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-   -   Loud Bang During Hard acceleration (http://www.bimmerfest.com/forums/showthread.php?t=670978)

Buzz110 01-19-2013 06:02 AM

Loud Bang During Hard acceleration
 
I have a 2006 X5 4.8is. During a hard acceleration from a stopped or rolling position my vehicle sometimes makes a load bang noise emitting from the rear. I have recently replaced the subframe bashing with polyurethane ones and also two rear differential bushings. Does anyone have any other suggestion? Are there any other common problems that I can look into?

TechWrench 01-19-2013 12:30 PM

Quote:

Originally Posted by Buzz110 (Post 7323820)
I have a 2006 X5 4.8is. During a hard acceleration from a stopped or rolling position my vehicle sometimes makes a load bang noise emitting from the rear. I have recently replaced the subframe bashing with polyurethane ones and also two rear differential bushings. Does anyone have any other suggestion? Are there any other common problems that I can look into?

Do a search on it, but it sounds like it could be the main drive chain inside the transfer case. It is a known problem with these chains stretching with time, and under acceleration they jump a tooth on the sprocket, making the noise.

Buzz110 01-21-2013 06:01 AM

Thanks I will definitely check that out.

HPIA4v2 01-21-2013 10:05 AM

Quote:

Originally Posted by Buzz110 (Post 7327096)
Thanks I will definitely check that out.

2006 X5 uses XDrive, no longer has chain in xfer case (those are for pre 2004 X5).

TechWrench 01-21-2013 03:10 PM

Quote:

Originally Posted by HPIA4v2 (Post 7327514)
2006 X5 uses XDrive, no longer has chain in xfer case (those are for pre 2004 X5).

Thanks, i have an '02, and didn't know about the change.

Buzz110 01-23-2013 06:58 AM

Any other suggestion then.

HPIA4v2 01-23-2013 09:25 AM

The common problem with X5 6-sp is bang noise during tak-off or stopping (like being rear ended from behind), dealer usually re-program the trans to smooth that transition.


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