Question about 1999 GMC Jimmy

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Best Spark plugs for a 1993 GMC Jimmy SLE Vortec V6 - Fuel Economy help!

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AC 41803 Drivetrain:Four Wheel Drive;
@Gap .045" This is a Platinum High Performance Spark PLug


Option : ASP AR25
EngineVIN:W;
@Gap .045"@ High Performance

Stay away from those Gimmick Spark Plugs , they are just more money for nothing. A good platinum spark plug is all you need, the key is to gap it correctly to your application...

On GM products Vin # W it is .045 plug gap
On Gm products Vin # Z it is .035 plug gap

You will not have huge gains in fuel mileage from replacing spark plugs except to say that if your old ones are just extremely bad, there is no magical spark plug with extra mileage manufactured into it.... Hope this helps...

Posted on Aug 24, 2009

Testimonial: "Thanks for the reply. Spark plugs are pretty basic, but I would have fallen for the higher end. Assume I have VIN W as there is no Z in the vin number"

  • Jeff Phillips
    Jeff Phillips Aug 25, 2009

    Glad to be of help, ask away in the future, always happy to help...

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1 Answer

I've got a 1994 GMC Jimmy 4.3 vortec v6. The truck


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IS THEIR WATER IN THE OIL? CHECK THE PLUGS TO SEE IF THEIR WET.YOU MIGHT PUT SOME PLUGS IN IT IF WET TO SEE IF IT WILL RUN.THEN PUT SOME HEADGASKETS ON IT.BUT IN REALITY NEW MOTOR WOULD BE BEST.

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My jimmy wont start have 58 psi of fuel pressure good spark but the spider injection wont open to spary the fuel brand new 280 bucks for it have checked grounds two broken one fixed those still no start...


check your ecm-ign fuse.if it is ok check to see if you have power to your spider injector.if you have power, you either have a bad computer or a bad connection between the computer and the inj.do you have spark??.if you have no spark check your ign module or bad connection at the ign module.i have seen that before.

Feb 01, 2011 | 1993 GMC Jimmy

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Dec 10, 2009 | 1993 GMC Jimmy

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Rough idle(rich) stalls in gear


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the computer controls the fuel injectors.they should measue about 1.4 ohms each.
put fuel directly into the throttle body and see if it will start.
check the wiring to the safety netral switch and all the grounds.
make sure that the ecu is seeing an input from the ignition switch.otherwise it will not turn on the pump.it is a complex setup and you need a wiring diagram

May 15, 2009 | 1993 GMC Jimmy

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