[Nando_e90]

Hello!

I have a new problem with my 2006 330i. I've notice that when I'm in traffic at low speed, there is a clunk under the car every time I release the pedal or I accelerate. It happens in those cases when you use the brakes very little, and just keep accelerating and decelerating to mantain certain speed in traffic (15 mph). Every time I accelerate, I can hear a noise (a "clunk") and can feel like if something engages under the car, and when I suddenly release the pedal (without applying brakes) to reduce speed, I can hear and feel it disengaging.
If I accelerate-decelerate-accelerate-decelerate, I hear and feel clunk-clunk-clunk-clunk.

I sounds to me like a play between two gears or something similar under the car. Like if the linkage between the transmission and the differential is going bad. I would think in flex disc (guibo), but I replaced it a year ago when was having the 2-1 jerking issue, before replacing solenoids. I thought that was the problem.

Maybe someone has any idea or has had same issue. It is really annoying driving at low speed in traffic with this problem.

[Tambohamilton]

The dampeners at the drive shaft centre bearing, most likely.

[Meeni]

Broken giubo disk on the output shaft ?

[Chris1337]

Having the same exact problem. Has anyone diagnosed this yet? Next Saturday I will be putting the car on the lift to see what the noise is

[iconfat]

Sounds drive shaft related. Likely a bad U joint. BMW will tell you they can't be replaced and to buy a new shaft. However there are drive shaft shops that change them and do a good job at it.

[oVeRdOsE.]

Originally Posted by iconfat

Sounds drive shaft related. Likely a bad U joint. BMW will tell you they can't be replaced and to buy a new shaft. However there are drive shaft shops that change them and do a good job at it.

this.

exact same issue. u-joint were shot.
I was already on a jobber/refub drive shaft, so I got my u-joint on rockauto for 20$.

[gbalthrop]

Originally Posted by Cala

. 2006 330i. I've notice that when I'm in traffic at low speed, there is a clunk under the car every time I release the pedal or I accelerate...

See if you can produce the same sound/clunk by shifting from R to D or D to R (R to 1st w/ light clutch app if MT) when standing with Brake applied (NO movement of vehicle, just change of torque direction on drive shaft & engine/ transmission mounts.

If you can duplicate the sound, then get a helper to do gear changes while you listen (safely from the side at ground level, NOT beneath vehicle ;-) to determine source of sound/ impact. It could be ANYWHERE in the Drive Shaft joints/ bearing, front motor mount, transmission mount, even exhaust bracket.

Simply putting it on a lift and looking at it won't necessarily identify the source of the clunk. Unless it's something REALLY broken & obvious, you need to hear/ feel the clunk & unwanted movement from beneath the vehicle. As always when working/ observing beneath vehicle, THINK & STAY SAFE.

George

[Nando_e90]

Originally Posted by gbalthrop

See if you can produce the same sound/clunk by shifting from R to D or D to R (R to 1st w/ light clutch app if MT) when standing with Brake applied (NO movement of vehicle, just change of torque direction on drive shaft & engine/ transmission mounts.


George

So, I paid attention and yes, I can hear a clunk when shifting D-R and R-D with brake applied. I'll try today to have someone doing that for me so I can try to identify the source. Engine and Transmission mounts were replaced 4 months ago, so problem must be driveshaft related.

Thanks for your time.

[Chris1337]

Was a bent piece of the cross member. Car squats when put into reverse so that's what caused it to hit the subframe

[Nando_e90]

Originally Posted by e90_enjoyer

Hey Nando_e90, did you ever figure this out? Having the same issue on my 330i 6MT. Thinking it’s the carrier bearing but haven’t had opportunity to get under the car.

It got solved after installing the xHP Flash stage 2 to the tranny a year ago.
Right now that symptom is back again but not all time. I think it has to do with other factors (serviced the transmission and reset adaptation 4 months ago, Disas and Excentric Shatf Sensor went bad, and others). Will try XHP stage 1 in a few days and see.

But if your e90 is Manual Transmission, then my experience means no help to you I think.

[Threehundred]

Originally Posted by e90_enjoyer

Hey Nando_e90, did you ever figure this out? Having the same issue on my 330i 6MT. Thinking it’s the carrier bearing but haven’t had opportunity to get under the car.

Any luck yet? Been trying to track down this same issue on a 328i 6mt

[Nando_e90]

Originally Posted by Threehundred

Any luck yet? Been trying to track down this same issue on a 328i 6mt

At that time it got way better when I installed XPHFlashtool to the AT transmission, but it came back a year after. In my case I think it has to do with valve body pressures.