Hi, so here is my E92 335 having a weird issue: the car sometimes vibrates, when off the gas with a gear engaged.
Imagine this:
I put in the third gear, rev it up to 5500rpm, go off the gas and the car is OK (well, I think I feel very small vibrations). Then, I press clutch and go off the clutch (it does not matter whether I change a gear) and the car begins to vibrate a lot. The gear shifter vibrates.. as well as whole car. I can change to whatever gear and it will vibrate at whatever RPMs (the vibrations are still present only when off the gas).
After few seconds of smooth driving I try to decelerate again and... the vibrations are gone.
When I went to have the car inspected the first time, they found nothing else but a damaged pinion nut and "metallic" contamination in the diff oil. After opening the diff, the bearings looked shot, as if they were over-tightened during the first LSD rebuild 6 years ago. So we thought that the issue had been discovered.
I had all the bearings in my mfactory lsd replaced by a shop that repairs transmissions and differentials..
Unfortunately, the problem appeared again. The question is whether it was present immediately or it returned later.
Anyway.. Guys who did the diff bearings job think that it might be the halfshafts. Others tell me it might be the driveshaft. When the car was inspected again all looked OK without any plays.
There must be something worn that moves after an abruption of torque and causes vibrations.. then it "self-repairs", when the torque forces are gone.
Imagine this:
I put in the third gear, rev it up to 5500rpm, go off the gas and the car is OK (well, I think I feel very small vibrations). Then, I press clutch and go off the clutch (it does not matter whether I change a gear) and the car begins to vibrate a lot. The gear shifter vibrates.. as well as whole car. I can change to whatever gear and it will vibrate at whatever RPMs (the vibrations are still present only when off the gas).
After few seconds of smooth driving I try to decelerate again and... the vibrations are gone.
When I went to have the car inspected the first time, they found nothing else but a damaged pinion nut and "metallic" contamination in the diff oil. After opening the diff, the bearings looked shot, as if they were over-tightened during the first LSD rebuild 6 years ago. So we thought that the issue had been discovered.
I had all the bearings in my mfactory lsd replaced by a shop that repairs transmissions and differentials..
Unfortunately, the problem appeared again. The question is whether it was present immediately or it returned later.
Anyway.. Guys who did the diff bearings job think that it might be the halfshafts. Others tell me it might be the driveshaft. When the car was inspected again all looked OK without any plays.
There must be something worn that moves after an abruption of torque and causes vibrations.. then it "self-repairs", when the torque forces are gone.
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