Undercarriage Knocking Sound

fAT bENG

Member
Hi All

I'm driving a 2011 E92 M3. My car got this knocking sound coming from the undercarriage. The sound is more noticeable when the car is accelerating. Any of you guys ever encounter such knocking sound? Please share.

Thank you.

fAT bENG
 
Re: Undercarriage Knocking Sound

I just had it today. Hoisted up the car, realized a fastener was worn and the plastic flap scraped against the tarmac at high speeds.

I suggest you get it checked, could be a lot of reasons other than this. Just go to any of our site sponsor workshops for more reliable service.
 
Re: Undercarriage Knocking Sound

hi seanskye

the workshop have hoist it up and can't find anything unusual. then they claimed that pml told them the sound comes from the LSD? you heard about this? or can anyone verify it?

thank you.
 
Undercarriage Knocking Sound

fAT bENG;1066668 said:
hi seanskye

the workshop have hoist it up and can't find anything unusual. then they claimed that pml told them the sound comes from the LSD? you heard about this? or can anyone verify it?

thank you.


Get it checked out by a reliable site sponsor workshop like R2D or Boss. Like I mentioned, many potential areas that could produce noises underneath... suspension, joints, etc. you can find the site sponsors in the forum directory here...

http://www.bmw-sg.com/forums/site-sponsors/

Call them to book an appointment as they are usually quite packed.

Good luck and enjoy the ride!
 
Re: Undercarriage Knocking Sound

fAT bENG;1066668 said:
hi seanskye

the workshop have hoist it up and can't find anything unusual. then they claimed that pml told them the sound comes from the LSD? you heard about this? or can anyone verify it?

thank you.

Sound from LSD usually happens when making tight turns, not when accelerating from what I know and experienced.
 
Re: Undercarriage Knocking Sound

might be the mounting from the center sub.
i just changed all my mounting.
 
Re: Undercarriage Knocking Sound

fAT bENG;1065484 said:
Hi All

I'm driving a 2011 E92 M3. My car got this knocking sound coming from the undercarriage. The sound is more noticeable when the car is accelerating. Any of you guys ever encounter such knocking sound? Please share.

Thank you.

fAT bENG

Mine is a bit different. While engine warm up and at idle, the front engine compartment will give out an occasional knock sound. Like metal nail hit metal surface. While moving, no such noise.

Sent to MA last time, they didn't feedback any issue. Suppose its no issue.
 

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