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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 11-11-2014, 09:28 PM   #1
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Join Date: Jun 2012
Location: Lansing, Detroit MI
Posts: 10
My Ride: 2002 M3
M3 transient rubbing noise

2002 M3 with 112 on clock. Last year, I replaced the input seal to the differential but I made the mistake of spinning the input shaft lock nut off without counting the revolutions to get the same exact torque on reassembly. I put it back on and blipped it a few times with a powerful impact. About a year later, it's now making a rubbing noise (almost like a tire rub) with sharp left handed turns (no noise on similar right turns) from the rear. I'm not sure it's the diff as I've also had to replace a rear wheel bearing. Is there a way to diagnose the noise other than putting it up on a lift and poking around with a stethoscope?

My main question is, how sensitive are the diffs to input shaft lock nut torque variances ie did I doom my diff by being an idiot? If so, I'll be getting 410's for christmas.

Also, I've got a veritable christmas tree with ABS, BRAKE, Traction control, and Tire pressure lights on which obviously means a bad or dirty wheel speed sensors. Do they often fail or just need to be cleaned? Also, is there a way to localize the problem to a corner?

Any input is very appreciated.

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Old 11-13-2014, 06:08 PM   #2
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Join Date: Oct 2010
Location: Saskatchewan, Canada
Posts: 579
My Ride: 2003 M3 6SPD
Specific BMW software like INPA will tell you which sensor(s) are throwing codes. There are two different kinds of sensors depending on the model year, I forget where it changed. Only 1 of them tends to get fouled and need cleaning.
Originally Posted by svtmike
Your TL is an eminently replaceable mass production inaninimate object that doesn't give a sh*t about you.
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Old 11-17-2014, 11:56 AM   #3
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Join Date: Nov 2014
Location: New York
Posts: 1
My Ride: audi r8
interested in what the sound is i am interested in buying a car that makes the same sound around tight turns, mentioned he had spacers in rear doesn't do it with stock wheels. i see no signs of rubbing, almost feels like brake is dragging his rotors were warped too.
dotworks01 is offline   Reply With Quote

differential noise, wheel speed

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