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Old 09-11-2006, 05:38 PM
david s poole david s poole is offline
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
surging idle

ooops silly me i assumed[there's that word again]that you knew about the automatic idle valve on the engine and this is controlled by the large relay under passengers feet.this is more common than the valve itself.other thing is the overvoltage protection relay which supplies pwr to the idle valve control unit.this relay is under the hood not far from the brake booster,next to two other bigger relays in front of windshield.my gut feeling is the idle speed control unit because if the ovp you should get at least one other lite pop up on instrument panel.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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