BN Posted September 5, 2009 Report Posted September 5, 2009 My 93 Cutlass 4.3 seems to idle to high. When I start it up it goes to 1,500 and then comes down to 1,000. When driving down the street it seems to be at about 1,000 with foot off gas. Do I need to do the idle re-learn thing or is this something else? Quote
White93z34 Posted September 5, 2009 Report Posted September 5, 2009 how fast does it come down when you first start it up? honestly it sounds more or less about how the car should act. Quote
BN Posted September 5, 2009 Author Report Posted September 5, 2009 how fast does it come down when you first start it up? honestly it sounds more or less about how the car should act. Cmes down to about 1,000 Quote
White93z34 Posted September 5, 2009 Report Posted September 5, 2009 Any service engine soon lamp? how long does it stay at 1500 before settling to 1000? Quote
Andrew Posted September 5, 2009 Report Posted September 5, 2009 this sounds normal to me. Any engine should idle higher upon initial start-up. Quote
BN Posted September 6, 2009 Author Report Posted September 6, 2009 Any service engine soon lamp? how long does it stay at 1500 before settling to 1000? No service engine lamp. Doesn't stay at 1,500 very long. Maybe everything's ok. Most other cars I've had idle between 500-700? Quote
tunerlover3 Posted September 6, 2009 Report Posted September 6, 2009 Does this do it every time you start it or just when cold? It actually sounds normal, though its a little high after it warms up. Quote
RobertISaar Posted September 6, 2009 Report Posted September 6, 2009 its in the tune/code for it to SPECIFICALLY do this, its nothing odd... probably to prevent stalling/wandering idle... Quote
jman093 Posted September 6, 2009 Report Posted September 6, 2009 Ya, it will set a code if the idle speed isn't want the ECM wants to it be. Quote
19Cutlass94 Posted September 6, 2009 Report Posted September 6, 2009 My car will idle at 1200 until it warms up, then the idle comes down to about 800 Quote
RobertISaar Posted September 6, 2009 Report Posted September 6, 2009 yep. all completely normal. theres seperate tables in the BIN for park/neutral and drive for idle speeds.... BTW: 3.1s(LH0) DO NOT like an idle under 700RPM. i'm not sure where the breakpoint is for LQ1s.... Quote
BN Posted September 6, 2009 Author Report Posted September 6, 2009 I guess I won't worry about it then. Thanks for the help. Quote
BN Posted November 18, 2009 Author Report Posted November 18, 2009 This idle has been getting worse. When started it shoots up to 2000 - 2500 and then slowly comes down. I did the paperclip thing and it said idle control valve. I put on a new ICV and it's still the same. I thought maybe a vacuum leak but checked the whole thing with carb cleaner and didn't find anything. I though I'd see if you guys had any ideas before taking it into a repair shop. Quote
RobertISaar Posted November 18, 2009 Report Posted November 18, 2009 disconnect the battery and do an idle relearn... i bet it won't start up at such a high speed... Quote
BN Posted November 18, 2009 Author Report Posted November 18, 2009 Did an idle relearn and no go. It still runs like a runaway train? Quote
RobertISaar Posted November 18, 2009 Report Posted November 18, 2009 Did an idle relearn and no go. It still runs like a runaway train? then it's certainly a hardware issue. somehow the minimum IAC value creeped up in the GP to 48 a few days ago. did an idle relearn and it fixed it... Quote
mfewtrail Posted November 19, 2009 Report Posted November 19, 2009 This idle has been getting worse. When started it shoots up to 2000 - 2500 and then slowly comes down. I did the paperclip thing and it said idle control valve. I put on a new ICV and it's still the same. I thought maybe a vacuum leak but checked the whole thing with carb cleaner and didn't find anything. I though I'd see if you guys had any ideas before taking it into a repair shop. That really sounds like a vacuum leak to me. If the engine is idling higher than a specified RPM for "x" amount of time(I don't remember offhand), it will throw a code for the idle control circuit. Did you spray the cleaner around the intake manifold(s) as well as vacuum lines? Quote
BN Posted November 19, 2009 Author Report Posted November 19, 2009 I sprayed as many vacuum lines as I could reach. I'll do it again on the intake area. Quote
BN Posted December 2, 2009 Author Report Posted December 2, 2009 I took it to a mechanic and it ended up being a vacuum leak. He had a hard time pinpointing it so he ended up replacing alot of the vacuum lines and it solved the problem. Quote
mfewtrail Posted December 2, 2009 Report Posted December 2, 2009 I took it to a mechanic and it ended up being a vacuum leak. He had a hard time pinpointing it so he ended up replacing alot of the vacuum lines and it solved the problem. Good deal. Thanks for following up this thread with the solution to your problem. Quote
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