Clunking sound when in reverse

[jackfor]

Hello everybody.
Just bought a 2002 Boxster man 5 speed. When I'm backing up there is 2-3 clunck sound, I put it forward and the samething happen. Once on the road there is no cluncking sound. I just remove the rear stabilizing bar to rule out this, but nothing change. Anyone had the same problem? The sound seems to come from the rear of the car. Help would be very appreciated.

This is a video I recorded with the clunking sound.

https://1drv.ms/v/s!AmSrLd3csx6CggFAnTHv-EqsHnrN?e=qhhYSP

[maxbottomtime]

Motor or transmission mounds?

[jackfor]

Is it difficult to check?

[Starter986]

Originally Posted by jackfor

Is it difficult to check?

For the transmission mounts look for hydraulic fluid on the ground directly under the respective mount, of which there are two. If it isn't leaking... another method might exist suggested by someone more knowledgeable than I.

Visual inspection of the motor mount.

Good luck.

[elav]

I would jack up the rear of the car and try to reproduce the sound by moving the tires. Could be CV joints.

[jackfor]

Thank you all for the replies.
There is no oil leaking from the transmission mounts. For what I can see the engine mount looks ok.
Could it be because one of the rear tire has less life in it than the other one.

When going in circle in reverse or forward it is worse.

I will try to raise the rear of the car to see what happen.

[blue62]

Originally Posted by jackfor

Hello everybody.
Just bought a 2002 Boxster man 5 speed. When I'm backing up there is 2-3 clunck sound, I put it forward and the samething happen. Once on the road there is no cluncking sound. I just remove the rear stabilizing bar to rule out this, but nothing change. Anyone had the same problem? The sound seems to come from the rear of the car. Help would be very appreciated.

If your car has the original motor mount then it is shot.
The rubber center portion wears out and degrades with age.
You can't see it with a visual inspection it has to be removed to see the problem.

Or you could have an issue with the rear axles bad CV joint or axle mounting bolts coming loose.

[jackfor]

I did raise the rear of the car but there is no clunking sound in reverse or forward.

[elgyqc]

Originally Posted by jackfor

I did raise the rear of the car but there is no clunking sound in reverse or forward.

My first guess would be CV joints. With the rear wheels in the air turn the wheels back and forth to see if there is a noise.
Where are you in Quebec?

[jackfor]

Originally Posted by elgyqc

My first guess would be CV joints. With the rear wheels in the air turn the wheels back and forth to see if there is a noise.
Where are you in Quebec?

My city is Dolbeau-Mistassini.

[elgyqc]

Originally Posted by jackfor

My city is Dolbeau-Mistassini.

C'est pas juste à cöté...

[maxbottomtime]

You could also look at the engine, see how much it shifts. Motor mount is easy to drop. 4x 15mm bolts on the bottom (nuts and studs that will likely come out together), few more on the front. Of course you need to support the engine.

You could try revving the engine (or having a friend do so) and watch for shaking/shifting.

[jackfor]

I reraise the rear of the car and move each wheel back and forth as elgyqc suggest. The rear right wheel has more slack than the other, but no clucking sound. The clucking sound seems to come from the right. I'm thinking buying a brand new cv joint to replace the right one.

[jackfor]

I bought a brand new right axel and installed it, the clunking sound was a little less presen but still there. Also replace the engine mount, nothing changed. I checked under the car with a friend during almost an hour, we did not find anything abnormal. Anyone has that problem? The infamous clunking sound is more present when in reverse and it sound like metal on metal. Any help would be appreciated.

[jackfor]

This is a video I recorded with the clunking sound.

https://1drv.ms/v/s!AmSrLd3csx6CggFAnTHv-EqsHnrN?e=qhhYSP