The mas died in mine suddenly when I accidentally shorted the fuel pump trying to fix a fuel leak.

Well, that certainly would have been a quick death for it. However, it was aided by you. I'm talking about its death under normal circumstances like natural causes.

Normally it has a gripper and dies.

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I'm going to need a translation on that one. A "gripper"?

I just messed with this on a '91 300SL. The ECU controls the idle, but if it thinks the MAS has gone missing, it probably goes into a limp mode, fully retarding the timing and cutting off all power to the idle air valve. The MAS also powers the AC compressor.

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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

Grabbing one's chest and keeling over from a heart attack. Good o'l fashioned kicking the bucket.

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