New thread - same question - WHAT??!

[Sleipner]

What is this noise? I'm trying to pinpoint it and for me it sounds like transmission, however it has just been in for a check and adjustment and the noise came back so i guess it's something else.

Have tried to rock the tires with them in the air but can only get a slight little "ping" from right side (this is actually where the main noise comes from when inside the car) but it didn't move or feel loose at all. Can it be the wheel bearing anyway?

First, the metallic clunk came when matching rev and speed while engine braking. When the "break" released, the clunk appeared. Later it came when starting at first gear from a stand still or reversing (one clunk) but now, lately its this rattle rather than a single clunk and it has been increasing rapidly over a few weeks...

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[gmupatriot]

Sounds like the driveshaft has slack in it. But that's just a wild guess.

 

[Sleipner]

Sounds like the driveshaft has slack in it. But that's just a wild guess.

Yeah, but when I've lifted the car some days ago, the entire shaft seem rather "solid".
The rather large play in the drivetrain is much better since they shimmed the differential a few weeks ago due to the noise and in my ears it's rather distinctively coming from the right side, but has also started a bit from left recently.

As you can hear it's also three consecutive "knocks" now. I've could have accepted it being the driveshaft if its only as it was in the beginning with a single knock when the drivetrain passed the "neutral" position in regards to torque from fwd to rev. (that was also my theory) But also then, the "thud" came when slowly and carefully started from standstill with a constant stress on the drivetrain... So... That would in my mind eliminate the play in the shaft...? It's quite frustrating

Now its also coming when accelerating out of turns which was not the case before so I guess I'll have to buy a floor jack today so check the wheel bearings as lifts are quite scarce 5 days before summer tires needs to be on and people are off work

 

[MKMotorsport]

A random thought is it could be the limited slip. They can groan or chatter, I notice you have the car turning in an arc and you mention coming out of turns- that's when you might notice this. Factory diffs really shouldn't do that though. Does it make the sound in a perfectly straight line?

 

[Sleipner]

A random thought is it could be the limited slip. They can groan or chatter, I notice you have the car turning in an arc and you mention coming out of turns- that's when you might notice this. Factory diffs really shouldn't do that though. Does it make the sound in a perfectly straight line?

Yeah my initial theory is that it's some slack in the diff, however they tor it apart and adjusted the backlash (allegedly) but the noise has returned worse than before.

First it came, as described elsewhere, when cruising and engine breaking. When the speed matched the rpm and the break "released" there was a clunk why I thought it was something loose in the diff/drivetrain.

The noise is both when starting straight ahead and in an arc, however from the rear left side and not right after I borrowed a second pair of ears yesterday after checking all torques (including hub nut).

This is from rocking left wheel back and forth. Noise is from the left outgoing diff shaft / cv joint-area. If I wiggle the cv joint by hand, I can feel a 1mm play in what i assume is the bearing on the diff.

 

[GT Pony]

This is from rocking left wheel back and forth. Noise is from the left outgoing diff shaft / cv joint-area. If I wiggle the cv joint by hand, I can feel a 1mm play in what i assume is the bearing on the diff.

Is the shaft that actually goes into the differential moving that much? Of is it just a lot of play in the CV joint itself?

 

[Sleipner]

Is the shaft that actually goes into the differential moving that much? Of is it just a lot of play in the CV joint itself?

I would say the play is between the shaft and diff or the bearing in the diff. CV joint/shaft seems good from what I could tell.

If i start jerking the right side wheel only, the play tightens and is slightly moved to right side but not nearly as bad. So for me it seems like the play in the diff is way off, however, they said all is good after rebuilding it but......

It hasn't been like this for the first 28k km so how it suddenly would be normal the last 2-300km and increasing fast is beyond what I can understand and it's not acceptable for a new USD 50k car that I haven't beaten whatsoever.

 

[Sleipner]

Took it out for a spin on some nice winding forest roads and noticed, after it's warmed up, that I heard a "ticking" noise similar to gravel in the wheel bay from the rear right... So... Wheel bearing?

The main cracking noise when maneuvering fwd/rev though is from left side (confirmed) however the ticking/gravel noise from right might be a hallucination and really originating from the left...?

A new thing that happened today was that the single "knock" now also occurred a couple of times when accelerating steadily on 3rd gear out of a turn (right hand turn i think) and was not just from starting from stand still.

When I came back to the garage I shot the video below, now with steering wheel hard to left, then hard to right and then straight ahead just for reference. It seems at first as it's worse while turning left, but then... Well... Listen.

And as a bonus, there are now up to 5 knocks whens starting from standstill and not just 1 or 3!

 

[GT Pony]

I would say the play is between the shaft and diff or the bearing in the diff. CV joint/shaft seems good from what I could tell.

If i start jerking the right side wheel only, the play tightens and is slightly moved to right side but not nearly as bad. So for me it seems like the play in the diff is way off, however, they said all is good after rebuilding it but......

It hasn't been like this for the first 28k km so how it suddenly would be normal the last 2-300km and increasing fast is beyond what I can understand and it's not acceptable for a new USD 50k car that I haven't beaten whatsoever.

From the trouble-shooting you have described, it seems like it could be something in the differential. If you can't feel any play at all in the wheel bearings or CV joints in the half-shafts then it seems the differential is the culprit.

I'd take it back to the dealer that did the rebuild and see what they say. Could be it was setup slightly wrong and took awhile to show these symptoms.

 

[Sleipner]

From the trouble-shooting you'd described, it seems like it could be something in the differential. If you can't feel any play at all in the wheel bearings or CV joints in the half-shafts then seem the differential is the culprit.

I'd take it back to the dealer that did the rebuild and see what they say. Could be it was setup slightly wrong and took awhile to show these symptoms.

They shimmed the diff a couple of weeks ago and then it was fine for a day or two before starting developing into this which is more or less "more of the same as before", so it might as well have been the general setup with shafts etc that needed som time to wiggle loose again after having it off but yeah... They'll just have to find what's wrong and fix it.

Man, I just love having my car in the workshop all the time!

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