Hello,

Ive been racking my brain with this issue for months now. AT high RPM's (1500-2000 or so) when the car is put into drive or reverse there is a loud growling noise from the engine compartment. It happens when the car is still and moving. ONce the rpm's kick down to normal operating temperature it mostly goes away. Car has about 80k on it now.

I replaced one of the serpentine belts (dayco poly rib) and the tensioner about 1.5 years ago with a Dayco - 89356.

Seemed like it worked fine for a while, months. Then started getting the noise. There was no noise before this. I started replacing other parts to try and stop it to no avail. The rear mount was busted so I replaced all four with anchor brand from Advance Auto.

Other things repaired:

Cleaned throttle body and MAF sensor

Plugs and wires

Intake Manifold gasket Victor reinz MS19590

Cleaned and verified PCV valve working.

Some of these things were done to fix the Too Lean code which has subsided.

I started thinking it was the tensioner again a bit ago. I know there seems to be quite a bit of deflection in the belt. I have tried loosening the belt and putting the tensioner through its motions slowly a few times to see if there is an air bubble but that hasnt worked. When the car was running I was watching the tensioner climb up and down. I wasnt sure how normal that was though.

I'm in the windy city and well, it was pretty windy this morning.

First part is car started cold in park. Second part is car in drive .

took the belt off and checked all the pulleys for ease of movement and all were silky smooth. The idler pulley on tensioner spinned smooth but there was a little bit of play laterally. About 1/32, maybe 1/6. Not alot but I was able to move it laterally some.

ANy advice is greatly appreciated. Thanks in advance