Reverse Gear Problem

[wolverine_77]

Hey Guys,
I have a 05' Z4 roadster, 2.5. I have been noticing since a couple of days that whenever i put my car into reverse gear and start backing up, there is a strange banging noise which i can feel. What i mean is its not only some sound coming but i can feel the banging vibrations! It really is scary at times. I dont have a damn clue about this. Has anyone faced this problem before?

[mas3423]

whats going on man, i started noticing the same thing with my 05 z4. at first i thought i ran over a huge pot whole. but its done it acouple times so far. not only does it do that, but it also makes a clanking noise when going from a stop to a roll either forward or reverse. im bringing the car in next thursday to have it checked out. any info please let me know. thanks

mark

[Reach]

Do you guys have manual or auto or smg? mas, is yours also a 2.5? how many miles? It would be good to be as specific as possible about these things so other could chime in, and it might help someone else down the road.

[mas3423]

Sorry, my car is a 2005 z4 3.0l with a 6spd manual. It has approx 16k miles on it. It has the sport package as well.

[MMMazing07]

is it coming from the tire/rear suspension? because i have heard this noise a couple times. Im thinking its the LSD

[mas3423]

Originally Posted by MMMazing07

is it coming from the tire/rear suspension? because i have heard this noise a couple times. Im thinking its the LSD

yea its definetly coming from the rear end of the car. it seems like the Z's arent the only ones having this problem. ive seen acouple post like this for the 3 series as well.

[wolverine_77]

yeah, mine is a 05', 2.5, manual 5 speed (obv since its 2.5 it is 5 speed). and i hav approx 34k miles on it. The sound is def coming from the rear, probably the suspension. But, my hunch is something is not right when the rear gear engages. It feels as if i am going over a big bump and a sharp one. I might take the car to a service center soon as well. Any1 has an idea vat cud be possibly wrong? Has any1 else dealt with dis and got it fixed?

[Reach]

Originally Posted by MMMazing07

is it coming from the tire/rear suspension? because i have heard this noise a couple times. Im thinking its the LSD

Only the Ms have LSDs. The 2.5s and 3.0s have open diffs.

[wolverine_77]

Hey Mark,
U said u have the same issue as of mine rite? I had a question. When u back up ur car, do u have ur foot on the brake too? I was just wondering if its the ABS. If it indeed is ABS then we are fine. Probably the ABS does this as a safety measure. For e.g. when u go down the hill and apply brakes in a continuum, u will feel as if the brake pedal is giving u jolts. My hunch is something similar to that might be going on. I am still not sure. I am gonna call up the service people and discuss with them about this. If any1 gets to know what really the matter is, plz pass on the info. Thanks for help in advance!

[mas3423]

To be honest with you, i don't remember if my foot was on the break when its happened before. but now ill definetly make notice of it, when it does do it.