Knocking from the rear SLS?

[BRABUS124]

I hear knocking from the rear at idle.
It raises with rpm in frekvens

 

[gsxr]

Check the fuel pump relay located under the rear seat, passenger side.

If the relay is clicking, your LH module needs to have the capacitors replaced.

 

[BRABUS124]

Check the fuel pump relay located under the rear seat, passenger side.

If the relay is clicking, your LH module needs to have the capacitors replaced.

Yes I did that seach here one time but it's more like a heavy knocking you can feel it in the I tire car. I beleave it's SLS related . If it is. What could make that sound. It's not hanging low or high. But it seams like the hydraulic is pulsating if you get what I mean

 

[gsxr]

Yes I did that seach here one time but it's more like a heavy knocking you can feel it in the I tire car. I beleave it's SLS related . If it is. What could make that sound. It's not hanging low or high. But it seams like the hydraulic is pulsating if you get what I mean

Not sure I've ever heard of that before. Can you post a video of the knocking noise? The SLS system should not pulsate.

 

[BRABUS124]

Not sure I've ever heard of that before. Can you post a video of the knocking noise? The SLS system should not pulsate.

Yes I will try that. But I've seen this before on a 124 300-24 with ASD. The hydraulic c pump presure line in the engine bay were pulsating. With led me consider if it's the return valve that are stuck so it's activation the over presure relief valve function instead. Same system is build in the SLS valve so that the presure is not blowing something as I recall.
I'll try take a video

 

[BRABUS124]

Video is to large?

 

[gsxr]

Video is to large?

Probably need to post to YouTube and add the link here... forum generally limits file size to something like 10MB, which is about ten seconds of high-rez video from today's "smart" phones.

 

[BRABUS124]

Here it is.

 

[BRABUS124]

I might think what if it's the tank ventilation system not working. Could that be the problem?

 

[gsxr]

Here it is.

That sounds like the exhaust pulsing - like there's a misfire occurring?

I might think what if it's the tank ventilation system not working. Could that be the problem?

Nope, shouldn't be related to the tank ventilation at all. The gas tank vents through a valve below the tank, into the carbon canister by the front wheel. Nothing in the vent system would cause a noise like this at the rear of the car. The purge "MOT" valve by the EZL does cycle but you should only hear that under the hood.

 

[BRABUS124]

I defently have a rough idle misfire. It goes away as soon as it gets above 1000 rpm
But that k locking sound is far from what I would ha øve considered as a misfire because from the ekshaust it dossent sound that bad