My Conclusions Although I haven't tracked down the rough idle yet, I've recently read a 93 page thread about rough idles and hesitation.
I've replaced all of the main things that cause rough idle and have yet to perform a Leak down or compression test. After narrowing down the possible causes, I've come to the conclusion that: It may be another vacuum leak somewhere It may be my rear O2 sensor It may be my Crankshaft position sensor It may be something internal
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More Ideas After replacing and researching parts, I came to the conclusion that everything I was doing was not fixing the issue and it must be something else.
I've heard theories: Lower Oil weight to 5w-30 and it will smooth out idle The M44 simply always rough idles Vacuum leaks are always the cause of rough idle on the M44 The ignition components used on the M44 are a poor design The fuel pump causes rough idle before it fails The cam position sensor is the problem most of the time The Beginning When I bought my Z3 in the beginning of March 2012, it developed a rough idle. I was determined I could track it down and began throwing parts at it.
List of Parts:
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AuthorI enjoy maintaining my vehicles and documenting my experiences. I Hope This helps save people money. Archives
February 2014
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