Pull the connection from the idle control while the engine is running. If the idle doesn't jump up, that's probably your problem - either the signal to the idle control or the valve itself.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.

my 86 560SEL just started idling fast about 1200 RPM. fuel economy meter pegged to the left. i pulled the connector off the idle control air valve while engine running and the idle increased significantly

so ... does that mean air valve is OK or could there be issues with it.

a few days ago i sprayed the engine down with some water and degreaser just to clean it up a little. did i mess something up???

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R Martin
Dallas, TX (Addison)

86 560SEL, 128K

If you pull the connector off the air valve, and the idle jumps up, you valve and control are probably functioning.

With the engine running, spray gumout carb cleaner all around the air hoses on both side along the valve covers, and under the plenum where the cross hose goes. If idle changes while doing so, you probably have a leak in one of the air distribution hoses or one of the vacuum hoses.

All new air distribution hoses will cost you about 125 and an hour of work. Hopefully, you simply knocked a vacuum hoses off somewhere.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport

Good Job. You will probably find that lots of problems on W126 cars are caused by bad solder joints. I have seen them in just about every system.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition