Lt1 high idle. 9/sbdt/fortnite-minecraft-map-download-pe.

LT1 High Idle. Come join the discussion about performance, specs, builds, conversions, swaps, modifications, troubleshooting, maintenance, and more! Aug 20, 2021 · PCM is switching from open to closed at 176 as viewed on scanner. Once all done i hooked everything back up, and my idle seems to stay at 900rpms. May 15, 2012 · C4 Tech/Performance - 93 LT1 High Idle - Have a persistant high idle issue on my 93 LT1 ZF6. Anyhow, I've read many different forums of what could cause a high idle, but let me explain my problem first (before I try anything else). Nov 29, 2012 · It's almost a sure bet the idle speed control motor (IAC, idle air control) is probably bad. Sep 3, 2008 · What should the normal idle RPM and oil pressure reading be for my '94 LT1 M6? To the best of my knowledge all the internal parts are stock and all I have added since I bought it have been bolt-ons. But at some point while i'm out driving, i'll let off the gas to coast and the car maintains speed Pop it in Neutral and the RPM is Sep 4, 2011 · Car starts with NO issues and drops idle to about 800-1000 rpm (cold start) quickly. Once at a stop, it is around 1,000 RPM then eventually settles down. Question 1 All of a sudden, the idle is way too high. Apr 16, 2003 · C4 Tech/Performance - Correct idle speed, LT1 - Can someone tell me what the correct idle speed is for an LT1? Mine is a 95 LT1, 6M. As warmed up, at speed - above 25 MPH - backing off the throttle and pushing in the clutch - the engine drops to 2000 RPM and stays there. Crank engine and check idle pressure. I drop down to ~1000rpm after warm up. Gave a little throttle and it woul run smooth at a normal idle Jun 28, 2012 · It doesn't matter where the idle screw is it will either idle way too high or will bog down and idle way too low but sometimes it will idle fine LT1, Hotcam, PRW 1. While you can adjust idle position with the screw, you will have to cut a hole in the Throttle Body gasket where it covers the hole to the adjusting screw. With a longer hose taped to windshield you could verify FP under driving load conditions. Show Printable Version; 09-12-2016 #1. Intake Air Temp sensor, unplugged displayed -40C and with the connector jumpered 304C. Should be at least 35 psi. TPS is reading 0-1% with at idle. Pulled vacuum hoses, the only one that increased the idle was the small hose connected to the throttle body on the passenger side. If the idle is too high (compared to the idle speed programmed in the PCM) , the PCM will try and close the IAC passage, by dropping the IAC counts. Jul 27, 2022 · The LT1's camshaft features 242 degrees of intake timing and 244 degrees of exhaust at 0. Remember to perform another TPS Autoset, whenever you adjust the idle speed screw on the throttle body. I know this is an old problem with 6 speed LT1 cars, but I have yet to find anybody that has an answer. So I pulled it into the garage. Jan 23, 2011 · Hey all. TPS and IAC have been replaced with no difference in the idle. Aug 1, 2017 · High engine temperature and poor lubrication will shorten the life of the engine. As soon as the light came on, the idle smoothed out. went with a stage 2 btr cam. If idle changes or if it works better, it's probably defective. Feb 6, 2016 · SOLVED! Sudden Engine Issue, rough idle, running rich LT1 (With video and datalog) See sig for build details (list of mods). Myersfw, tried that, no joy. 1995 Impala SS LT1 383 Stroker Daily Driver Sep 7, 2009 · well I have fought my high idle problem all year. 5. To decrease idle speed, the PCM commands the IAC valve pintle to extend. Show Printable Version; 05-02-2020 #1. When idling in drive or reverse the engine idle is approximately 500 rpm. 020 over speed pro pistons,comp custom cam,comp push rods,comp 1. 1992 Chevrolet Corvette LT1 idling at 2000 rpm in park and neutral, 211,000, LT1 350, Yes, new Idle air control valve Nov 23, 2013 · 1. I replaced the idle air valve and has run fine since then. I let it run for a bit then I "blipped" the gas and the idle got higher, let it run some more and it seems like it got higher still. If you have the big honking cam, you could be getting revision that is causing the split blm. Since I've had it, the engine has bogged down a bit when first put into gear (somewhat intermittent, may be tied to engine temp). Above 2,000 RPM it pushes about 45lbs or so, but at idle it lowers to about 18lbs. Mar 10, 2009 · With an aftermarket TB, it is a good idea to monitor the IAC counts when adjusting the throttle stop. 4. IAC May 29, 2015 · Recently I changed my oil pump and drive shaft. 010'', hand May 1, 2013 · 1. Well I went to drive it today, and whether it is cold or hot the idle is between 1200-1300 rpms. 64V in datamaster. Then when it hits a specific time frame idle climbs to approx 3000rpms and hangs there. Cammed cars normally higher. Nov 15, 2011 · C4 Tech/Performance - 1995 Base Idle Setting - Every search on how to do this yields non LT1 results. Thread Tools. 050 inch. 6. 73's and stall Jan 9, 2017 · Working on a 2016 Camaro LT1 with custom cam with 30% fuel lobe, long tubes and cats, a heartbeat with 90mm pulley, ZL1 in tank pump, and a rotofab intake. 8vdc, didn't try WOT as it was early Sunday morning. Not sure if you could get away with doing that. Mar 17, 2008 · The STOCK fan settings are high: 225* low speed, 235* high speed. It idles at around 1400-1500. As soon as I switched throttle bodies and kept the blades closed at idle, the idle went down and stayed steady. It would also hit 70 psi hot at 3k. Why would it be that far retarded? I have the stock knock sensor and module with longtube headers and a cam, but stock rockers. The idle surging will usually go from around 800 to 1500. k. Maybe this will solve my idle off idle issue. 3. In order to get the hose clamp off the passenger side I had to unplug two connector and some vaccum lines. I changed out the old rusty IAC valve motor and cars running good. LT1, OBD1, M6, high idle issue October 11th, 2009, 11:51 PM. Increasing overlap increases top-end power while reducing low-speed power and idle quality. Show 40 post(s) from this thread on one page. Lobe Separation: LSA is the number of degrees the intake and exhaust lobes are separated. The boat has high idle issues (1200 with correct timing 10deg BTDC), but we have retarded timing in order to get the idle down temporarily. the EGR can leak and the controlling solenoid gets damaged [plugged up]. when going to closed loop BLM goes to 16 and states "enable" yes, lt ft bank1 drops to 108 as does bank 2. Followed the forum's advice and replaced the IAC, cleaned the throttle body and set IAC according to the manual. however Jan 21, 2018 · intermittent high idle intermittent surging at idle Warmed up, slowing down for a stoplight or something, it does not want to idle down. To get my idle to go back down to normal, I have to shoot a quick rev where I take my foot of the Dec 15, 2010 · Just a little lt1. Also buy a fuel pressure tester. If it isn't surging at idle, the idle will still be very rough and the car shakes a bit. Allowing more air in at idle. Feb 20, 2014 · as coco said, closed pretty much all the way is a good place to start. The TPS voltage flickers between . This makes sense to me now. But basically my question is, how much oil pressure should my LT1 have? Aug 3, 2009 · High Idle. 49 and . 1 Attachment(s) LT1 High Idle. these need be replaced if Nov 25, 2008 · i've pulled all the vaccum lines off and plugged them and i'm still getting a high idle. Feb 18, 2012 · 97 LT1 6-speed - Sitting still, rev engine and throttle returns to idle (about 950 RPM) just fine. Probably applies for your year too. Also, the idle speed adjustment screw seems to be frozen or maybe has lock-tite on it. 6 nsa Pro mags, patriot golds, 42lb green tops, ARP bolts all around, canton 6qt pan, pacesetter coated long tubes backed by a magnaflow Sep 17, 2016 · The idle tables are supposed to be less than the high octane table so that if the computer (via idle adapt advance) adds timing it can increase engine output to increase idle RPM, or it can decrease timing to decrease engine output to lower idle RPM. Jun 27, 2016 · Just installed a Racetronix 255 fuel pump and harness because my old pump was not keeping up at WOT, changed fuel filter as well. '00 Safari SLE with '95 4bolt 355 LT1; decked . Apr 3, 2016 · C4 Tech/Performance - Another LT1 High Idle issue - Hello all, I have a 92 LT1. through the idle passages, which feed the cylinders evenly, and less through the front, which is very unbalanced. Sep 30, 2010 · A forum community dedicated to all LS1 and LT1 powered vehicles owners and enthusiasts. Now the idle has speed is up to 1500 to 2000 rpm and once in a while returns to normal speed. I will let y'all know my findings. My data files are saying i'm getting 35 Kpa for vaccum. Sep 12, 2016 · Thread: LT1 High Idle. Apr 19, 2013 · Tune should take care of that. I have not found a vacuum leak anywhere. When in reverse turning the wheel is prone to cause the engine rpm to jump way down then way up as it tries to adjust. I was told it was due to not enough air at idle, not too low a idle setting. I am measuring 20-21inHg (on vac gauge) reading from the EGR vac port, My MAP reading corresponds to this in datamaster, my TPS shows 0% at ~. Feb 2, 2008 · More lift equals more horsepower and torque but at the same time high lift can lead to more peaky torque curves. 2 hardend pushrods,pacesetter coated lt and ory,eld. 5vdc and also at WOT 4. I've got it on a custom built engine cradle with it's 8L90. and its getting old. View Profile View Forum Posts Private Message Fuel Injected! Join Date Sep 9, 2010 · I would pull that high volume out and slap a standard volume high pressure in it if it were me. The Corrlc corrections need to be changed as the transport delay from the exhaust port to the o2 sensor has gotten longer at lower engine speeds and slightly higher as engine rpm climbs. Here's a handy search engine for searching salvage yards for the parts you need. 94 camaro z28 stock lt1 hooker lts 3 inch exaust into flowmaster muffler, k&n cold air, msd opti, msd blaster coil, 3. MAP sensor at idle was about 1. anyone have any good ideas on where to go with this next? im Apr 21, 2009 · 94 Z28: 383 12. Apr 10, 2015 · Can you find a file sharing sight and post a datamaster log of just the idle. If IAC values are way high, the IAC is trying to let in more air to allow it to idle. Jump to Latest LT1 Hotcammed, Stage 1 shift kit, 3000 Rev-Max stall converter, Hooker super comp long tube headers, True dual exhaust ,CAI, 1. The old one has a hole straight thru where the IAC is located. Do I take to mechanic shop to read code?Help me out thx Apr 9, 2014 · I would replace the EGR and the controlling solenoid. When I took my Trans AM LT1 out for a spin today I noticed that my oil pressure was around 20psi at idle but also when I was accelerating it had around 20 psi. Reset IAC. C4 Tech/Performance - Help me with my LT1 high idle, out of ideas - Back story: I bought a 92 in July and have been slowly bringing it back to working order. 6 rrs,and lifters,cnc stock ported heads,Walbro 255,edelbrock ported air gap intake,58mm t/b,pacesetter Lts,Summit 2. 5vdc. Sep 16, 2013 · a reasonable vacuum leak (say a crack in a vac line) will cause high idle on startup and settle after a while, as long as the IAC still has room to do it. Other times it will turn over within a second or two even if the engine is warm. 6RRS, ported heads/intake bbk 52mm TB, scat rotating asem, flat tops, bbk headers, ORY, STB, LCARB, vigilante 2200 stall, 3:73s 2002 ss conversion and much much more If it has wheels or a skirt ive probably been in it! Sep 24, 2014 · Your high pulse widths at idle and your lean blm's can be caused by vacuum leaks, exhaust leaks, and a weak fuel system. I can put it in Jul 25, 2011 · The pcm controls the idle by changing the iac counts to adjust for different load factors, if the pcm is not doing its job, it could cause the idle surge you have. Maybe the throttle plate is not closing. Now its a fairly steady approximately 2000 rpm idle. I just had to replace the VAT module (ECM not re-programmed) and have had it back on the road a few days. Right now it idles at about 900 RPM which seems a little high to me. Brakes feel firm, no effect on idle or running when pressing brakes. With a melling pump and gm high pressure spring. 540. It also ran pig rich. Simultaneous readings of coolant temperature and idle RPM will address the idle speed issues you originally posted. Both are confirmed 1bar map sensors (039). Cold start is 70psi then driving it while still cold it pegged the stock gauge. Jump to Latest Also, before we ream the newby's, as far as I know, the only engine in any '94 Z28 is an LT1! Jim . a crank marking at top dead center,cam mark at bottom dead center)i was pretty confident with that being the proper procedure for assembling the timing chain and gears . Printable View. Mar 9, 2012 · With a scan tool hooked up & your Corvette running at idle, watch the IAC counts carefully on the data display. this system has no MAF. 08-26-2010, 07:24 PM. The only adjustment is idle control, and this is factory set. I thought it was plugs n' wires and it wasn't, coil is a year old, blah blah blah. 73, headers, Magnaflow, Moroso CAI, twin 58 tb, MSD, tb bypass, a/c delete (sold) Aug 11, 2019 · The 95 LT1 Z28 automatic convertible experienced high idle after a head gasket job. A note about larger cams/those of you in the market for a cam purely for that choppy idle E. I feel this is way too high. Aug 18, 2006 · My old throttle body was worn and air was able to get around the blades even when they were completely closed. Jan 11, 2014 · 357 LT1, comp 224/236. The engine’s carburetor is adjusted so that the engine operates most cleanly and efficiently at full throttle. From what I read, it should be around 650 in neutral and 550'ish-600 in gear. Engine>Idle>Torque>Limit Offset - bump up around 20% to give bigger window to get it running 1992 Chevrolet Corvette LT1 idling at 2000 rpm in park and neutral, 211,000, LT1 350, Yes, new Idle air control valve Aug 3, 2015 · Ok, I am at a lost on how to fix this problem. The car runs great and I am averaging about 21 MPG with it. Hello. List of some well-known/proven/most asked about camshafts options for your LT1/LT4 Dec 11, 2003 · New problem on LT1 - Today while sitting at a light I noticed the car seemed to have more of a lumpy idle, I thought it was cool or maybe my imagination until the service engine light came on. 545 1. AT. High idle is usually the result of unmetered air entering the engine -- a vacuum leak, defective idle air control (IAC) valve, or faulty throttle position sensor (TPS) are the usual suspects. I looked at my stock TB and new one and noticed only one difference. View Profile View Forum Posts Feb 24, 2017 · C4 Tech/Performance - Lt1 high idle after tb bypass - i just did the tb coolant bypass on my 93 lt1 auto. 2. Feb 22, 2021 · I also suggest buying a PC based oscilloscope to check the opti low & high res signals going to the PCM. Lloyd Elliott heads/intake/cam. It does not do this constantly, but I would say almost the majority of the time. Mar 14, 2009 · ive been chasing around a bad misfire/rich condition on my newly built lt1 for a while now. Current issues are idle dips too low when coming to a light and will stall if its fully warmed up. My car is an M6. Reving the engine off idle gradual up to 2,000RPM's, if the IAC is working correct, IAC counts will increase higher numerical. 2 liter V8 LT1 engine is produced by General Motors for use in performance vehicles and sports cars. May 15, 2022 · An intermittent issue with the coolant temp sensor could explain variations in idle speed, and explain the coolant fans suddenly turning on. Put the same AC/Delco filter (PF454, i think) and used Valvoline 10W-30 Syn-Power full synthetic oil. Is there an acceptable way of increasing the idle rpm slightly without computer mods? 5. Aug 6, 2019 · This has probably been beaten to death but here goes. The stepper motor drives a valve pintle which protrudes into a passage that bypasses the throttle plates. I'm a carburetor guy with no experience with computer-controlled engines. Hi, I've recently got a lt1 out of a 2018 Camaro and I plan to do a swap with it. I am hoping someone can help me out. org/epa-news --If you enjoyed be sure to leave a Jun 15, 2014 · aha - missing post 3rd SeptDear terminal_crazy, troutdog311 has just replied to a thread you have subscribed to entitled - Tuning Split BLM's - in the PCM tuning & Computer Diagnostics forum of LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums. I first checked for vacuum Thread: 1996 Camaro LT1 Torqhead 24x swap high idle issues. Jan 27, 2022 · excessive fuel trims at idle - goes back to both the above. the higher the iac counts the better, because usually that means more even air distrib. Thinking back mine started to have ruff idle but would clear at speeds. I have not tried putting it in gear because its on jackstands and I'm still working on the Sep 4, 2010 · View Full Version : 1993 LT1 High Idle Issue HELP! Deviant93Z. Dec 10, 2005 · My '37 Plymouth coupe runs a '94 'Vette 350 ci LT1/R400 using a Street & Performance harness. No apparent vacum leaks and already sprayed card cleaner around intake and throttle body with no Feb 4, 2010 · Back-probed the Throttle Position Sensor at idle . Replace IAC. No Codes. i also know that it has a bad intake gasket that leaks iol up front but not sure about air. Jun 25, 2007 · On OBD1 computers your block learn should be very near 128 and integrator varying from 124 to132. Pound for pound - the best LT1 cam on the market. valve did not close securely all the time. if you rev it up then it only goes down to 1800 and will not come down. I noticed that when my throttle sticks which is 90% of the time, there is a gap where the throttle spring is supposed to rest on the idle screw. That strange tri-lobe at the rear of the camshaft drives the direct-injection fuel pump. By Xenon in forum GM EFI Systems Sep 3, 2020 · The car also has some issues starting it usually will crank for 5 seconds or longer before turning over. 52mm TB Mar 12, 2010 · nitrous is like a slut you want hit it but your afraid of the aftermath, 94 z28,m6,1. By Xenon in forum GM EFI Systems Oct 20, 2007 · mines set to 775 in gear, 800 in park. after that the car ran great and idled great. View Profile View Forum Posts Private Message Fuel Injected! Join Date Jan 15, 2018 · Just got the car back a day or so ago and at first the idle was spot on perfect at 850rpm, but now that I am driving it more, especially on cold starts it idles below it which is caused by some pretty decent surging. This explains the idle speed screw/IAC Position % relationship that must be correctly set for proper idle control. at Jan 19, 2012 · The issue I'm having is the idle sticking around 2000 rpm's when I let off the gas. But it usually traces to the engine getting way too much air. At first, idles around 1,5k, rev to 2k, 2. You can take it out and clean it, make sure the passages (plunger and seat) are clean. at idle when vacuum is high MAP voltage is low. Lets start with vacuum leaks. 5:1 forged 4340 crank, forged H beam rods, forged -5cc Mahle pistons, H series bearings all around, B&M flex plate, keyed hub, LE2 heads, custom LE grind, LE ported intake, BBK 58mm, LS7 lifters, comp hi-tech push rods, 1. By Xenon in forum GM EFI Systems The LT1’s camshaft features 242 degrees of intake timing and 244 degrees of exhaust at 0. Car starts fine. We tried a different map sensor with same results. I've got it running, although having very little experience with this engine, but it seems like it's missing when it idles. Have you checked your fuel injectors for proper spray pattern as a clogged injector or 2 on one side can mess with fuel trim. g. kept thinking i need to get back into the tuner to have it sorted out. 96 and 97 with the oil cooler still had a spot to place a sending unit, and that's where I put it. 6 rr,riased guide plates,moroso cai,airfoil,jet babyback,7. It goes and comes but I would say 90% of the time the idle is surging (meaning bouncing up and down). I just replaced my EGR had backfire thru the intake. Nov 22, 2007 · my lt1 seems to want to idle around 1300-1500 rpms. the other main reason you get poor idle is PCV and all the hoses. Got a chance today and decided to change the oil and filter. Now my engine is upgraded and the idle is a little low. Jul 21, 2016 · It is like the computer is not responding to the high idle. Actually 900 and drops 100 when I smach the steering wheel, eitherway a bit too high. Also if both opti low & high res signals are lost, no code will be set. Need the complete Cam Install Package? Apr 2, 2014 · 110k, Bright Red, Hard top, Moroso cold air, Trick flow ceramic intake elbow, SLP 3" Y pipe, Random tech high flow cat, Borla adjustable cat back with DHM cutout, MSD 8. my obd 11 scanner doesn't read the 1995. I have replaced all ignition and fuel system components, including: Optispark, Ignition Wires, Spark Plugs, ICM, Coil, Fuel Pump, Fuel Filter, and verified each and every fuel injector is operating properly. Mar 25, 2003 · DTC P0507 Idle Speed High Circuit Description The Idle Air Control valve is a PCM controlled stepper motor located on the throttle body. Could this be air idle valve again. This happened suddenly without any harsh driving, hitting anything, nothing. 5mm plug wires, Summit polished diff cover, March crank pulley, V8 shock tower brace, core shifter/billet hurst, Sway bars, Hotchkis lower control arms, welded subframe connectors, lakewood drive shaft loop, non cracked dash Mar 1, 2023 · Ensure the idle speed screw on throttle body, is adjusted to achieve an IAC Position of about 2-5% at hot idle. -Air Pump, EGR, Cats, EVAP Canisters deleted (legallisch in Arkansas)-miss is very prominent over 3k plus but you can hear it throughout the powerband, here is a quick video of the car cold. I got an ALDL cable to check Apr 14, 2015 · -1995 Z28 (132k) with a 94 corvette LT1 (32k) mated to a T56 w/stage 3 clutch (5k), skip shift elim. Oct 3, 2010 · 4th Gen (1993-97) Camaro and Firebird Tech Apr 30, 2024 · LT1 High Idle. k20chevy. Where the intake rubber elbow goes into the throttle body is a common one. Finally found someone who could read OBD I and discovered one O2 sensor died. Is this normal idle rpm? 2. Also I don't have access to a scan tool at this time. I can't feel a miss but can still hear the exhaust make a slight "pop" occasionally at idle. By ReidB in forum GM EFI Systems Replies: 27 Last Post: 09-26-2016, 05:00 AM. Stock values are normally in the 20-30 range at hot idle. The oilpressure meter does move but it seems a to be a little sticky. Is there anyway to adjust the shift points? 6. Somewhere around 25 to 55 counts for the IAC with the engine fully warmed & at idle is normal. Dec 30, 2013 · Once O2 prob is fixed we can look into the IAC, it's working , but some flaky high readings, it's at 160 trying to speed up the idle to 1200 (scan9495 actuator setting) but can't get there. any ideas would be appreciated. Do these cars have a built in rev limiter? Jul 5, 2014 · Guys, I want to run the symptoms by you, and see if we are thinking the same thing here. Aug 16, 2008 · the same thing happened to me except that when my engine was cold it would idle fine and run awesome but once it warmed up it would idle high and get really hot really fast 94 Z28 hardtop, A4, 3. In open loop blm at 119 degrees was 18 and lt ft bank 1 was 128, lt ft bank 2 was 128. bmr extreme tourqe arm, bmr cromoly lca's and panhard Dec 23, 2014 · My cooling fans do not run on high speed when sitting at idle and the temperature rises above normal. Dec 14, 2010 · Did get a slight pick up in idle (950 to 975) by spraying egr, which I replaced with intake on car previously, but nothing significant. Jan 2, 2012 · Now she idles at 850-875 with a target of 800. Maybe the IAC valve is stuck open. Plus good tune will alter timing to match cam power curve will improve performance. I got an ALDL cable to check Feb 29, 2016 · need some advise, i have a '00 trans am, has the ls6 intake, had a cam installed last summer and tuned. I could even see the black soot on one exhaust. The idle was so rough that the car would sputter and die or level out around 300rpm. Take a close look at the PCV hoses on the passenger side of the throttle body, if that appears fine then check out the components on the throttle body. 6 GMPP The LT1 doesn’t have open loop idle settings, however you can cheat using the PE tables. It runs semi smooth but keeps kicking and making a pop noise out the exhaust. Jun 23, 2010 · I had a high idle at park and my car would stumble and stall when stopped in drive at a stop light. Nov 11, 2014 · Hasn't changed much still is low when at warm idle. I go to start it the next day, and it won't idle. Base Tune Changes made for cam Engine>Idle>RPM - added 200 to Base, Rolling, P/N, In Gear (may lower a little when tuning). the rubber portion gets damaged. Now if you are sitting in idle, no airflow, that is what the coolant temp will get to before fans are commanded on, roughly about 3/4 up on the temp gauge, give or take. All was fine until I came to a stop at a light and the engine damn near died. The lower the LSA, the increased the overlap. 40 psi at idle hot. The car idled low, almost dying when throttle lifted due to potential vacuum leaks. Mostly noticeable in 5th and 6th at low RPM with a high load. Dec 2, 2012 · C4 Tech/Performance - 1993 high idle - I just got done doing opti and waterpump after bleeding the cooling system I fired up the car. injector values incorrectly set). . Any advice on getting it to Dec 21, 2010 · C4 Tech/Performance - Help me with my LT1 high idle, out of ideas - Back story: I bought a 92 in July and have been slowly bringing it back to working order. I have done the following: I investigated for an intake leak, and didn't find one -- I replaced the intake gaskets again for good measure and torqued everything down to spec. open up ur program and look at the injector bank assignment and post ur order I can check it tomorrow when I get to my shop. Is that correct? Thanks again y'all. Page 1 of 2 1 2 Last. It does a little better with a load on it in gear but still isn't right- jerks and what not. I had to feather the pedal to keep idle. If at all possible start log when just started up and cold (in open loop) and let it idle for at least 5-10 mins to enter closed loop and then get up to 180* F (about 80*C) . when originaly assembled i aligned the timing marks on the cam and crank pointing toward each other in the middle(a. If the idle speed is lower than programmed, it will increase the counts. (this forum does not allow attachments). The problem I am having is my fuel pressure reads 51psi at prime, 50 to 51 at idle, and when I disconnect the vacuum to regulator the pressure goes up to 54psi, then when I shut the engine off, I loose all pressure in a few minutes. When I had it out the other day it would idle at 800-900 RPMs, would carry 30-40lbs of oil pressure even cruising 60-65MPH in 6th gear (1400-1500 Apr 20, 2014 · The lt1 and the ls with the 411 PCM use a different firing order I was able to start my car off a stock 02 ls1 calibration and idle fine with a heavily modified lt1. The commanded IAC counts will just sit where ever the end up and not come down to bring the idle down. Now at warm idle, the pressure never drops below 30psi bumps up to 60 when cruising at 60mph (2000 rpm). At idle pressure should be at least in mid 30's psi. sdt cat back,2000 camaro rear with 4. '95 Stock Lt1 with 67,000 miles. We checked the reference voltages and grounds at the appropriate wires of each connector. Also keep in mind that opti low & high resolution codes don't light the check engine light. Since I can remember engine has had intermittent higher-than-normal idle on a hot engine after cold start; around 900 rpm when hot. It tried idling at under 500 and stalled. 0 Jul 28, 2015 · High idle after tune. Feb 21, 2014 · I know you said that you checked the vacuum lines, but the most common cause of a high idle like that on a fuel injected engine is some kind of vacuum/air leak. 5 x-pipe with dynomax bullets,march underdrive pulleys,gm opti,msd cap and rotor,Msd 6AL,Moore 10mm race wires,SLP line lock,SLP fan switch,aluminum D/S,Built 4l60e,TCI 3,000 stall,B Apr 21, 2010 · This is from the 1994 GM Factory Serive Manual, Book 2: IDLE AIR CONTROL (IAC) VALVE Remove or Disconnect 1. Seems to me you still need to close the throttle blades, letting in less air. Throttle response and blips of the throttle is NO problem for the first 15-30 seconds. These type EGR valves go bad after 10 years. Only problem I have is the idle. :thumbsup:. I believe people experiencing that problem have enlarged the idle air passage to help. Throttle body bolts were found loose, causing air intake issues. It does not matter how high I set it with the laptop, it still starts to surge after sitting in idle for a bit. 6, 11:1, Ported Heads, T56, 3:23, Pro5. Electrical connector from IAC valve. your MAP sensor should be about 8 to 9 "vacuum with stock cam. When it first cranking it ran smooth until it tried to settle down to an idle. Plus stall gets rid of sluggish take off waiting for RPM's to get high enough to make the cam happy. Apr 30, 2024 · LT1 High Idle. Jul 19, 2017 · 95 lt1 FWIW I blocked off the EGR on mine but it was in a '33 Willys. Jun 12, 2013 · I just figured out (well hopefully) my idle issue. The IAC cannot gain control of idle. Runs fine. that's because on initial startup, it's running a fixed amount of steps, and doesn't immediately start closing the iac and correcting for RPM. Basic high-level overview of camshaft specs D. Or service engine soon light, depending on which your car has. Should be around 43 psi. i went over the whole motor for vacuum leaks and found nothin. "Packaging the LT1 engine's intake manifold beneath a hood that drivers could see out of cramped the intake runners, forcing the number seven and eight runners considerably shorter than others. Jun 16, 2005 · All other sensors are the same as the '92/'93 LT1's, except that the Throttle Position Sensor (TPS) is no longer adjustable. Given my car has mods and previous owner bored throrttle body and messed with throttle plate stop screw I need to put it back right. So if you know me from other LT1 forums, you probably already know the scoop, but if not, here's the problem: I had a 2+ cylinder misfire in my LT1 in a 1995 Z28 A4. Stock. It's about $70 on ebay, amazon, etc. This weekend I blew apart the throttle body and found nothing to indicate a leak. These cams have become the benchmark for 6th Gen Camaro's / C7 Corvette's around the country. Just a high idle. Now it will still idle high after being driven, but if i Jan 22, 2017 · If got an interesting case hear (1994 z28 6mt) car loves to idle high! First start of the day ( second attempt car Nevers starts first try starts second try effortlessly) car idles at 1500 rpm and won't go down no matter how long I sit their !maybe it will drop like 100-200 rpm if I'm Lucky. Idles at around 800 to 900. Also if driven when cold - no issue. But at some point while i'm out driving, i'll let off the gas to coast and the car maintains speed Pop it in Neutral and the RPM is high idle issue IAC is good, wondering if its a vaccum problem. I have a 1997 Camaro SS LT1 that is experiencing rough idle/stalling problems and various electrical issues. Based on LS7 specs, the LT1 features new high rocker ratio and splayed valve geometry. May have some cam surge, depends how good the tune is as well as stall size/gearing. Apr 28, 2010 · C4 Tech/Performance - LT1 Idle is too high1993 - Hey Guys. Searched for vacuum leaks. 5k, 3k, 4k. If it's set too high or too low to begin with it gets tough for this work properly. Jan 11, 2011 · Just a little lt1. May 10, 2008 · It was my understanding that the LT1 had a primary location for the sensor/resistor behind the intake manifold driver's side, but had a secondary location above the filter from 92-95. Here are the troubleshooting steps. could tps sensor be bad?service engine light come on. Customer: My 1994 Z28 LT1, 55,000 miles had a Idle problem last year 2-20-08 intermitant jump in RPM from mormal 750 rpm up to about 2000 rpm. Sep 18, 2012 · LT1 Smoke on Idle Jump to Latest 7K views 10 replies 6 participants last post by shoebox Dec 8, 2012 Jan 27, 2008 · The scanner will show you the number of steps or "counts" that the motor has opened the idle air passage. I have a 68 Nova I installed an LT1 out of a 96 Caddy in. If you find a used computer from a similar car, lt1 camaro or firbird, with the same transmission. it has an aftermarket throttle body and the nitrous wires into my tps . 95 Formula soon to be 4-bolt main 383 LT1. Mar 13, 2009 · One day, I drive the car home and park it. Oct 12, 2012 · LT1 stays in high idle in park,but good in drive mode. Hook it up to fuel rail shrader valve and check key on prime fuel pressure. sema. It seems to me like a Oct 2, 2011 · 1995 Camaro LT1/T56 high idle! Jump to Latest 2K views 4 replies 3 participants last post by Mystery Bird Oct 4, 2011 Apr 3, 2009 · Automatics require high-stall converters and gears and 6-speeds require steep gearing to run this cam successfully. IMO your going to want a stall after you get tired of using a heavy foot on the brake to hold it back at stops. Would this hesitation (or soft low end off idle) be normal? 3. Feb 11, 2017 · Are you/lt1 map sensors comparable with ls1 map sensors? Offsets any different? At idle he's around 40-50kpa but at cruise with hardly any throttle he is at 80-90kpa. Still it is idling high. 1995 454 High idle. 03 raptor that'll pull your arms out of their sockets 97 WS6 Firebird (full drivetrain swap), edelbrock headers and full exhaust, custom pcm tune, throttle body coolant bypass, b&m shift kit, lt4 hot cam, bald tires. Mar 27, 2012 · C4 Tech/Performance - LT4 High Idle Problem - Ok car runs fine otherwise no performance issues or CEL. Clean throttle body and replace all 3 gaskets. sounds great and runs amazing besides the high idle issue Feb 18, 2000 · 1994 Camaro Z-28 High Idle Problem. update: 700-750 recommended idle for this cam. Oct 10, 2011 · At first the idle was okay, maybe a touch high and slightly shakey. . thank you Bill The 6. It is part of GM’s Gen V Small Block engine family and was first introduced in the C7 Jun 7, 2017 · C. If I turn the AC on the idle drops 200 rpm. The car ran perfectly fine when I parked it. I replaced the IAC. Then my sensor started to take a dump when hot. 5 x-pipe with dynomax bullets,march underdrive pulleys,gm opti,msd cap and rotor,Msd 6AL,Moore 10mm race wires,SLP line lock,SLP fan switch,aluminum D/S,Built 4l60e,TCI 3,000 stall,B May 1, 2013 · C4 Tech/Performance - 1994 LT1 Corvette With High Idle - Need additional Solutions, HELP!!!! - Hello everyone and thanks for taking the time to read my post :). I have to really hit the brakes to stop it. Only time will tell. Though if counts at 0 and you're idling at 1600rpm, sounds like something else is wrong like vacuum leak or tuned too lean (e. Based on LS7 specs, the LT1 engine features a new high rocker ratio and splayed valve geometry. Mar 25, 2010 · Sitting at idle, my timing was around 20 degrees retarded, and if I brought the RPM's up it got worse, as high as -35 or so. Apr 19, 2020 · This is from Motortrend, but not the article I read that referenced it's effect on idle quality. Jan 28, 2010 · Everything else seems to check out. Mar 28, 2009 · What is the normal oil pressure at an idle for a LT1? It has 60,000k, 10W-30 conventional Valvoline oil, and no major engine mods. Remember there are two PE tables, rpm and temperature, make sure they both correspond to your desired settings. Pass Emissions?: No Shift Point for Maximum Performance: 6400+rpm Idle Characteristics: Choppy Idle M6; Require Gears?: Yes Jan 10, 2011 · i have a 94 lt1 with AFR 180cc heads, ported intake and cc305, shorty headers i have leaned out PE mode to 13:1 and added 3 degrees across the tables for timing and idle at 30 degrees when i reprogram my pcm it takes a while for the idle to return to 800 rpm i noticed the iac position is too low and mass air flow dives to 5 or so grams per Sep 13, 2016 · for 93 lt1, TECH 1 or equivalent tool can manually control. C4 Tech/Performance - Another LT1 High Idle issue - Hello all, I have a 92 LT1. But the fact the idle speed varies may be related to other problems. thought it was fixed once but it came back. Ensure PE activation around your idle speed happens at 0% TPS, and then use your low RPM PE table to affect idle fuel mixture. This caused the idle to be a little uneven, and often too high. Mar 11, 2022 · The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 - If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too. Car is a '94 Formula LT1/T56. Would changing the rockers require me to have the PCM recalibrated? 4. Any suggestions? Jun 26, 2004 · C4 Tech/Performance - 92 LT1 - High Idle after IAC Replacement - I was experiencing a high idle (2,000 rpm) after the car was driven for a bit. It should be closer to 0, but the car is idling at 1500rpm. Mar 28, 2007 · 6,7,8,9. If RPM is higher than expected, it likely means too much air is getting in and the IAC is going fully closed and idle is still too high. Just smooth cruising in cool (85 degree) dry weather. One day I was Nov 28, 2007 · As it is now, it runs like a striped ass ape, and shifts about 6 grand wot, its just that damned high idle. however Mar 16, 2021 · Normal fuel pressure at key on prime should be around 43 psi. Jump to page: 09-12-2016. Feb 27, 2024 · On a cammed lt1 using the 8051 ecm, and running headers set the individual fueling values to 1 in both idle and off idle. 10,17x10 and 17x11 1/2 torqe thrust, slotted and crossdrilled on all corners, brigth red with hard top. Jul 16, 2018 · Hi, My father build a custom wooden boat with a 95-97 Indmar LT1 TBI out of mastercraft prostar. I had the tuning redone by MadTuner as I am running a 95 computer, harness and sensors. Feb 3, 2012 · Pressure on a '94 engine setup s/b high 30's at idle and vacuum to the FP regulator, then pull the vacuum line (simulates lo/no vac @ WOT) and pressure should rise about 5 lbs. Mar 5, 2022 · Thank you all for tuning in to another video!SIGN THE RPM ACT TO HELP SAVE OUR RACECARS!!-- https://www. The desired idle is high around 900 in places, but may be because of the cold coolant temps. Operating outside or below the optimum speed range for the engine and carburetor produces less power. Again, being able to monitor the IAC would tell you all you need to know and which Oct 2, 2011 · My 1995 Camaro LT1/T56 combo transplant in a 1984 Jaguar xj6 is suffering from high idle. 23 gears, rare red Apr 30, 2014 · Especially a long duration high lift cam. Well after getting my transmission done, I drove her home and parked her. Throttle is crisp and responsive when I tap the pedal. when i first got the cam installed and tuned i had an idle issue, car needed gas pedal feathered for about 5-10 seconds to get it to idle. closed loop st ft b1 fluctuated between 126 and 203 and b2 68 and Feb 9, 2015 · It idles high between 1250-1500. No issues technically. if integrator is lower it is adding fuel and if integrator is higher it is subtracting fuel. whats happening start up cold or hot and it idles up to 1500 then ses comes on and then goes up to 1700 rpm. computer interprets MAP values backwards. 59, causing the TPS % to toggle between 0 and 3 percent. ReidB. pbvbp whm wjjv gpfyl lpacjd nrb maykxce kfjqh nxwrer eylnh