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Misfire

Tiny
SMALLDARL
  • MEMBER
  • 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
  • MECHANIC
  • 30,869 POSTS
Have you checked for a restricted exhaust yet?
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Monday, December 19th, 2011 AT 11:54 PM
Tiny
SMALLDARL
  • MEMBER
  • 2 POSTS
HOw do I do that?
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Tuesday, December 20th, 2011 AT 12:00 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 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
  • MECHANIC
  • 30,869 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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