Thread: Knocking Noise
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      09-27-2022, 07:47 AM   #3
Graves
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Drives: 2018 M3 ZCP
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2018 BMW M3 ZCP  [0.00]
Quote:
Originally Posted by TopJimmy View Post
Vacuum pump or maybe a HPFP getting noisy? You can take a length of fish tank air line, stick one end near your ear, and use the other end to hunt for the noise source. HPFPs are on the right side below the plastic intake manifold, and the HPFPs sit on top of the vac pump.
The noise definitely comes from the passenger side near the top. You can hear it good just kneeling next to the tire. I'm gonna try a different oil and drive it to see if the noise goes away. My dumbass drove it Saturday knowing the noise was there but didn't listen after it was good and warm if it was still present.
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