Question about 1991 GMC S-15 Jimmy

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We have a 1991 gmc jimmy we want to know what would cause the fuel enjectors to not fire on cold start. but we prime the motor with a little gas the motor will start and the injector will start spraying and the motor will run fine till you turn it off .then it wont start again till you do the whole prosess again

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I used injector cleaner additive to my gas tank and two full tank fill ups of premium gas, now no more studdering or any kind of hesitation at the traffic lights. I would recommend cleaning out the fuel supply system.

Posted on Feb 25, 2015

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Try changing the fuel pump relay and checking for power to the relay. I believe that there is an oil pressure switch that will supply power to the pump after the engine is running, but the relay provides power during start up.

Posted on Jan 31, 2010

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It sounds like an air lock or a fuel pump issue. firstly get the filter changed and bled through this might help. if the problem persists check the pump.

Regards

Dan

Posted on Jan 31, 2010

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1 Answer

1999 GMC Jimmy won't start. Tried adding little gas into butterfly at air intake. Sounds like trying to fire a little. I took the distributer cap off. Cleaned contacts. Still won't start.


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