mystery vibration

[bimbim]

changed out all fuel, ingnition related items, car was put on a real time scanner, found no sensors defective, new ingitor, plugs, wires.

engine seems to shake at high rpms, could it be a valve? or bent rocker arm?

[bimbim]

Has a resolution to a similar problem every been so serious as to have the entire motor rebuilt?

[bimbim]

did a compression test all 180 cold, motor good.

[668M42]

motor mounts? any abnormal sounds?

[bimbim]

I guess I'll go ahead and replace the motor mounts, however they do look ok, no oil on them and they appear in the correct positions....but you never know....

I notice the gear shifter make a weird vibration sound at highway speeds, so what sort of mounts are associated with the linkage? I'm going to look at OEM.com for some replacable items.

[bazar01]

How many miles on the car?

1. Could be a DMF failing or separating?
2. Clutch disc with broken friction material or missing spring?
3. Drive shaft rubber damper going bad.

[bimbim]

130000, I replacedthe clutch a little over two years ago, and was a very careful driver...I replace the Guibo and looked at it the other day....yeah I've heard that the DMF may cause this, but the clutch sure feels great when I drive it, the vibration is only slight, and does it from a standstill as well as when driving.

I wanted to jack it up and run it while looking underneath, somehow, maybe take is to a muffler shop so it can be done safely....

[Diego318]

i had this problem, and it was the motor mounts.

[bimbim]

OK I'll put in the order for MM's and take it from there, I'll keep posting results, hope to god its not the DMF...!

[bimbim]

vibration is getting really noticeable when downshifting esp to 2nd, the whole car shakes, I'm hoping its the motor mounts, don't know what else it could be....?

[bimbim]

right side Motor mount was broke, may possible be caused by the initial vibration, now it seems like it still has the vibration but it is very slight, next is the harmonic balancer, but thats it unless I blow the clutch.

[zoner]

Might want to take a look at the transmission mounts as well- if you had a busted motor mount, there was certainly some undue stress being put on those mounts while it was busted. They're relatively cheap and you can DIY in about 30 minutes. I replaced mine about a year ago solely based on age/mileage (the mounts were not broken) and the difference was noticeable.

Motor mounts

[bimbim]

replaced those first ....long time ago, I did a bit by bit, easier to more difficult replacement process, including all ignition components, sensors, all that was checked already.

[bimbim]

going to have to take it to a professional bmw mechanic not a wanabe.