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#1
10-13-2007, 10:55 PM
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What is this part, and why does it buzz?
What is this part, and should I be concerned that it makes a loud buzzing sound and that I can feel a vibration from it when I shut off the car? This lasts about 2 minutes after shutting the car off. Markings on the black plastic read "VAC" and "EGR". The part is located in the front of the engine compartment on the passenger side. See related thread here.
__________________
1984 300D Turbo 163k. 
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#2
10-13-2007, 11:14 PM
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It looks to be a vacuum control valve, and your over-boost solonid to the right of it. (not my era car, someone back me up)
I would check all line with a mity-vac. Are you experiencing any hard shifts?
__________________
-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)
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#4
10-16-2007, 12:30 PM
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I'm wondering about that part myself. In another thread, someone said it was a nonessential component that regulated the EGR Valve.
Mine is marked with ATM on the side of disk part. So I thought it had some bearing on the transmission.
__________________
___________________________ 1995 E320 (2009 - current) 1985 300TD Turbo black (2007-current) 1983 300TD Turbo red (2008-2009) 1972 280SE (2004-2007) 1977 300CD (2003-2004) 1976 240D (1999-2003)
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#5
10-16-2007, 01:10 PM
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Brian said it was okay to remove mine when I was cleaning out all that stuff. I don't have any vacuum whatsoever on the right side of the engine bay now, and all the devices that could conveniently be removed easily have been removed.
My shifts, for the record, are uniformly rough. Mityvac shows only 7.5 inches leaving the modulator (blue flying saucer on left fender) to the transmission. When I manually gave the transmission 10 inches with the mityvac, my shifts were plenty smooth. Wherever I'm losing those inches of vacuum, however, I don't think it's related to removing those components. Engine doesn't seem to care.
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 ~Michael S.~ Past cars: 1986 300SDL 1987 300SDL 1982 240D 1982 300SD Current: 1987 300SDL
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#6
10-16-2007, 03:05 PM
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The large one runs the EGR valve; the small one next to it runs the Air Recirculation Valve (ARV). Both can be removed and the lines plugged. If one or both have vacuum leaks, your transmission won't shift correctly. The ARV itself is part of the turbo casting and can be plugged but not removed; the EGR can be removed and it's hole blocked off.
Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#7
10-16-2007, 08:46 PM
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Quote:
__________________
Dale http://i52.photobucket.com/albums/g1...MG_2277sig.jpg 1990 300D 2.5 Turbo -155k 2000 E430 - 103k 2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k 2014 VW Passat TDI SE - 7k Bro's Diesel 2006 E320 CDI - 128k Pop's Benz Pre-glow - A moment of silence in honor of Rudolph Diesel
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#8
10-16-2007, 09:08 PM
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if its diesel get rid of anything that even seems emissions related. (aside from the alda, it improves gas milage)
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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