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1999 BMW 540i Question: I've accidently floored the accelerator when I've started my 540i A.

 

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540, Aurora, CO, November 09, 2011, 07:30
 Rookie

Now the car has a clipping sound, almost like the fan touching something, coming from the timing chain on the rightside bank of the engine. What could this be and what will need to be replaced? The car still starts and idles with no missfire. Idling is a little rough though with the clipping sound very load while idling.

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    patrick mannion from Greg Solow's Engine Room, November 09, 2011, 07:36
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     Master

    It could be many things, unfortunately and without hearing the noise first hand or being able to do some basic diagnostic tests or be able to drive the car, its hard to say what the source of the noise may be. If the engine "over reved" carbon under the valves could be dislodged and may cause a misfire, does the check engine light come on while the engine is running? The problem may go away but safest to get a professional experienced with BMW to listen to the noise and se what they think is causing the noise.

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    540, November 09, 2011, 07:48
     Rookie

    There is no warning lights burning while the car idles,and it does not missfire while idling. I don't want to drive with the car as it might cause more damage to the engine. Could it be the timing chain's guide rails or maybe tensioner that took a beating? What about the Vanos? Could something have dislodged or broke? I've had a few leads to what it might be, but no one can tell for certain what could be wrong. All of them stated that I need to open up the front end of the engine to determine the problem. I've hoped to try and rectify the problem without taking anything apart.

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