Question about 2000 Oldsmobile Alero

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The motor idles a little rough and stalls when gas is applied.Is this a idle control valve problem or a mass air flow problem?

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It looks like,both is possible.But is very expensive! Check first: Spark plugs worn or not gapped properly, Vacuum leaks, Uneven or low compression.....

Posted on Dec 12, 2009


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When I start My 1998 buick regal ls 3.8 it idles rough and stalls most of the time, the rpm's go up and down as soon as I let go of the key. If I step on gas for a few seconds it stays running. Motor

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Stalls out at stop signs and red lights. Couple of time while coasting. Hard to restart. Eventually does. Prior to stalling, RPM is low and oscillating slightly. Once, after restart, had no control on...

I would take it to your local shop and have them test the idle air control motor which is mounted on the top of the motor and also check the mass air flow meter located in the air intake system. If you can keep slight pressure on the gas pedal and the motor continues running, then I would first suspect the IAC as being the problem.

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Rough idle

Have you had the throttle valve cleaned?

Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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The car stalls at idle and when stopping.

Sounds to me like an O2 sensor, i had a similar problem with my Ford Probe GT. Luckily my car was a 5 speed so i just kept my foot on the gas a bit and put my car into neutral as i was slowing down or coming to a stop. If you're car is automatic I would not suggest doing neutral drops.. you'll cause more damage.

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