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Old 11-11-2001, 03:47 PM
Registered User
Join Date: May 2001
Posts: 301
420SEL whirrling /humming sound

On the first start of the morning there is a low pitch whirling/humming sound comming (I think) from the passenger side of the engine compartment. It is easy to hear,it sounds as though it's speed is tied to rpms and it stops suddenly after a min. or so. Has anyone else had this occur?
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Old 11-11-2001, 04:10 PM
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Join Date: Aug 2001
Location: At Sea
Posts: 1,729
could it be the air pump? i think that's normal...
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
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Old 11-11-2001, 05:44 PM
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Join Date: Jul 2000
Location: Toronto, CANADA
Posts: 1,193
It is the air pump, but the noise it not normal. If you can hear it than it is on its way to the junkyard. The air pump is part of the emissions control system and generally only operates the first little bit until the exhaust warms up. I had to replace the air pump on my 420SEL, and its not a cheap part. I bought a used one from an auto recycler for 1/2 the price and the an MB dealer installed it for me. Everything is working fine.
Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired
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Old 11-11-2001, 07:25 PM
Dennis Taylor
Posts: n/a
I had my air pump rebuild a month ago in California for $80 including shipping.
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Old 11-11-2001, 09:19 PM
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Join Date: May 2001
Posts: 301
Thank you gentlemen.

Dennis, please let me know who did the rebuild for you as I am also in CA

Also, where is this pump and is it belt driven?

Last edited by fredsegal; 11-11-2001 at 09:25 PM.
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Old 11-11-2001, 10:31 PM
Dennis Taylor
Posts: n/a
The place was on the web or 1-800-745-1531. It was approx one week turn round.

The pump is low down below the alternator and has a electric clutch like the air conditioner. The overhaul did not include the clutch.

I have not re-installed it back on the car yet, but it was frozen solid at removal.
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