Question about 1997 GMC Jimmy

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Vehicle start shaking and died. Has a trouble code P0300

1997 GMC Jimmy with a dignostic trouble code P300, What does it mean?

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  • daylyna May 25, 2009

    I have the same problem. I have had the distributor changed, injectors checked, spark plugs and wires, had the exhaust valves replaced, as it had warped, head gaskets, intake manifold gasket, map and maf sensors, oxygen sensors, and I still have the same problem. At 80 on a slight incline, the truck starts to chug and shutter and loses power. If I floor it, it will stop chuggin and even out, but the check engine light flashes.... still not sure, but thinking about replacing the computer...and input would be appreciated.

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Error code P0300 means that you are having multiple/random cylinder misfires.  I would start with changing all of the spark plugs and see if that will fix it.  You will have to have the code reset at an auto parts store.  If that doesn't work let me know and we can progress down the line.

Posted on May 18, 2009

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do you have some trouble code to give us?
what is the fuel pressure?
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A code P0306 may mean that one or more of the following has happened:

Faulty spark plug or wire, Faulty coil (pack), Faulty fuel injector, Burned exhaust Valve, Poor compression, and Defective computer. 

Check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the Caravan, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). The number six cylinder is the one towards the radiator and drivers side. If you are going to change all the plugs and wire keep me posted, be glad to help. Good luck and hope this helps, P0300 just means multi miss fire. 

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1 Answer

97 GMC Jimmy starts when it wants to!


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