MISFIRE

  • Tiny
  • smalldarl
  • 2000 Pontiac Bonneville
  • 108,000 miles

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.

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Monday, December 19th, 2011 AT 11:41 PM

4 Replies

  • Tiny
  • saturntech9
  • Expert
  • 29,318 posts

Have you checked for a restricted exhaust yet?

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Monday, December 19th, 2011 AT 11:54 PM
  • Tiny
  • smalldarl
  • Member

HOw do I do that?

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Tuesday, December 20th, 2011 AT 12:00 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,028 posts

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

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Tuesday, December 20th, 2011 AT 12:25 AM
  • Tiny
  • saturntech9
  • Expert
  • 29,318 posts

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

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Tuesday, December 20th, 2011 AT 12:39 AM

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