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Old 11-16-2012, 02:17 AM   #2
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Join Date: Jan 2010
Location: Seattle, WA, USA
Posts: 89
My Ride: 2001 M3 TiAg
I cannot accurately say, but maybe the VANOS solenoid? It may not be actuating the intake cam and therefor causing bad timing. The solenoid with broken solder points also exhibits intermittent faults as the connections may be maintained for a while, but then jolted open at some point and producing error codes again.

Although could be other things. I had similar issues (exhaust cam) and it was the VANOS itself, which was a rather expensive repair.
Slyde is offline   Reply With Quote