Noise under the car

[Ex-defender driver]

Hard to hear but at 4 seconds there is a double sound , it’s this sound. Listen, like a heart bit…
View attachment 7884159

Sounds like your bump stops hitting. There is very little upward motion of the axel before the bump stops knock onto their metal plates. Deep sand driving. Corrugations. Speed humps - all the same. Normal Bump stop noise.

 

[Tjeska]

We tried to make a few clips, on this one you can hear it the best: Video

From the drivers seat you would think that the noise comes from the right front of the car, from the passenger seat you would think it comes from the left side

It's definitely more of a ratle, some days it's gone, some days like today quite pronounced.

 

[grantcrawley79]

Hi guys

Got my Gren about a week ago and I noticed exactly the same issue - it's the like the vehicle has the spare tyre located at the bottom of the car, and it's not tightended properly - so every time you go over these speed bumps or gutters it feels like the tyre moves around below the car...

I'll check the sway bar bushes and propshaft sleeves.

Thanks

Hi guys, just a quick update again: I figured out exactly when the knocks down below occur: it doesn't occur when going over speed humps on level ground or downhill, because then the vehicle basically "coasts" over the bumps. When I go over a speed bump at a slight uphill, and I give it a bit of speed so that it coasts over the bump, there's no knocks. When I go over the same speed bump, but slower, so that the drivetrain has to work, then you can clearly feel the clunks/knocks, and whole family agrees, especially sitting on the rear seats. So it can't be suspension related, but rather drivetrain related, because it only clunks when the drivetrain is under torque. So it has to be either the drive shafts, or inside the transfer case. I checked the t/c mounting, hoping it might be cracked and moving around, but that also seems to be fine...
I'm now just driving it and waiting to take it in at the 30k service where I will demonstrate to the mechanic what's happening...
Surely this can't be normal...
Cheers

 

[grantcrawley79]

Hard to hear but at 4 seconds there is a double sound , it’s this sound. Listen, like a heart bit…
View attachment 7884159

Mine sounds exactly the same

 

[Powerven]

Hello everyone,

I’m experiencing a deep, heavy noise coming from underneath my car.

The tie rods have been replaced, but that wasn’t the issue (I was certain it wasn’t).

It seems more related to the suspension. It happens mainly at low speeds, particularly when going over speed bumps, often even more when descending them. It sounds like a “clunk, clunk.”
Cant’ really tell if it’s front, middle or rear…

I can also feel it slightly in the steering wheel and pedals.

Soon, I’ll be replacing the tires and springs (Eibach), but I’d like to identify the issue beforehand so no one blames the new springs for the noise, and I can still benefit from the warranty.

Occasionally, the noise also occurs at speeds under 40 km/h in corners when the weight shifts from one side to the other.

I suspect the shock absorbers or those large longitudinal crossbars.

Does someone have or had the same issue?
My Grena is 32000km, and it happened at 7/8000.

Thank you very much

Based on your description we had exact same issue -- transfer case cable retaining bracket failed cable slapping (known issue & 3rd party improved part fix on this site).

 

[bemax]

You might check whether the outer tube of the steering damper is loose. I had that issue but my one sounded more like a single „clunc“ sound. As their might be different stages of a loosing part yours might sound different.

 

[Tjeska]

Today I had my weekly special intimate moment with the Grenny, with other words I routinely check the car.

When I did the transfer case seal check I noticed that a cable had been rubbing on the front cardan shaft from transfer case to front axle...

Tried some zip tie magic to hold it a little away from the shaft for now, could this be the noise we where having...

 

[Logsplitter]

Today I had my weekly special intimate moment with the Grenny, with other words I routinely check the car.

When I did the transfer case seal check I noticed that a cable had been rubbing on the front cardan shaft from transfer case to front axle...

Tried some zip tie magic to hold it a little away from the shaft for now, could this be the noise we where having...
View attachment 7894194View attachment 7894195

Is that one of the transfer box Bowden cables

 

[Tjeska]

Is that one of the transfer box Bowden cables

It was the cable that made this Noise...

Will try do clear some time to make a brace for it so it cant touch the rotating assembly of the drive train anymore.

It's all a part of getting to know the car

 

[OZCC]

I have the dreaded clunk. I am told it is tie rod end and that there some evidence of metal on metal. I have this issue from about a week after picking up QM CC, now with 20k km on it I can confirm it is very annoying. Interested in others outcomes and fixes.

 

[Logsplitter]

I have the dreaded clunk. I am told it is tie rod end and that there some evidence of metal on metal. I have this issue from about a week after picking up QM CC, now with 20k km on it I can confirm it is very annoying. Interested in others outcomes and fixes.

My tie rod was easily rotated by hand early on in my ownership but I really am not sure whether it was fixed or replaced. It used to twist and clunk when turning and worst when axle articulated

 

[OZCC]

Your description is very similar to the noises I get. It does feel like I may have a drag link issue as well. I need to get a day where the sun is shinning and the ground is dry to get underneath and have a bit of a look see myself. I kinda resent the fact I need to work out myself.

 

[IneosGrenadierTech]

I've had something similar before, a vehicle had been away to have the steering wheel centred. Came back and had this clunk when going over bumps. I put it on the 2 poster, nothing. Went out, came back still the same. Put it on the 4 poster and there I could see the hanger for the steering damper was about an inch away from the diff plate. When the alignment had been done, the tie red had been rotated just enough to contact the diff when the suspension was compressed. Couldn't see it on my ramp as the suspension was allowed to hang too far down.