2000 BMW 330ci lack of power/backfire

2000 BMW 330CI
197,000 MILES • 3.0L • 6 CYL • RWD • MANUAL
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PEDROFLO
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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.
Dec 9, 2013 at 5:19 AM
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JACOBANDNICKOLAS
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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.
Dec 9, 2013 at 8:41 AM