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Old 08-15-2002, 03:25 PM
Registered User
Join Date: May 2001
Location: Indiana
Posts: 206
C280 switch-over valve

I recently got the Check Engine light on my C280 and took it in to the shop I usually go to and had it read. He didnt give me the code but said it was common for the switch-over valve to cause the EGR valve error and that he would reccomend changing that first, if the CE light came on after replacing the switch-over valve then the EGR valve would be replaced. Does this sound like the correct way to approch it? Also, since I'm starting to do a little more of the DIY work, is the switch over valve something I can do on my own?

1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)
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Old 08-15-2002, 03:40 PM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
I doubt it is a bad SOV.
However , it is possible..
More likely it is a plugged egr pipe to the intake [common prop on 104 eng]
There is an article on it in the DIY section and the Search Archives.

An easy test is to apply vac to the egr [ hand pump/mighty mac/etc] while at idle. Eng should run rough w/vac---smooth out as vac is released.
A SOV test is to look for vac at the line to the SOV and the line from the SOV to the EGR.
Common prob in this area would be the plastic line feeding the SOV [ under front plastic eng. panel] becomes brittle and crack...
[ thus, no vac to SOV]
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Old 08-15-2002, 03:48 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
202's also crack the vacum block on the r/h fenderwell area under the big plastic module cover.

Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
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