Question about 1991 GMC Safari

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91 4.3l 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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You have a TransMission Problem..It's Called a "Torque Converter Lock-up solenoid" ..

When the Engine is cool the solenoid is not being used,
When the Engine is Hot, the solenoid Kicks in and makes your Chevy Run like your pulling an 18 wheeler.

Wait till the Engine is Cool, Slide Under your Van, Drivers side near the shifter is a 4 wire Plug.
Un-plug the wire and see if your trans works after it's hot.. your just by-passing the solenoid BUT I have never found a use for it my self..

IF you still get Lock up after this, you are stuck bringing to a trans shop or see if the solenoid cam be removed without ripping the whole trans apart..

Posted on Feb 03, 2009

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