Question about 1999 GMC Jimmy

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It turns over like its out of gas but it has more than a half of

The truck runs fine until the engine warms up, then you turn it off and it turns over like its out gas but its firing

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  • 79 Answers

It is dieseling, there is an air leak in the intake circuitry allowing the motor to get enough fuel/air to run using the hot carbon or metal in the compression chamber to act like a spark plug.
If it's carbureted adjust the idle screw, if it's injected there is a faulty injector or sensor.

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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The engine runs fine until it get to half a tank of gas.


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