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      03-18-2019, 11:07 AM   #9
F30NFifty5
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Drives: F30 335i XDrive 6mt / e83 X3
Join Date: Nov 2018
Location: Queens, New York

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Quote:
Originally Posted by StNik View Post
The problem is solved. But I still can't believe it. The car runs smoothly and quietly, like new.

I couldn't find any drive train issues as expected, and didn't replace any parts.....that I know of.

But, on a whim, after filling-up the other day, I added a small bottle of STP Fuel Injector Cleaner to the fuel tank. First time ever. Two days later the vibration is gone. Car is like new. Either the STP fixed something or my wife secretly took the car in for repairs before I got in over my head on this issue LOL :-)
When I changed my transfer case gear, I left 2/4 13mm bolts for the subframe brace a little lose and I got a pretty wicked vibration. Check those 4 bolts if the vibration comes back. Think I'll try some of that STP Fuel Injector Cleaner as well just for sh*ts and giggles.
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