Bimmerfest - BMW Forums - View Single Post - engine problem,not sure.2006 bmw 645ci
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Old 01-22-2013, 05:18 PM
HerbP HerbP is offline
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Location: Georgia
Join Date: Jul 2009
Posts: 5,181
Mein Auto: 2005 645Ci & 2007 750Li
The only thing of that could make a clacking noise while the key is in the 2nd position would be the ValveTronic motor try to calibrate itself. There are 2 motors under the engine cover, one on each side. If the noise is coming from either one, you have valve train problems. This could cause the motor to backfire! You probably need to get the car to a proper mechanic, before any more damage is done.

Good Luck!

Last edited by HerbP; 01-23-2013 at 04:39 PM.
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