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Old 06-26-2002, 03:25 PM
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Join Date: May 2002
Posts: 27
W126 idle air valve - test

I am trying to fix a hard start/rough cold idle problem and from a search it appears one of the culprits could be a stuck idle air valve.

Is is a valid test of the system (and to test the idle air valve) to disconnect the idle air valve electrically and look for a noticeable increase in idle speed to 1500-2000 rpm???

I have done this and NOT noted the increase in idle speed and now am wondering if that is my problem.

Thanks.This is a 86 560SEL.
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Old 06-27-2002, 12:16 AM
Mike Murrell's Avatar
Registered User
Join Date: Feb 2000
Posts: 2,359
Curious myself. Went to SEARCH and keyed in:

*idle valve*

22 hits - some better than others. You'll need the CD-rom. It contains diagnostic methodology for this problem.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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