Question about Oldsmobile Alero

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How to I set idle speed?

I have a 2000 Olds Alero Quad 4. It runs great and has about 50,000 mixed miles. It has been serviced by the book.
My problem is that it has been getting poorer gas mileage that it shuld be. Maybe 25% worse than when it was newer. Even new air filters do not help.

My thoughts are that it is the idle speed setting is too fast,about 1,000 rpm.I want to try itat about 700 RPM. I can find the throttle cable that controls the air and fues but I cannot see a idle speed setting screw or other adjustment.

Can anyone help me to adjust the idle speed?



Posted by Kimo1 on


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Harvey N Tawatao

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Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay. CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Drive ability problems may exist until computer systems have completed a relearn cycle.
NOTE: Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not possible. After replacement of Idle Air Control (IAC) valve, system must be cycled as identified for PCM to properly control idle speed. If idle speed is not okay after cycling system, problem is usually caused by a dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.

Turn ignition on with engine off for 10 seconds. Turn ignition off for 10 seconds. Start engine and idle for 30 seconds. Slowly vary engine speed between idle and 3500 RPM 5 times. Return engine to idle. PCM will now properly control idle speed. 2.2L (Cavalier & Sunfire) & 2.4L (Alero, Cavalier, Grand Am & Sunfire)  Good luck and hope this helps. If it still has the high idle problem, your going to have to buy a can  if not two cans ot THROTTLE BODY CLEANER NOT CARBURATOR CLEANER. Just follow the instruction on the can and try to get the Idle Air Control Valve cleaned also which is on the sdie of the throttle body so go to town when cleaning the throttle body and then do the Idle speed relearn again. The other thing to is since your doing house cleaning, buy a MAF sensor cleaner and spray down your MAF sensor and IAT sensor also, this will help with your fuell consumption. 

Good luck and keep me posted, be glad to help.

Posted on Jul 04, 2009



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I have a 1996 2.2l . i changed the injectors on it and now all it wants to do is to rev to the moon

Posted on Mar 05, 2010


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