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Originally Posted by leebermeister
Your N51 should have a 3 stage intake manifold. Have your DISA in your manifold checked to see if the flaps or any associated parts are loose causing the sound. When you said the sound comes during heavy accel between 2 - 3,000 rpm makes me suspect it.
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I hope you are right, man. Again it does not occur during normal driving, only when I floor the pedal. The knocking goes away after 3000rpm. I checked oil and it is at optimum level (3 bars) as it was when I got an oil change 3000 miles ago.
Can anybody recommend a good mechanic in Philadelphia, Southern Jersey area who can take a look at my car?
Thanks