TEAMxREX

When ever i turn left or right there is this knocking noise coming from the back right of the car and i have a few ideas what it could be. But i need a nother opinion on what it could be.

salimshah

FWD or AWD?

Salim

TEAMxREX

It is AWD.

SC400slide

iTrader: (11)

maybe hitting a piece of plastic sticking out, like dust covers.
Could also be wheel bearings...?

TEAMxREX

I was thinking it might be ball joint because i also notice it makes a noise sometimes when i go over small/medium bumps.

hypervish

There are no ball joints in the rear.

The noise you may be hearing over bumps could be a strut mount.

TEAMxREX

Sorry i just thought there was.......and its not the bearings i just jacked the car and wiggled the tire there was no movement.

salimshah

Try out on a smooth surface ... to eliminate some of the possibilities.

If you see the problem in turns and you have AWD, I would say start by servicing the rear diff.

Salim

TEAMxREX

But if it is the diff wouldn't i lose power?

TEAMxREX

And i checked the service mannual and it seems to be that the diff oil hasnt been changed since 06 so can that cause the feint knocking noise?

salimshah

You get most of the power to wheels front the front.

In turn, the rear diff gets stressed, and that is the reason I mentioned rear diff. If it is locked, then the one wheel ends up skipping.

Salim

TEAMxREX

I respect that you are helping me but the car drives and runs great and it has no.problems except that noise i hope its not the diff.

salimshah

My advice is worth the money I get

There is a simple test for diff, but we can get to it when you think it is worth pursuing.

If you can add more symptoms may be some one can make a better guess.

Salim

01rxwhite

Diddo on the differential. If it's been since '06, you need to change the fluid out regardless. It should be relatively easy to do yourself and inexpensive. It might eliminate the knock if it isn't damaged. I'd start there. I change out the differential fluid on my MDX every 30k miles.

hypervish

X3, go ahead and service the differential. It needs to be done anyways, and we can eliminate that possibility.

Also, I agree it would help if you could describe it more. Because basically, at this point, all we know is that there is some sort of knocking noise, coming from the rear. Not much to go on.

Can you try rocking the car left and right from the back? While doing this can you hear the knocking noise?