Question about 1994 GMC Jimmy

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Hard start when cold/first start in morning

When starting the GMC 1994 S-15 Jimmy it cranks but does not start. after awile it stars and runs. when it rund there is no miss and no hesitation. let it set overnight and it has the same problem again

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  • Anonymous Nov 20, 2008

    we are having the same problem till the fuel pump went out of it a few days ago.

  • Steve Brown Nov 26, 2008

    The noise dampener was leaking back through it. The part costs about $80.00. I put a piece of fuel line hose on it and it workd fine

  • Anonymous Jan 14, 2009

    I have a 94 jimmy where it has a hard time starting after it has gotten cold also. i thought it might be the battery so i replaced it but it still doesnt start. Itll turn over but not catch but itll start when someone jumps it off. do you think it's the fuel valve or injector?

  • Anonymous Mar 23, 2014

    vehicle cranks up but will not stay on but for about 1 to 2 seconds. It only stars when you put starting fluid in the TBI mouth.

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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.

Posted on Nov 26, 2008

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This kind of problem is most often caused by a failed check valve in the electric fuel pump, the lines and filter drain after setting and cause very long start/crank times, the check valve is part of the fuel pump in the gas tank.

Posted on Nov 16, 2008

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1 Answer

I have a 1999 GMC jimmy 4 door 4x4 v6 4.3 ltr automatic with a starting problem, it starts with starting fluid and runs great afterwards can drive all over God's creation afterwards, but day a


Sounds like you are loosing fuel pressure overnight. Since it takes 70+ psi to start and run, if you have zero pressure in the morning, it would take a long time of cranking to get the pressure back up.
If it is low or no pressure, the problem could be a faulty check valve in the fuel pump.

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jeeps are known for being hard to crank when cold so this is very normal!

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check to see if the starter clicks when you try it...you could go on the starter and cross the two posts and see if it trys to start. if it does not even do any thing than your starter is bad... i would think that your starter is probably out now cuz you have had to crank it over so much to get it running,.. and as far as it not starting i would change the plugs wires cap and rotor.

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1 Answer

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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

May 30, 2009 | 1994 GMC Jimmy

1 Answer

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Check the power to the cold start injector. (it's only going to have fire for a few sec. after the key is turned on). If the fire is good, replace the cold start injector. This injector is activated for a few seconds when the engen temp is low to add a little fuel lower down in the intake and closer to the pistons.

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My 98 Jimmy runs on synthetic oil and starts well after sitting in cold weather. If the weather is the problem, try checking that. If it is warm... sorry no ideas.

Dec 02, 2008 | 1998 GMC Jimmy

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The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.

Oct 27, 2008 | 2000 GMC Jimmy

1 Answer

1998 GMC JIMMY


a tune up would be the first step; plugs wires and fuel filter. then try a new rotor cap and button. if there still is a problem then check and see what you are getting for fuel pressure.

Oct 16, 2008 | 1998 GMC Jimmy

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