech for gm gmc/buick dealership. 88, SOA lift with 2. In addition, when cruising at highway speeds, it runs fine, but anytime you have to lightly accelerate up a hill or something it starts again. P0306 Cylinder #6 Misfire. But I wouldnt take anyone's word for it. The most common situation where you will feel misfires is in high gear, low RPM, and with the gas pedal to the floor. Some say they dont go bad. I get same code P0300. A misfire happens when the combustion stroke of the air-fuel combination is unsuccessful. That's why I still don't quite get why the TB helped so much. Intermittent( some days it is less severe and or seems to be not at all). So I went about reading forums and such. Under heavy load part throttle up hills will produce the same misfire in OD. Small 1-2 second stutter/rumble strip feel. P0304 Cylinder #4 Misfire. If felt like it was choking out and would load up or miss but only at highway speeds. Live misfire count shows only #4 misfiring I replaced the throttle body and position sensor (along with the accelerator pedal w/position senor), and once the idle speed settled down it was still rough, and threw a P0305 code (cylinder 5 misfire). Has 145k on it - always maintained. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire. Apr 9, 2008 · Just bought myself a focus 2001 1. , to pass a car or to get up a particularly steep hill, we feel several big thuds or jerks, like the truck is misfiring. So I replaced 1&2 coils. The rear sensor seems ok. Jul 28, 2020 · 1. Feb 7, 2017 · Veh. cap, plugs, wires and egr valve. Last week I bought a new to me 81 F150 that has a dead misfire I am trying to track down with no luck. If you kept it out of over drive it usually wouldn't do it. 0L Eddie Bauer MAF/5 Speed Swapped - Misfire at Highway Speed - So to start I have done a MAF Swap, but instead of pulling the entire harness off the donor I just pulled out the injector wires as well as the MAF wires made an overlay harness and pinned them into the ECM Jan 29, 2006 · Dont have a clue anymore what it is. Again, if ANYONE has had these problems or if you have an idea, please let me know. . 2000 Feb 25, 2016 · Misfires related to fuel system issues are far more noticeable at idle or low-speed driving than they are at highway speeds. His would mostly start to do it at highway speeds once it got into over drive. I can't for the life of me track down this issue. Dec 6, 2008 · 1987 - 1996 F150 & Larger F-Series Trucks - 1996 F-150 misfiring at highway speeds - Hi guys, I have a 1996 F-150 with the 4. I ran by and had the codes pulled and i had P0300 twice and P0430. I live in a hilly city with a lot of very steep hills, but these misfires only happen on the highway when travelling in fourth and above at 80+kmh. While driving on the highway a strange noise keeps happening (not always) while under load around 70MPH. Usually no problem felt by the driver, just a blinking SES light. Nothing would ever fix it. My car starts jerking/shaking like it has trouble finding 3rd or 4th gear. Restricted exhaust. The problem only exists in the morning. Its always random misfire,no Nov 16, 2015 · The issues is at highway speeds under load the check engine light will flash. Next, hold engine speed steady at about 2500 rpm for 15 seconds and read the gauge. then a week later I decided to try the Highlander tune and the hesitation was so bad that I couldn't even get up to highway speeds and each misfire shook the truck. I had a random multiple missfire but I had no cats on my 06 Yukon 5. miles. 028. I reset the codes and replaced plugs with sp-580. Performed a… Jul 31, 2013 · Hi everyone, I got a 2010 5. At this point, any attempts to accelerate are met with even stronger shaking. A common misfire at highway speeds can often be caused by as something as simple as a partially clogged air or fuel filter. I'm thinking it could be a transmission torque mount or some other bushing or mount? Aug 25, 2020 · After the oil change I returned to MacGyver and the hesitation all but when away, for the most part. Scanner shows codes P0131, P0140, P0151, P0154, P0155, P0160, and P0300. 6 zetec. Poor fuel economy and reduced power or reluctance to really "go" or accelerate are symptoms too to some extent are also symptoms. the gm plugs come pregapped . The result is an engine that stumbles, idles roughly, and doesn't perform at 100% power. 4. Very much like OP described. May 20, 2005 · 6. The auto parts store said that was most likely an ignition coil or plugs. Would these have any effect on my erratic idle speed? It likes to bounce about 300 to 400 RPM randomly. Been slowly picking away at the minor issues, but this one has me stumped. P0300 "Multiple Cylinder Misfire" And also experienced the same symptoms, random misfire episodes and then it would run fine but it continued to get worse. Still, you need to find the source of the problem. 3 missing under load in 5th gear at highway speeds computer shows 1,3,5 missing and codes P0131 02 signal low bank 1 sensor 1 and 02 sensor high bank 1 sensor 2. I got on the I-10 and punched the throttle at 65 - sure enough, engine misfire. highway, up hills During road test CEL would flash around 75mph no hesitation, or stumble just a CEL flashing. Aug 29, 2016 · Well the verdict is in. Jun 16, 2010 · Egrs getting plug up with carbon is not caused by the egr not working. We tested exhaust and found good flow, no excessive back pressure. 0L with 120K miles is frequently giving me a P0307 code. Plug Wires: P0300 (random misfire) P030X(Where X = the misfiring cylinder) Nov 2, 2009 · 1997 - 2003 F150 - Missfire/studder while crusing at highway speeds? - I have a 97 f150 4. - Answered by a verified Saturn Mechanic Jan 8, 2011 · misfire/skip only at highway speed HELP! Jump to Latest 23K views 31 replies 11 participants last post by ToxicDoc Jan 14, 2011 Jan 20, 2018 · I sometimes notice it in lower gears at low speeds, and it happens on the highway for a couple seconds at a time pretty regularly if I'm cruising around 1,500 rpms. When cruising on flat highway, or going downhill, you would think nothing is wrong. 0 Vortec motor. Only just at low rpms under medium load. I will do it in other gears at low speed also, but once the speed has been built up, it goes fine. Mar 27, 2022 · 2015 - 2020 Ford F150 - Misfiring When Accelerating - We have a 2017 F150 2. 0, Misfire at Highway Speeds. Nov 11, 2018 · 2015 - 2020 Ford F150 - Shudder/misfire at highway speeds with 2017 3. Restarts and runs just fine until next time. Occured twice in 1000 mile trip. Dec 15, 2018 · In the case of a misfire a P0300 (random or multiple cylinder misfire), or specific cylinder P0301-P0306 should have triggered. Problems like lousy engine mounts will cost $200 to $600 to fix it. Fuel-system misfire symptoms will suddenly appear and are often more noticeable at idle than at highway speed. Mar 5, 2010 · 1997-2006 Expedition & Navigator - 2006 Expedition - Misfire, hesitation problem solved - Hey all, I have a heistation/misfire problem I finally solvedon my 2006 Expedition, 5. She says her jeep has power again. My TJ has an occasional cylinder 1 misfire indicated by the check engine light and an occasional lurch at highway speed. Trying to diagnose. Turns out it is going to be 2-3 days to get parts in to dealership and 2-3 days to install said parts. Mar 31, 2022 · If you notice your car misfire at a high RPM, it is a problem with the mix of fuel, air, and spark in the engine. Run fine at first but seems to have developed some sort of misfire. Had the codes read and started on the most logical and did new plugs, wires, distributor cap and rotor. Remvoed Distributer to check for end play, it checked out good. I have been having issues with my '96 Vulcan 800 and I am starting to run out of ideas. replacing sparks and wires made the engine run smoother but the hot start misfire still happens. 0 with a 118K on it. If I speed up to > 2000 RPM, the issue goes away. It was one of the weirdest misfire issues I have ever seen. So far the dealership has replaced a coil and all spark plugs, misfire no longer severe, but still present. 2000 SW2. Jan 16, 2014 · I had my cruise control on, set to about 71 or 72 mph, and had been driving for hours. Could this be a bad 02 sensor upstream causing this misfire? Picked up a 97 Chevy Tahoe back in March has 126k on the clock. Jul 26, 2020 · So even when the issue occurs it doesn’t throw a misfire code. In have changed the plugs, and ignition coils. Jul 24, 2024 · wow very informative! thank you! 2001 4runner v6 3. Jul 21, 2011 · It seems like the nature of the misfire would suggest injectors because the engine will smooth out if I am coasting (when fuel delivery is pretty slow) or accelerating (when increased fuel pressure can overcome any obstruction in the injector), it is only rough when running at a constant speed of around 55mph. I have a 2001 blazer 4. Aug 25, 2020 · I’m having a problem with my 2008 Speed 3. The technician also stated there was a stored trouble code for a #2 cylinder misfire - caused by a defective ignition coil (although there was no check-engine light on, or flashing). My Insight is showing no codes, my ICP pressure is 600 at idle and when cruising around 1200 or so. A few things I learned: Feb 23, 2016 · Over the past few days it's been doing it intermittently in first gear, in reverse, and at an idle. I pulled over and returned truck to stock. 4, with 66,000 miles. Dec 26, 2018 · 2009 - 2014 Ford F150 - 2013 5. Aug 24, 2019 · It usually occurs at highway speed (around 70 mph), under light acceleration (1500 rpm) and usually when going uphill. Occasionally I can go a few days without the check engine light coming on, at other times, it happens daily, and sometimes as much as 2 or 3 times in a day. Feb 20, 2017 · Acceleration was poor. 5L/AX-5/NP231 with SYE, Spartan locked Dana 30/Aussie locked Ford 8. The truck runs great and the light does not come on during normal driving. Jan 19, 2012 · Most apparent when coming up to speed on the highway or slight acceleration at highway speeds (>60 mph), engine revving between 2k to 3k rpm. Note the vacuum readings, and any fluctuations, at each speed. Aug 18, 2024 · Car Repair, Delivered. Misfire across almost all, if not all cylinders. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires. It happens at low RPM cruising (ex: 70 MPH on the highway for a sustained time period), or when the engine is under load like climbing a hill or that brief time period where you are accelerating hard but the transmission hasn't downshifted yet. But the rpms go up to 2500 or so and I can cruise at that speed ok. If a car shakes at high speeds, it shows an imminent problem in the vehicle. One or more misfire codes (P0300-P0308) will be stored in your pickup's PCM memory. When I plug it back in, it's nonstop cutting out at acceleration from a stop to running down the highway and everything in between. The problem seems to be getting progressively worst, ie, the engine seems to misfire only when decelerating, most noticeably at highway speed -not evident during acceleration or while coasting. Jan 23, 2014 · I've experienced the bucking at highway speeds, misfire under light load, particularly going up mild grades or big hills, happens when on cruise (or not). I've been having an issue with a shudder or jerking feeling when I'm on the interstate at higher speeds when accelerating between 1500-3000 rpm. It seems not to start untill it reaches normal operating temps. It is caused by carbon build up. Once I replaced the upstream, they both started bouncing around properly. In addition to the delayed shifting right after starting and the occasional shudder also right after starting, I also noticed some very slight shuddering right around 60-65 if I held constant throttle. When not quite enough air or fuel can get through at highway speeds, the vehicle will misfire. But at freeway speed and higher RPM, I would think it would clear up. Cylinder 1&2 misfire and when I first picked it up o2 stuck lean bank 1 sensor 1. Possible failing HEI module? 95 K2500 454 As the title states I am feeling a random misfire at about 60mph/2,000 rpm in my 95 K2500 454. Jul 13, 2017 · Can someone please help with what I should check next, I have a 1998 Chevy K1500 5. Sep 13, 2010 · well my 5. Even so, there is no audible noise or power loss when the li Sep 14, 2021 · I have a 2021 F-150 STX 4x4 with the 2. Jul 16, 2021 · You could also check the mass air flow sensor. Misses internimate at speeds worse if it is raining. Still continues to misfire. But stored up to 100+ misfires. After about a days worth of driving, the Jeep started running rough, and then has a violent vibration when the engine is underload. Eventually I had enough misfires to trigger a persistent Check Engine Light, so I brought it in to find that I had a P0302. Apr 30, 2019 · 2003 6. Highway driving was ok, but any attempt to accelerate or downshift was poor. However, when accelerating to highway speeds, you notice that the truck will intermittently jerk. These misfires often occur under load from the engine, such as when you accelerate quickly. They seem to be most prevalent when gradually accelerating to highway speed or decelerating from highway speed. Jul 12, 2016 · 1993 Wrangler S 2. Details on car 148000kms Jun 6, 2014 · My TJ is stock (1997, 5 speed, 4. Apr 5, 2019 · Hi! I have a 2016 Lincoln MKC AWD 2. I take it on the highway, the engine starts to See full list on mechanicsdiary. 5 EB (video) - Hi, Looks like I've experienced my first problem with my '17 F150. You will have a flat, but that doesn't mean you need a new tire unless it won't hold air. It was a frustrating process, so I figured I'd document it in case somebody along the line can get some use out of it. Sep 20, 2020 · 2004 Tj 4. The engine runs fine Dec 16, 2018 · Run the engine at idle, low cruise (1800 to 2200 rpm) and high cruise (2500 to 3000 rpm). hmmm still cleaning the TB, empty can of TB cleaner and thunder storms has delayed the progress a bit. g. Suddenly appearing misfire is usually not ignition related unless a plug got fouled, for what ever reason, so bad it won't fire. Truck develops a worsening shake while going up hills, if you keep in the throttle you will eventually hear misfire from inside, then setting off the check engine light. Feb 10, 2011 · Ford Taurus Engine Buck/Misfire at Freeway Speeds - 212 reports. Nov 1, 2019 · You should hear the misfire when revving the engine when your Sierra is parked. Random misfire at highway speeds, cap, rotor, plugs and wires are new. At idle and low RPM, I can understand the misfire as the truck is looking for the right mix. About a two months ago running on the highway at speeds between70-75 mph the bike would start to buck and jerk and actually cut off. (Freeze frame will show the code was set at highway speeds during slight decel or coasting. Feb 23, 2010 · It seems to misfire at sustained highway speeds of 65mph and above. If your engine is chugging at a stoplight but smooth at speed, take a hard look at the fuel system. Dec 18, 2014 · Slight misfire below 2500 RPM. Sorry for the length of this post, but I wanted to give you guys a full view of my problem. Usually a sign of misfire, poor spark, or fuel mixture. ampwgf dkithxom izh dxu doaqn yapq iug npvv ldka dya