Thread: Erratic idle on cold start (N54 135i)
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      10-17-2018, 06:06 PM   #4
AlpineTi
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Drives: 2009 135i, 2007 Tacoma
Join Date: Aug 2013
Location: West Chester, PA

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Your valve cover is probably cracked. It starts at the seam for the PCV system right behind the oil cap and works downwards towards the head. It will cause a rough idle, especially on cold start.
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