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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Vibrations around 1800rpm in neutral



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      12-31-2017, 12:47 PM   #1
tom9192
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Vibrations around 1800rpm in neutral

My '06 325i has slight/mild vibrations coming from the engine. The vibrations start around 1800 RPM and the frequency increases as the rpm's increase. This happens even when the car is in neutral and stationary, so that rules out brakes, tires, etc. No check engine light. Nothing obvious sticks out when I look under the hood. Car has 135k miles on it.

Any ideas? Anything I can be checking?

Thanks!

Last edited by tom9192; 12-31-2017 at 02:36 PM.
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      01-01-2018, 12:49 PM   #2
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Figured out that my DMF is going bad. Noticed grease by the flywheel during an oil change. Guessing this is the reason for the vibrations
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      01-02-2018, 01:40 AM   #3
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Quote:
Originally Posted by tom9192 View Post
My '06 325i has slight/mild vibrations coming from the engine. The vibrations start around 1800 RPM and the frequency increases as the rpm's increase. This happens even when the car is in neutral and stationary, so that rules out brakes, tires, etc. No check engine light. Nothing obvious sticks out when I look under the hood. Car has 135k miles on it.

Any ideas? Anything I can be checking?

Thanks!
Yes, the loss of grease in the flywheel causes rotating imbalance (increased vibration). I don't know how these flywheels are built so I can't say if the grease will re-proportion itself and "self balance" where grease was lost. Good luck!
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      01-04-2018, 10:02 PM   #4
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Never heard of that, grease in dmfw?? It looks like it's from your throw out bearing, if you look at the grease, it's from being pumped out of something stationary. There is no way grease will look like that in a flywheel. The centrifugal force, and the heat will liquidify the grease and throw it across the flywheel. If any grease was to make contact with your clutch, it would burn it up, possibly slip. Your vibration is either from motor or trans mounts. Bty,the flywheel is balanced by removing/ adding steel.
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      01-05-2018, 12:23 AM   #5
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Quote:
Originally Posted by JuniorB View Post
Never heard of that, grease in dmfw?? It looks like it's from your throw out bearing, if you look at the grease, it's from being pumped out of something stationary. There is no way grease will look like that in a flywheel. The centrifugal force, and the heat will liquidify the grease and throw it across the flywheel. If any grease was to make contact with your clutch, it would burn it up, possibly slip. Your vibration is either from motor or trans mounts. Bty,the flywheel is balanced by removing/ adding steel.
I wish that were the case, but the DMFW on these cars are filled with grease and springs.
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      01-14-2018, 11:33 AM   #6
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Replaced with Valeo SMF kit and the vibrations are gone. Couldn't be happier with the SMF either. No chatter, feels smooth, and happy that I won't have to replace it ever again
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