MISFIRE

2000 Pontiac Bonneville

Tiny

smalldarl

December, 19, 2011 AT 11:41 PM

Have a problem with misfire. Took the car to O'reily's and ran diagnostics. Told code was for ramdom misfires. Changed plugs and wires, runs the same. Very difficult acceleration with a lot of noise and rattling, once running over 35-40, seems to run fine. Took back to O'Reily's, code again said ramdom misfire. Suggested coil pack. Changed one that appeared to have a bad stem on it, still the same problem. I'm lost. Service engine light solid when idling or accelerating, flashing when achieves 35-40 mph.

FOUND 5708 RELATED QUESTIONS

Engine Miss

52 ANSWERS
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4 Answers

Tiny

saturntech9

December, 19, 2011 AT 11:54 PM

Have you checked for a restricted exhaust yet?

Tiny

smalldarl

December, 20, 2011 AT 12:00 AM

HOw do I do that?

Tiny

Wrenchtech

December, 20, 2011 AT 12:25 AM

With a good scan tool you should be able to see specific misfire counts on specific cylinders to help you isolate the problem.

Tiny

saturntech9

December, 20, 2011 AT 12:39 AM

A exhaust shop can check your exhust back pressure for you.

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