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Old 12-07-2010, 03:09 PM
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Join Date: Oct 2006
Location: Indian Waters, Florida
Posts: 136
High idle.

1991 420SEL. High idle problem. Searching different sites for this problem and it always comes to Aux. Air Valve sticking. Seen picture of one but, don’t think mine has one. At least I don’t recall seeing one. Is there one and where would it be located?
Just replaced injectors, and holders. Removed , cleaned (really coked up) and replaced all intake manifold soft bits.
Replaced all vacuum lines and rubber ends.
Cleaned idle control valve and start injector valve.
Deleted AIR and EGR systems.
Lamda check, and fuel distributor controls checked SAT.
No vacuum leaks.
Runs smooth now but, high idle. About 1100 RPM when warm.
Thanks for any suggestions.
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