Question about 2000 GMC Jimmy

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2000 gmc Jimmy misfiring

Runs good up to about 3000 RPM then starts to misfire put new cap, roter, plugs but still does it also when the motor get warm it starts to misfire around 2000 to 2500 RPMs

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  • Anonymous Mar 23, 2014

    Idles fine but real slugeish on power until it gets around 3000 rpms then you can feel it kick in and start picking up in power, only getting 11 mpg with 4.3 vortec

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Change fuel filter ,have inject. system cleaned

Posted on Mar 12, 2009

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I have a 2000 gmc jimmy with a service engine soon light. i received the code p0302 misfire detected cylinder 2.I replaced spark plugs and distributor cap and rotor. but still on. any other suggestion?


Well, Spark Plugs wear over time,seldom fail to fire
A worn or dirty rotor and cap will still fire, also

You never throw new wires at it,I don't,mine last 18 years,
on all vehicles

You need some OBD2 knowledge,start studying

The PO302,last # is the cylinder
Number 2 is misfiring

If you got individual coils, go there
If you got an ignition module, for all the cyl,go there
If you got plug wires,there is an extremely odd chance, one burned out inside ,on #2
& you did say your have a dist cap.

So you do have a cylinder monitor,that detected it
That may be the crank sensor,another possible

Need to know the system and how to test it.

You need to give veh specifics ,not just a year

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