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Old 10-01-2003, 06:51 PM
ctaylor738 ctaylor738 is offline
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
If the coolant sensor test fails, the book says to connect 12V to the idle valve for 5 seconds. If the engine slows way down or dies, replace the idle relay. If it does not, replace the idle valve.

Did you ever check the voltage to the valve?
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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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