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Weird buzzing from engine bay after car won't start?

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    Weird buzzing from engine bay after car won't start?

    My car won't start, and several times now after failing to start, right after I turn the key back from the start position, I get this weird loud buzz that happens 2-3 times. Each buzz probably lasts a half second or so. Any idea what it could be?

    #2
    Originally posted by firstRWD View Post
    My car won't start, and several times now after failing to start, right after I turn the key back from the start position, I get this weird loud buzz that happens 2-3 times. Each buzz probably lasts a half second or so. Any idea what it could be?
    starter solenoid??

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      #3
      When you say fails to start, is it turning over and just not firing? If it's not turning over at all, it sounds like a bad starter.
      Woody - 1986 325es 5 spd 2.7i
      Xena - 2008 X3 3.0is
      Hellena - 2010 550i GT
      Otto - 1988 535is 5 spd- RIP
      Otto II -2002 540i 6 spd M sport pkg - sold!

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        #4
        Buzzing could be the idle control valve. How loud are we talking here?

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          #5
          Check cold start injector and ICV.


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          1987 325e Lachssilber w/ MarkD chip and late bumpers, Zender EVO spoiler, s3.25 LSD

          Originally posted by nando
          I don't think there's really strong evidence that ZDDP harms cats.

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