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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1685
Experience:  GM Grand Master Technician 2007. 14 year experience.
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Gmc s15 jimmy: I have a 2000 s15 jimmy with random misfire.

Customer Question

I have a 2000 s15 jimmy with random misfire. I have new cap rotor sparkplugs and fuel injection spider. I still have a random misfire on cylinders 3 and 4. I have tried two plug wires. compression test is within 5 pounds on all six . 4.3 . please help
Submitted: 2 years ago.
Category: GMC
Expert:  Gary replied 2 years ago.
Welcome! My name is ***** ***** I will do my best to assist you with this problem.
I am sorry for the long wait
everything done so far was to correct this issue and nothing has changed anything ?
it was # ***** and # ***** before misfiring before and after the work was done ?
and you know its 3 and 4 monitoring misfires with a scan tool ?
when will 3 and 4 misfire ?
just at idle ?
under load ? only when at speed cruising along ?