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Old 10-28-2003, 12:14 AM
ctaylor738 ctaylor738 is offline
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
It sounds to me like the lambda system is working. I would think that in that range the idle would be OK. You could have a failing idle air valve or vacuum leaks. Agree - change plugs back to copper.

You need a wiring diagram to figure out what the coolant sensor does. On the 380, the oil temp kicks the lambda on and the coolant sensor controls the idle.
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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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