Vacuum Switchover Valves - Mercedes-Benz Forum
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post #1 of 2 Old 09-04-2004, 11:24 AM Thread Starter
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Vacuum Switchover Valves

I recently replaced the B2 piston in my 83 300SD. My next project is getting the vacuum system fixed up.

What Iím wondering is: Are the vacuum control valves located on top of the valve cover used ONLY for the ERG? After looking at the vacuum diagram i came to that conclusion, but I could be wrong.

Both of my valves need to be replaced, but if they only are used for the ERG i dont think i will replace them, because i see allot of people disabling their ERG. If i just block the vacuum from the supply to the valves can they just sit there and do nothing, or will this cause me other problems?

Any advice would be appreciated

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post #2 of 2 Old 09-08-2004, 10:56 AM
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I'm not crtain which valves you are talking about, but perhaps this link posted by RivermasterNC can help:

The EGR controls on my '87 were removed and performance was significantly increased.

\'87 Mer-B 300D (220,000 miles) (sold)
\'93 Mer-B 300D (173,000 miles) (sold)
\'87 Porsche 928 (101,000 miles)
\'98 Dodge Ram quad-cab (250,000 miles)
\'2001 CLK430 Cabrio (50,000 miles)

Past cars: 1969 mercedes 250, 1981 300D, 1972 220D
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