Engine knocking sounds... Please help!
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05-27-2012, 06:14 PM
Join Date: Dec 2011
Location: South Florida
My Ride: 2004 BMW 325i
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Vacuum leak if I had to take a guess. Happened to me once when I put on a new lower intake boot and it slipped off a bit. Only time I ever heard a sound like that. I could be wrong but I would check where a MAJOR vac leak could happen.
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