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2000 BMW 330ci lack of power/backfire

Tiny
PEDROFLO
  • MEMBER
  • 2000 BMW 330CI
  • 3.0L
  • 6 CYL
  • RWD
  • MANUAL
  • 197,000 MILES
I am experiencing lack of power in my 330ci, I did the head and I have replaced plugs, MAF sensor, fuel pump, fuel filter, oil filter, oil, intake boots, all compression is great and yet it seems to have intermittent power loss accompanied by a small backfire on reduction of revs in same gear. I have plugged into diagnostics and no codes appear?
Could it be Coils?O2 sensor or Vanos?
I am at wits end and have spent a small fortune, please help.
Thanking you
Pedro.
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Monday, December 9th, 2013 AT 5:19 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
It sounds like you have already done a lot of work. Have you checked the catalytic converter to see if there is any blockage there? I hate to say it, but this may be a problem that you need to wait till it gets worse to locate where the issue is.
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Monday, December 9th, 2013 AT 8:41 AM

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