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      02-21-2019, 10:58 AM   #1
hetzle
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Drives: E90 335i
Join Date: Dec 2011
Location: San Francisco, California

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Engine sounds like Diesel only at idle?

EDIT: Turns out it's the new clutch/fw throwout bearing. All is good!

Hey all,

My engine has been making very weird noises, sounding like a diesel engine.

When does this happen?
-Clutch pedal NOT in
-Only at idle, when engine has warmed up
-Goes away around 800 rpm

What has recently changed?
-I just swapped to a new single mass clutch/fw which makes a TON of noise, but only when the clutch pedal is in. I can't tell if the noise happens with the clutch in due to the noise.

Is this related to the new clutch? Rod knock? I feel like it isn't due to the fact that it goes away with revs. It doesn't sound like the slapping noise I've heard from knock videos, it sounds very similar to an idling diesel engine.


Any input is appreciated!

Thanks
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2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk

Last edited by hetzle; 03-05-2019 at 04:50 PM..
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