Thumping Sound - BMW Forum

5351 DRIVER · 06-10-2009, 08:23 PM

I have a 1990 535i . I am starting to get a thumping sound from under the car.
Not sure where. It doesn't hit anything under the car, just this sound at low speeds. Any suggestions?

jimoreno · 06-11-2009, 08:45 AM

is it when starting from a stop or accelerating? If the answer is yes, then most probably you have a bad driveshaft support bearing. Check your rubber flex disc or 'guibo' at the tranny end of the driveshaft (looks like a rubber donut). It it's a thump when shifting into reverse or forward it probably is the differential mount.

H2SNOW · 06-11-2009, 02:10 PM

I was going to suggest letting grandma out of the trunk ....

5351 DRIVER · 06-11-2009, 08:53 PM

Quote:

Originally Posted by jimoreno

is it when starting from a stop or accelerating? If the answer is yes, then most probably you have a bad driveshaft support bearing. Check your rubber flex disc or 'guibo' at the tranny end of the driveshaft (looks like a rubber donut). It it's a thump when shifting into reverse or forward it probably is the differential mount.

iT HAPPENS WHEN GOING REAL SLOW LIKE GOING THRU A DRIVE THRU BANK ETC. AND ALSO FROM A START. Doesn't happen all the time, but is starting to happen more and more.

rashid · 06-12-2009, 02:37 PM

Check the control arms bushings ...