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2000 Pontiac Bonneville MISFIRE

Tiny
ACSHIRLY
  • MEMBER
  • 2000 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 171,000 MILES
I have taken my car to the shop several times and they put the computer on it and say that all it shows is a random misfire, which the mechanic says could be several different things. They checked the wires, the coils, I had them to replace the plugs again
last week, just in case they had gone bad. I got the car out of the shop on Friday, August 13,2010 and drove it to work on Monday the 16th(aprox 70 miles)
and the same thing happened. It started skipping and then the service enginge light came on. I made a stop in town and when I cranked the car the light went out. The weird thing is when the light comes on the engine seems to smooth out and run better.
I love the car but this is driving me crazy because I am nervous about being on the interstate and breaking down. PLEASE HELP
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Tuesday, August 17th, 2010 AT 8:11 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
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Tuesday, August 17th, 2010 AT 12:39 PM

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