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Old 12-14-2002, 07:45 AM
Registered User
Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Talking rythmic buzzing sound in the rear boot

When I joined this forum 6 months ago, I asked for help regarding this noise, but no one came forward with a practical solution. The noise starts immediately the engine is started and goes on for about 5 to 10 minutes. Irritating to the passengers and driver, but not loud. Happens everytime, any time of day. Now I have this solved by my techie here who went through almost all of the vacuum lines around the car and found that it was the diaphrams , 1 single and 1 double which had ruptured. He tested them with a hand pump with a pressure gauge. The only noise that comes from the rear pump now is the first buzz and then silence for the rest of the journey. Problem solved! This also solved the rear headrest being stuck upright and now they come down at a push of the button. My left outside RV mirror has been changed outright and colour coded to the body colour. This was damaged by previous owner who did a cover job that wasn't too impressive. I've resprayed my front bonnet(hood) and the bumper, side mouldings and some minor panel work . The only other job now is to replace the whole exhaust system which is making too much noise due to ? damaged insides and non-OEM parts. Will look at the engine to see if it needs a fix next year. I've spent too much already on this car. Can't get it to go any faster due to its "tiny" engine. Any suggestions like using a power chip???

1994 C180 Euro 190,000kms and still going strong. Looks more like a 1 year old car.
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Old 12-14-2002, 02:46 PM
haasman's Avatar
Registered User
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097

Thanks for the update. Those are the kind of repairs that drive us all crazy trying to find out what is wrong.

I had a car that had a buz from the rear. Checked inside the trunk, exhaust system, speakers, etc etc etc .... turned out my son (about 6 at the time) pointed out one of the license plate screws was not tight and allowed the plate to vibrate, but only when I sat in the driver's seat! Funny .....

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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Old 12-14-2002, 11:28 PM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Thanks for the follow-up. It helps to know the cause and solution.

It also gets me to thinking. I noticed today while tooling along in a moment of solitude that I heard the vacuum pump run about 3 times (5 seconds or less) during a 40 minute trip. Thinking I have a door acuator on the way out. Probably wouldn't have given much more though until it was running constantly. Thanks.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
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Old 12-15-2002, 12:45 AM
jbaj007's Avatar
Registered User
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
The outcome on our solved problems is so important to report because it is then in the archives for all of us. Thanks, Hockey.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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