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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Occasional thumping sound on Cold Start? (AT)



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      09-17-2012, 01:15 PM   #1
jyeah
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Occasional thumping sound on Cold Start? (AT)

Hi All,

Starting last month, I've been noticing that when I first cold start my car (or sometimes after I parked for 20-30 minutes) that I would occasionally hear this "thump" sound that almost sounds like what you would hear when you shift between D and P. It occurs very intermittently (i.e. maybe one out of 5 times) and I was wondering if anyone has also experienced the same problem and have any proposed fix?

I don't think it's a normal sound as it doesn't happen all the time.

My car's a 2010 E90 AT.

Thanks,
John
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      09-17-2012, 01:36 PM   #2
joec500
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Misfires
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2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch
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      09-17-2012, 02:48 PM   #3
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I have a similar issue, its def not misfires for me, it almost shakes the car a bit when it starts, i think mine is either serpentine belt engine mounts oe transmission?
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