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#1
11-26-2006, 11:54 AM
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I have a whirring air pump now
No whistle today, instead it makes a whirring noise when running. Impending doom? What happens when it dies?
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL 
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#2
11-26-2006, 10:49 PM
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Will
I guess that the bearing of the pulley is on its way out. You could remove the pump and replace the bearing. If you wait for it to fail completely it might block the polyrib-belt, leaving you stranded. Good luck, bruno
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_ 1992 300TE 160 kmiles
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#3
11-26-2006, 11:39 PM
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My smog/air pump on my 300CE is making a whirling noise also. But it is only during the few minutes after startup and then it stops.
From what I understand, the clutch mechanism needs to be replaced. You can see them at mbpumps.com. When I asked the owner if just replacing the clutch was a good idea (save a few bucks), he said that was the cheap fix since there are another 2 sets of bearing in the motor itself, so you might as well get a rebuilt pump where all the bearings have been done. glenmore 1991 300CE 2000 C280 1990 LS400
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#4
11-27-2006, 08:49 AM
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AFAIK the secondary air injection pump on your W202 is electric, not mechanical (belt driven). The W124's have belt driven ones. I don't think you've got a pulley on yours, so I don't think the bearing is the right diagnosis.
I've had the same problem with my C280 now for two and a half years. The pump makes noise for the first 45-60 seconds after starting and then shuts off. I'm just living with it.
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Jonathan 2011 Mazda2 2000 E320 4Matic Wagon 1994 C280 (retired)
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#5
11-27-2006, 05:26 PM
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Ok, thanks
Yeah, I think it is electric, and it's been doing strange things for 2 years. The whirring is new. I'm guessing the worst I would get is a check engine light when it goes south.
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#6
11-27-2006, 08:04 PM
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I've had the CE light for two and a half years now. I read/clear codes every so often just to make sure I don't have any other codes hiding there. I just can't justify the expense for what the part does.
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Jonathan 2011 Mazda2 2000 E320 4Matic Wagon 1994 C280 (retired)
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#7
11-28-2006, 02:30 PM
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Thanks, exactly what I was thinking. $400 for something that decreases emissions at startup. I'm all about being green, but.......
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#8
01-16-2007, 11:04 PM
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Quote:
I have the same sound, I think. It lasts for a few minutes at start. Sometimes there is no sound. Do you have the same? Jason
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1988 300CE 120K RIP(Midnight Blue/Parchment) 1987 300E 202K (Arctic White/Palomino) Now I see the secret of the making of the best persons. It is to grow in the open air and to eat and sleep with the earth. ~Song of The Open Road
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