1989 BMW 325 spark plugs are black after being changed

1989 BMW 325
146,000 MILES • 6 CYL • 2WD • MANUAL
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TDPROPHET
  • MEMBER
  • 1 POST
I just had an engine replaced in my bmw. and now it revs high and low by itself and jerks. The mechanic says that he took the plugs out and they were black. I don't know what the propbelm.
Dec 4, 2009 at 2:00 PM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Too much fuel, probably a poor connection at the injector harness, look for the round connector below the throttle body down next to the engine block, inspect and report back.
Dec 6, 2009 at 10:45 AM
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