Strange sounds after going off throttle

[SteveH]

Nice! that really does sound like a steam train

[minim]

Well I don't hear any nose from it

There is a lot at 9-12sec and 20-24sec. Almost like a steam train

[newsh]

Well I don't hear any nose from it

How about noise??

[4WDrifter]

Well I don't hear any nose from it

[minim]

I nearly had it lol. My tray is secure with cable ties.

Glad it's sorted, it's always a worry- unusual sounds.

Enjoy now.

Yup It's the simplest things you look for last..

I was thinking to fix a little part that was broken with some epoxy/fibers and then make some metal mountings that reach into the front bumper. Do you get it tight enough with cable ties?

[4WDrifter]

I nearly had it lol. My tray is secure with cable ties.

Glad it's sorted, it's always a worry- unusual sounds.

Enjoy now.

[minim]

A bit embarrassing since I should have seen this before but the tray below the engine was installed with 3 of 15 bolts/nuts and none of them in the front. The tray has then prolly been pushed down by the wind once I got up to speed and made this sound. There is no holes in the front of the bumper for fixing the tray so I will have to make something that fits between the tray and the bumper so it can be fitted properly. Had a testdrive without the tray mounted now and it's silent

[minim]

Today I removed the two covers above the exhaust that covers the driveshaft going from rear diff -> front. It doesn't show that the driveshaft have touched the cover and I cannot see any wear/marks on the shaft that indicates that this is what making the sound. It's a nightmare working below the car since I'm not able to get it up in proper working height so before I spend more time under it looking in the blind is there any other spots I should look at? I did not see anything on the front pulley when I checked it.

[minim]

Finally back home but came home finding that my RS2 was in day to day use cause my allroad had a stuck front brake caliper so I didn't get to check more around this problem yet One thing I did get from this was when I was picked up in the RS2 yesterday and not driving it myself I could hear that this sound came at around 90km/h and when I told the driver to clutch out and play with the rev's the sound still was the same. Leads me to thinking that the sound is coming from somewhere in the drivetrain!

Just waiting on parts so I can assemble the allroad again and get the garage ready for the RS2 and I'll look into what this thing can be.

[minim]

Yes it is in the v belt pulley. The larger diameter end had moved forward up against the back of the intercooler.

I will try to post some pictures though I'm not too computer savvy.

Great. If you can't get them uploaded you couald also mail them to me if that is easier. Would be great to know what to look for

[4WDrifter]

Yes it is in the v belt pulley. The larger diameter end had moved forward up against the back of the intercooler.

I will try to post some pictures though I'm not too computer savvy.

[minim]

If something is rubbing centre driveshaft it will be obvious as you will see rings on it where coating is rubbed off

Ok. Thanks for the tip.

Starting to get a nice list now and I'm already looking forward to get started On the car

[Thecrispynoodle]

I only listened to the video last night, was at work during day - I agree that sounds mechanical not airflow related. Drivetrain mount issues will cause all manner of off-throttle weirdness but normally clunks not continuous noises have you checked centre driveshaft for nearby loose heat shield etc? Worn rear diff mounts allow a lot of unwanted movement IME and you hear it most when off throttle at speed.

If something is rubbing centre driveshaft it will be obvious as you will see rings on it where coating is rubbed off

[Thecrispynoodle]

I only listened to the video last night, was at work during day - I agree that sounds mechanical not airflow related. Drivetrain mount issues will cause all manner of off-throttle weirdness but normally clunks not continuous noises have you checked centre driveshaft for nearby loose heat shield etc? Worn rear diff mounts allow a lot of unwanted movement IME and you hear it most when off throttle at speed.

[minim]

I listened to your video

Check that your crankshaft pulley isn't split and that it is not hitting against the back surface of the intercooler.

I know this is a completely different tack to all that has been said so far but I had the same sort of noise and crankshaft pulley had split and the front part had moved forward to hit the back side of the intercooler (I have an S2) luckily no permanent damage done. I can't believe how lucky I was the get a second hand replacement pulley within an hour of posting on the wanted section. Put the car up on a lift, remove the drip tray and if the pulley looks okay then I'm sorry for wasting your time.

What do you mean by split? I did change the cambelt pulley when I changed cambelt on it recently. I have just used the car for 10km after the change do it could be that something is off there. Do you mean the V-belt pulley or the cambelt pulley? If it's the v-belt pulley was it split in the vibration damber? I tightened the pulley to the correct torque and applied threadlock so I would truly be amazed if the bolt managed to get unscrewed.

Don't worry about me wasting time Love working on the car so all ideas and suggestions are welcome!