I have tried twice, both times unsuccessfully to get the switch out with the throttle valve on the manifold. It's not that big of a deal to remove the air guide, except that you really need some force to get the collar off the throttle valve neck. Once you've done that, the throttle valve comes off easily. Be sure to check the air guide for cracks, and you may want to replace the band and lock that holds the collar to the throttle, as well as the vacuum line connectors.
Since you've got the injection mostly undone, this would be a good time to do the injector seals as well. Cheap.
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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
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