Quote:
Originally Posted by Brian Carlton
Dave, on all SD's from '81-'85, the two vacuum switches on the top of the valve cover serve to operate the EGR exclusively.
They have no direct operation or effect on the transmission shifting.
I've recommended to everyone who has these engines to remove all the Tecalan lines that lead to and from the black box.
One line is the supply vacuum.........one line is the vent.........and the third line leads to the thermo vacuum valve in the thermostat housing and then onto the EGR valve.
These switches frequently leak and have an undesirable effect on transmission shifting however, they have no direct function reagarding control of transmission vacuum.
Please realize that older engines, prior to 1981, will likely have a different configuration.
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Thanks for the info.
Dave
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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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