Question about 1991 Chevrolet S-10 Blazer

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Vehicle is used for mail delivery. outside temps in the 90s. two&half hours into delivery the engine stalls periodically. after few cranks it starts. temp gauge & radiator ok. oil pressure gauge is low. dip stick shows sufficient oil. after i let it set for one hour it ran without stalling.

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Clean your Throttle body with throttle body cleaner or Deep Creep made by Seafoam. When the carbon and varnish build up in your throttle body get's hot, it gums up the IAC (Idle air control) valve which help moderate your engine's rpm to keep it from stalling.
If the IAC is stuck due to the gum of the carbon and varnish in your throttle body, you have stalling issues which you have described. Start with that and replace your air cleaner filter since your going to clean your throttle body.
Good luck and be safe, thank you for using fixya and post us back.

Posted on Jul 07, 2010


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Engine dies

My wifes vehicle did that for about a year in hot weather also.
It was giving PCV valve codes, misfire coded, but finally after her insisting I was wrong, I replaced the fuel pump and fuel filter and it has been running fine ever since.
it would run great when it was cool, then when the outside temp rose into the 80s and 90s it would run about 30-40 minutes and just shut down. Let is set, it would run another half hour or so.
Yeah I understand your frustration, its hard to determine also , even with a gauge by the time you get things disconnected and hooked up, it checks out fine.

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