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      Yesterday, 08:52 PM   #1
TMR013
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Real mystery - Mechanic stumped

So, a couple weeks ago I took my 135 into my local independent with a right rear tire whine, he diagnosed a bad bearing and we replaced. I did inspect the old bearing and there was definitely signs of rust (makes sense we had some bad flooding last year, and I had to drive through some water that was pretty high). So I pick up the car and sure enough the whine is gone, but I drove about 2 blocks and I heard a new noise, kind of a grinding noise coming from the rear, definitely a rotating noise cause it has a frequency that changes with speed, starts at about 25 mph and fades in and out. I immediately turned around and drove back to take my mechanic for a ride. He heard it too and thought it might be the diff, said to bring it back and they will get it up on the lift and see if they can locate it.
So took the car back today, they heard the noise, pulled the axle apart again and tested the new bearing, said it was totally stable and noiseless, did not think that was it. He measure the rotors and did find a warp that was definitely out of spec. It made sense that it might be that since as I said the noise is something rotating, so we changed out the rear rotors. Put it back together, noise still there.
My mechanic could not figure it out. Still suspects the diff, but he checked the oil and did not see anything wrong there. He even crawled into the trunk through the rear seat while someone else drove to see if he could localize the sound.
This independent is well established and a very well reviewed BMW specialist. Been going to him for a couple years and always been satisfied. He only charged me the parts for the rotor replacement today, so I don't think he's trying to fleece me. He seems genuinely stumped. Going to talk to a guy he knows that's a BMW diff expert to see if he can help.
Anybody else ever run into something similar? It's really driving me nuts because it's not a sound that elicits confidence in the car, and I hate that I don't trust my Baby.
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      Yesterday, 09:26 PM   #2
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New sound with a new part, too good to be true. Something wasn't torqued down properly would be my first guess.

But you said they took it all apart and reassembled?
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      Yesterday, 09:32 PM   #3
lowbudgethero
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2009 BMW 135i  [4.00]
that would be my first guess
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      Yesterday, 09:42 PM   #4
TMR013
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Quote:
Originally Posted by ShocknAwe
New sound with a new part, too good to be true. Something wasn't torqued down properly would be my first guess.

But you said they took it all apart and reassembled?
Yup, completely pulled the bearing again. Pretty sure these guys wouldn't make that kind of mistake twice
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