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78' 450SLC
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101 Posts
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I have a 78' 450SLC with the K-Jetronic fuel injection, in the process of rebuilding the vacuum system i came across a line under the exhaust manifold that while running actually emits exhaust fumes. Any idea of where this line connects to? I have searched vigorously for a decent vacuum diagram and have came up dry.
 

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Always Remembered RIP
1979 280sl 4 sp w/ac 1957 MGA 1998 volvo xc/70 2004 F150
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6,050 Posts
EGR exhaust recirculation valve, but I don't know where it goes on your model.
 

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Always Remembered RIP
1979 280sl 4 sp w/ac 1957 MGA 1998 volvo xc/70 2004 F150
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6,050 Posts
The valve is vacuum operated so one side (probably rubber) goes to a temperature switch (only works whwn the car is at temperature) and the other line (steel) will somewhere go back to intake.
 

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1978 450SL--117K
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1,374 Posts
It sounds like my (same year) 450SL. the vacuum line runs up to the top of the engine in front and there is a vale there with two little steel tubes coming out of it that the vacuum attaches to.

If your PO was like mine, he probably just disconnected it when it stopped working. Mine does not leak exhaust though.
 

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R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
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32,348 Posts
Check the EPC. The diagram shows what is called a pipe that connects to exhaust cylinder #5. Does not indicate where it goes but that should be what you are referring to.
 

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1977 450SL
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257 Posts
One line from the EGR goes to a thermo vacuum valve (60) on the manifold. The other line goes to the exhaust pressure transducer (75) mounted on the driver side fender well right by the coil. This also is where the small tube from the exhaust manifold hooks up.
Here is the '77 diagram. I am sure 78 is very similar.
 

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