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Old 05-23-2002, 05:05 PM
trintrick trintrick is offline
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Join Date: Aug 2001
Posts: 10
S500 idle problem

Sometimes on startup, usually when hot, my 95 s500 idle goes up to 1000 rpms then down to 0 and dies or stumbles back up to 700 rpms where it idles normal. I was told I need an idle speed actuator. What test should be done with the tester (HHT) to diagnos this problem or what should I check to make sure this exspensive part is the problem. There are no warning lights displayed while the engine is running. Thanks.
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