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      01-20-2013, 04:02 PM   #5
Juiced46
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Drives: 03 Turbo Cobra, 2011 335xi
Join Date: Jun 2010
Location: Wallingford CT

Posts: 1,027
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Why did you replace the intake manifold?? Your car isnt idling because you have a vacuum leak, that is the hissing noise. . The gaskets are reusable on the intake manifold. Make sure the oil cap is on there correctly and locked. Where do you hear the hissing noise coming from?
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