dontbirdme

Hi All,

I need help. My 01 E320 4Matic has this metal knock. I suspect it is metal because when I occassionally turn or go over a pothole/bump, the noise echos and lasts for half a second. I moved the exhaust pipe around but couldn't duplicate the problem.

Any takes or similar experience?

Thanks

SaMaS

Hi maybe one of resonatrors ?

RickyE430

I bet it's a cat. Dealer replaced mine under the emmisions warranty

dontbirdme

Thanks for the response.

I'm thinking, if it is the resonator or cat, shouldn't there be a sound even at idle?

The metal noise only occurs when I turn or hit a pothole, not when idling or going in a stright line without hitting potholes...

EdzBenz

You will hear a sound at idle as the cat deteriorates over time.

dontbirdme

The noise seem to be on the passenger side, and it seems to be coming from somewhere near the trunk. I had my cat replaced by the dealer 2 years ago already so it is not the rattling noise that i've heard of before. It sounds like a spring or a metal impact... not quite sure. I rock the car up and down but I can't replicate the noise...only on occassional bumps and turns. Any other ideas? Could it be a worn rubber spring stop or something?

EClass_VIP

It might be possible that your spring pad is worn out.