Lately, I've been having a very loud noise that rumbles the dash upon boosting 2-3k RPM that both myself and passenger says is coming from the driver's side in the engine compartment.
It ONLY happens sometimes when going up a hill, not all the time. As soon as I let off the accelerator, it will stop. If I hit the accelerator the same way while not on a hill, I only hear the typical turbo spool and no problem.

Anyone have any idea what it could be?
2001 1.8t A4 Auto Quattro.

My engine was replaced recently and I never had this problem before that.

Thanks!!

 

does the car run rough when this happens?

 

I never really let it keep making that noise to see if it was running rough. I always quickly took my foot off the gas so it would stop.

Why? what would that mean?

 

Bump...

There's no loss of power just a loud vibrating noise on the drivers side ( opposite side of the turbo) when the car is under load on hills--only sometimes though.

Any ideas?

 

If its a quattro, I wonder if the limited slip AWD discs in the transfer case are going out for some reason.

 

its very hard to say, maybe any other descriptive words to use?

 

i have the same problem its only at WOT under heavy load i can tell where its coming from though but its only at low rpms. i dont take my foot off the gas it goes away after it passes 3k and i have had no ill effects of ignoring it so thats exactly what i do

 

Next time it happens, I'll keep my foot on the gas and see if it stops after 3k.

How long has this been happening?

 

ever since i started running 24 pounds through the chip, n75 race, and diode mod combo