Question about 1994 GMC Jimmy

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1994 GMC Jimmy hard to start and runs rough when first started

Have a 1994 GMC S-15 Jimmy with CPI have replaced plug wires, fuel filter, TPS, MAP sensor and EGR valve. Starts great one time, then immediately trying to start it again will hit one time, then just turn and wont fire. Holding the gas pedal down, it will fire and sounds like it is running on half the cylinders. After a minute it will idle normally. After warming up some it will sometimes surge and hesitate when opening the throttle.

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  • ah_3908 Apr 06, 2009

    I have the same problem, but most of the time its only hard to start when the engine is hot. Have not replaced any thing yet, have code 32(EGR) and a code 45 (O2 sensor)

  • dimechj May 13, 2009

    I have a similar problem with a 1995 Jimmy.Starts okay when cold and runs okay until the engine reaches operating temp and I shut it off.When I try to restart,the engine cranks for a while before it starts and then the engine surges and eventually smooths out.There are no engine codes.

  • Anonymous Mar 26, 2014

    when I step on the gas ,it slows down and then starts surging, if I let up on the gas it will smooth out ?

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Did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.

Posted on Feb 02, 2009

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1 Answer

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1994 GMC Jimmy hard to start and runs rough when first started


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