YouTube What is this noise?

[Mook]

This has been the bane of my existence for almost a year now. It doesnt happen on cold start but becomes pretty consistent when the car is driven or has any heat in the engine bay. I've had the car at Komet a few times for go fast work and we've never been able to find the source or a problem. I've had the car at VW twice since Crystal Lake VW has been awesome about trying to get warranty work done even though I'm modded and BOTH times the car has been there, they could not get the noise to start up. The second time was last week and they even invited me back into the service area to sit and listen with the tech...they ran the car, drove it, etc...no noise. Naturally, whenever I drive it, noise is there.

I'm stumped on what it can be. And since the VW techs have only heard it in video, they cant figure it out....theyve run diagnostics, checked the engine over....everything looks fine.

Anyone have ANY ideas? I've thought alternator, tensioner pulley, another pulley someplace....no idea. I'm likely gonna leave it with Komet in August to try and solve it once and for all. Car drives flawless other than the noise.

https://www.youtube.com/watch?v=ofdf2tFC5Yw

Click to read more...

 

[Mook]

The sound IS somewhat random on when it will appear but its gotta more consistent with showing up daily as of late.
[MENTION=102]DanJoy[/MENTION], lets see if the great minds of TCG can figure this out.

 

[DEEZUZ]

No fucking clue

 

[DEEZUZ]

Some kind of surge no?

Is ac on?

 

[DEEZUZ]

Any driveability concerns? Erratic idle? Hesitation?

 

[Mook]

Car drives flawless, which is why I havent been too concerned...just super annoying.

 

[DEEZUZ]

You say when it's warm. I'd like to see the fuel trims and EGR actuation. See if the EGR is opening or some shit.

Makes this sound in gear too?

 

[Mook]

I've never noticed it on first start after it sits overnight.

Sound is there whether its in park, drive, neutral, reverse, whatever.

 

[Blood on Blood]

Install 300 shot
Drive to GLD
Send it


Enjoy the killer ETs

 

[DEEZUZ]

What motor/year/model is this? I'll check out some tech articles at work tomorrow

 

[Mook]

2016 Golf R, 2.0

 

[Ti28]

You talking about the "grinding" noise?

 

[Dasfinc]

[MENTION=5]Mook[/MENTION] as mentioned earlier - Is the A/C On?

our Cooper has an obnoxious noise/whine I can JUST barely hear, and figured out it was only while the A/C was on.

It almost sounds like your refrigerant could be low and its only when everything is super hot that its making surging sounds?

 

[Mook]

You talking about the "grinding" noise?

Correct, for lack of a better word.

[MENTION=5]Mook[/MENTION] as mentioned earlier - Is the A/C On?

our Cooper has an obnoxious noise/whine I can JUST barely hear, and figured out it was only while the A/C was on.

It almost sounds like your refrigerant could be low and its only when everything is super hot that its making surging sounds?

VW refilled it thinking that was the cause, it wasnt. Unless I'm somehow leaking it rapidly.

 

[IDAFC21]

Well that is strange.

 

[DEEZUZ]

Of course, I'd have to hear it in person. Even to isolate where it's coming from. Belt driven noise, chain driven noise, no idea.

Once you have the dealer have it over night they'll find it.

Sometimes I have to keep trucks for days to experience customer complaint

 

[Mook]

I'm gonna have Komet do the dsg service prior to driving to SC in Sept, so I'll let him diagnose it so I can then go back to VW.

 

[Blood on Blood]

Timing chain rub?

 

[01Cobra]

Trade in. Junk.

 

[IDAFC21]

LS swap would probably fix it.

 

[Mook]

OK. So I'm 90% sure its AC related. Heres what happens -

AC off, car idling, noise is there. Bring rpms up a bit to really hear it, kick AC on, noise goes away. Turn AC off, noise comes back. Tested this yesterday then again today with my mom working the gas and AC. The noise for sure vanishes once the AC is on...gotta call VW and pick their brain.

 

[Gone_2022]

You would think if it was a compressor type noise it would intensify when the A/C is on........ but maybe the clutch is dragging? (Ac clutch) slightly engaging for a second and releasing?

Honestly no idea.

 

[Mook]

this is the most encouraging lead ive had in months. im running with it

 

[Gone_2022]

I don’t know if your car has it but cars with VVT (variable valve timing) have had noises like this when there was an issue with the actuator.

Just random thoughts take them how you will.

 

[DEEZUZ]

Least you got your mom to help out, that's cool. Getting barn dog to do stuff like that is a pain in the ass