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.
Do you
have the same problem?
Yes
No
Monday, December 19th, 2011 AT 11:41 PM

4 Replies

Tiny
SATURNTECH9
  • EXPERT
Have you checked for a restricted exhaust yet?
Was this
answer
helpful?
Yes
No
Monday, December 19th, 2011 AT 11:54 PM
Tiny
SMALLDARL
  • MEMBER
HOw do I do that?
Was this
answer
helpful?
Yes
No
Tuesday, December 20th, 2011 AT 12:00 AM
Tiny
WRENCHTECH
  • EXPERT
With a good scan tool you should be able to see specific misfire counts on specific cylinders to help you isolate the problem.
Was this
answer
helpful?
Yes
No
Tuesday, December 20th, 2011 AT 12:25 AM
Tiny
SATURNTECH9
  • EXPERT
A exhaust shop can check your exhust back pressure for you.
Was this
answer
helpful?
Yes
No
Tuesday, December 20th, 2011 AT 12:39 AM

Please login or register to post a reply.

Recommended Guides