01-12-2021, 07:05 PM
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Member
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Join Date: Jun 2014
Location: SA, TX
Posts: 6,476
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Quote:
Originally Posted by minesapasty
Having read where all these different clunking noises come from, in my case, the clunking increases as the car goes faster, the fact that the road surface is rough or smooth seems to make little difference, only speed, at crawling speeds, the clunk will be rare but loud, once 20 mph has been reached, the clunk seems quieter, but faster..... then there are times that the noise seems to disappear, whether turning or driving in a straight line seems to make no difference either. Being in a built up area or out in the countryside doesn't seem to make any difference, I was thinking that sound was being thrown back when passing a wall, but after driving 30+ miles with the window down, it doesn't appear to matter...... it is very strange
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Suspension noises are hard to pin down in general. Then add to that trying to do it over the net without hearing it personally. One person's clunk is another person's click, is another person's thunk if you know what I mean. Could you get an audio recording of it?
Quote:
Originally Posted by minesapasty
Mine has just hit the 110.000 miles marker.
In my limited knowledge of cars, I tend to think that because the noise is related to the car moving, then it must be drive train, and the fact that the clunk seems to clunk faster as the car moves faster also points in that direction.
The mechanic that I use is an old school mechanic, and he has checked everything, drive shafts, universal joints/CV joints, brakes, just about anything that moves when the car starts to roll..... there is really only the gearbox or transfer box left. Do the gearboxes and transfer boxes split on the e70 or are they like some 4x4s where they are a single unit?
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Trans and Xfer case are separate units. Weird the mech couldn't pin point it. This is why I typically bite the bullet on used BMW's around your mileage (100k miles +/-) and do the whole lot of it rather than racking my brain looking for a singular failure point. If you find it guaranteed the next piece will fail in short order.
Edit: Your car is an earlier E70. Perhaps it suffers the driveshaft problem that BMW had a TSB for? Just a guess as it fits your drivetrain description and would change frequency/volume based on conditions.
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