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zzdaryl, Shop Owner, Master Mechanic
Category: Pontiac
Satisfied Customers: 12549
Experience:  28 years experience, Master Mechanic
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2001 Grand Prix GTP: a misfire in cylinder 5..ignition coil..cranked

Customer Question

2001 Grand Prix GTP code shows a misfire in cylinder 5, changed plugs, wires and ignition coil did not fix. Car will run normally when first cranked but miss will return after a while.
Submitted: 7 years ago.
Category: Pontiac
Expert:  zzdaryl replied 7 years ago.
This is usually caused by a bad fuel injector, you can test the injectors for resistance and see if the #5 is much different from some of the others if it is I would change it and see if it helps, you might also look for wiring damage to the #5 injector.
zzdaryl and 4 other Pontiac Specialists are ready to help you
Customer: replied 7 years ago.
Sorry to take so long to get back to to you I had internet problems yesterday, I went out this morning and checked the injectors found #1 12.9 #3 12.9 #5 10.4 this looks to be the problem, Thanks.
Expert:  zzdaryl replied 7 years ago.

Great, thanks for the accept.