Question about 1991 Buick Regal

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I have a 1991 buick regal stalls and shut off after warming up

I have a 1991 buick regal with a 3.8l engine. My car starts up fine and drives well until it reaches operating temp at which time it stalls and shut off. after waiting for 1-1.5 hours it starts up and runs well but shuts off after a few minutes again. any suggestions?

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frank thomas wilson

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Egr valve is not opening up when the engine reaches it normal operating temperture

Posted on Feb 07, 2010

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Given the age of the car, I would also check the idle air control (IAC) and channels, the EGR valve and the throttle body for carbon buildup.

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Hi,
You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.
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