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. Gmc jimmy cranks up and does not idle but if I give it a little gas runs ok. What would be the cause?

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I think if you checked the sparking plugs and map sensors then check your distributer its maybe not delivering the current nedded to perform the spark to some of the cylinders

Posted on May 30, 2009

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94 jimmy.. have replaced almost everything.. smells like gas inside..all gas lines replaced..was running alot better then couldn't get it started almost like it flooded..starter fine..replacedall fuel...


i have a 1994 gmc jimmy 4.3l cpi. i could not pass the emission test.hard to start, spuddered, and smell of gas was strong. long story short, i replaced my spider injectors, good to go. $278 brand new from auto zone.

Jul 31, 2011 | 1994 GMC Jimmy

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Try cleaning the EGR, there common to carbon build up on the 95 JImmy's.

Mar 20, 2009 | 1995 GMC Jimmy

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Sounds like the cpi injector assembly. The fuel pressure regulator may be leaking. Or the poppet valves on the injectors may be sticking or shot. I replaced almost every part on my truck and that is what it ended up being the whole time. It's a common problem on these models. Hope this helped

Mar 01, 2009 | 1997 GMC Jimmy

1 Answer

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


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.

Feb 02, 2009 | 1994 GMC Jimmy

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check the temperature sensor for the computer. it may be telling the computer that the engine is still cold and causing the engine to run too rich at warmer temps

Jan 16, 2009 | 1994 GMC Jimmy

2 Answers

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I HAVE THE SAME JIMMY, HAD THE SAME PROBLEM, I REPLACED THE IGNITION SWITCH , THAT FIXED IT.

Dec 14, 2008 | 1991 GMC S-15 Jimmy

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Hard start when cold/first start in morning


The pressure relief valve is in the spider fuel injector not the fuel pump. We have had our 94 gmc jimmy for 4 years & have had to replace the fuel injector 4 times which cost right at $500 each time for the part. Yes the spider fuel injector cost averages around $500.

Nov 16, 2008 | 1994 GMC Jimmy

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