My 280C had an EGR valve installed when I first got it, but the line that went to the exhaust was not connected to anything. In fact, there was nothing on the exhaust to connect it to. Then I looked at the valve, which was completely plugged, which was good because the entire bottom of it had corroded away. I debated about this and then went to the dealer and bought a plug for the threaded hole in the intake manifold behind the carb where the pipe screws in.

This is a BIG plug - like 25mm. It is either #16 or #18 on the Group 14/1 picture. It needs to plug the hole where #61 in 14/2 goes.

I have not noted any problems attributed to the missing EGR valve, but since the engine was dead when I got the car, I have no benchmark.

And are you in luck if you want to replace it! Check this out on e-Bay:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1846254282

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe