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#1
01-31-2009, 02:24 PM
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91 4.3 won't run hot.
I have a 91 astro 4.3 tbi. Starts and runs perfect. When up to temp cuts-out, hesitates and dies. I can keep it running by feathering the throttle constantly and putting it in neutral and revving the engine. If i stop and let engine completely cool off, runs perfect again. Until hot. Any help?.
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#2
03-15-2009, 12:24 AM
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Re: 91 4.3 won't run hot.
I am having the exact same problem with my 1991 GMC Jimmy 4.3 TBI
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#3
03-25-2009, 09:30 PM
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Re: 91 4.3 won't run hot.
I had the same problem with mine found a plugged cat. To test remove an upstream O2 sensor if it runs well when hot then the exhaust is restricted.
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