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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 > start up noise



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      05-13-2011, 06:27 PM   #1
akuliest
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start up noise

hey guys i just purchased a used 2007 335i coupe 6mt (cant stop driving it!). unfortunately i noticed that when I start and stop the car i hear a noise, kind of like an old fan rattling? do you guys have that too?
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      05-13-2011, 07:32 PM   #2
ren
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it's most likely the exhaust flap that rattles. You can disable it (golf tee mod) and check if you still hear the same noise.
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      05-13-2011, 10:04 PM   #3
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I think I have the same noise
I hear it only on startup or when I turn the car off. And if by mistake the engine is about to stall (manual trans). Seems to happen at very low toms. Kind of a clunking noise, right. Mine is definitely not the exhaust flap. I told my SA, they kept the car for two days and couldn't figure it out. But they assured it's nothing dangerous...
If someone knows what this is please chime in
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      05-13-2011, 10:05 PM   #4
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Toms is rpms . iPhone app won't let me edit...
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'08 E90 335i, MT, VRSF 7" HD, VRSF CP, Fuel it stage 2 LPFP, CSF radiator, more on the way!
'16 MK7 GTI DSG, bone stock
SOLD '10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2, Mfactory LSD
SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, DCI, ACT, Nitto Nt555
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      05-13-2011, 10:07 PM   #5
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i had that same exhaust flap noise at startup, turns out my waste gates were bad, so BMW installed new wastegates and 2 brand new turbos
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