Humming/buzzing

Mar 2, 2004 | 06:01 PM

SLCPUNK

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Humming/buzzing

1994 c280 75k miles.

Sometimes when I put my car in gear it will make a humming noise. It won't do this when in N or P, but will in all other gears. It's almost like a humming/buzzing sound. It goes away in a couple of minutes once the car is warmed up. It has me concerned though because I know it's not going to go away on it's own. Last transmission/converter change was 10k ago.

Does anybody have any ideas what this may be?

Thanks

Mar 2, 2004 | 11:30 PM

GDawgC220

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From: Boston

'05 A4 1.8TQM6

Re: Humming/buzzing

Quote:

Originally posted by SLCPUNK
1994 c280 75k miles.

Sometimes when I put my car in gear it will make a humming noise. It won't do this when in N or P, but will in all other gears. It's almost like a humming/buzzing sound. It goes away in a couple of minutes once the car is warmed up. It has me concerned though because I know it's not going to go away on it's own. Last transmission/converter change was 10k ago.

Does anybody have any ideas what this may be?

Thanks

Is it like a "cycling" sound from the rear right of the car? There's a pump back there in the lining that makes that soun when your in any gear besides P and N. It makes that "cycling" noise then goes away after a little bit. Still haven't figured out what it is, I have my radio up anyhow, so I don't really hear it

But that seems to be normal on the w202s...goes away after the car is warmed up.

Mar 3, 2004 | 12:39 AM

pointman

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From: nj

a car that can't do the throttle reset.

ceramic monolith inside the exhaust sytem is breaking up... it is not really a problem unless the pieces get to large and restrict the exhaust.

Mar 3, 2004 | 01:31 AM

SLCPUNK

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Quote:

Originally posted by ahopeter
ceramic monolith inside the exhaust sytem is breaking up... it is not really a problem unless the pieces get to large and restrict the exhaust.

Why would the noise go away after a little bit ? And why only in gear , not P or N? Thanks.

Mar 3, 2004 | 01:32 AM

SLCPUNK

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Re: Re: Humming/buzzing

Quote:

Originally posted by GDawgC220
Is it like a "cycling" sound from the rear right of the car? There's a pump back there in the lining that makes that soun when your in any gear besides P and N. It makes that "cycling" noise then goes away after a little bit. Still haven't figured out what it is, I have my radio up anyhow, so I don't really hear it

But that seems to be normal on the w202s...goes away after the car is warmed up.

Hey GDawg. Only thing is that it hasn't made the sound before. Just recently.

Mar 3, 2004 | 01:37 AM

pointman

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From: nj

a car that can't do the throttle reset.

honestly i couldnt tell you...but i am confident that this is your issue. to verify, get underneath your car, better yet get it ona lift and hit the exhaust piping with the backend of your hand...run from the front end all the way to the back, at one point you will be able to replicate the noise.