cl500 probs

My car is a w215 2003 cl 500. After a 2 hour high way trip i noticed when i came to a stop i could hear a weird knocking noise coming from under the hood. When i accelerate it doesnt seem to be getting louder, its a constant noise, which seems to be coming from the front left of the car/engine. . It's hard to describe their for i made a video.
http://www.youtube.com/watch?v=1xbT8...ature=youtu.be

biker349

first i'd lubricate your belt pulleys and see if that effects the noise.

cl500 probs

You only hear at low rpms and when i start accelerating the (knocking) noise becomes more frequent but still at low rpms. If i accelerate further you can no longer hear it. Thanks in advance.

cl500 probs

video link

awiner

Check your idler/tensioner pulleys, especially the lower one on the drivers side of the engine.

They tend to go bad and break around 100k

cl500 probs

So you don't think it's the abc pump ? Mine went bad last year, started leaking and I replaced it with a used one.

cl500 probs

So you don't think it's the abc pump ? Mine went bad last year, started leaking and I replaced it with a used one.

cl500 probs

How can tell if its that ? Any ideas ? I precipitate your help btw. Cause u could be saving me a lot of money and time.

ctravis595

that is without a doubt the abc pump failing/running dry