3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
About the noise from the back, that's almost certainly a need of new gear oil in the differential.
That's kind of what I was hoping... I'd hate to have to try and find a 25 year old differential!
I did notice on the emissions tag under the hood that "ignition timing and idle speed: No Adjustment Required"
Well, the diff oil wasn't it. There was some foam in the old oil, and the noise seemed to stop for a day. Then last night a right turn in a parking lot brought it all back, a deep rumbling noise from the rear of the vehicle.
Any ideas on how to proceed? There are some rubber couplings that look almost like the old front axle 'donuts' that were on the Saab 96's from the sixties, but I don't see any physical damage on those... Then, near the wheels, there are CV joints, but CV's usually chatter when they go bad, not a groaning sound... and CV's usually show boot damage,which I don't see.
I'm hoping some of you seasoned people will jump in with ideas on how to proceed...
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