[W126 Coupe] Re:HI IDLE

[Jim Nowak]

The mixture screw can adjust the idle speed on the 560
SEC.  The screw makes contact with the cis metering
unit.  If you adjust the screw so the metering plate
is open further at idle, the engine will respond with
a higher idle.  I have to adjust my idle air speed by
the mixture screw since my differential pressure is
well beyond the factorys specs due to the added
supercharger system.
 
Dan's problem sounds like the idle air valve or a
vacuum leak like you said.

Jim


--- Sharan Bains <sharanbains@hotmail.com> wrote:

> The idle speed is all controlled electronically -
> the mixture screw will not 
> impact the idle speed.
> 
> Have you checked the bypass valve on the idle air
> valve - small plastic pipe 
> connecting the two main hoses ?
> 
> If that's leaky or come loose, idle will jump.
> 
> talbir
> 
> 
> 
> >From: "Dan Gardner" <cruftsk9@tpg.com.au>
> >Reply-To: mbcoupes@mbcoupes.com
> >To: <mbcoupes@mbcoupes.com>
> >Subject: [W126 Coupe] Re:HI IDLE
> >Date: Fri, 7 Jan 2005 20:24:10 +0800
> >
> >As this is my first post for the year"Happy New
> Year To Everyone"
> >
> >Since I have got my car running again I have
> noticed the idle speed has 
> >increase from 750rpm to 1200rpm,I have cleaned the
> idle air valve with carb 
> >cleaner and removed a lot of black carbon,having
> viewed the archives It 
> >would appear to have developed a vacuum leak or the
>  idle air valve has 
> >changed since cleaning.
> >
> >    I might use hose clamps on the push-on hoses
> just to make sure,the 
> >question is is it OK to adjust the idle screw or
> does that only change 
> >mixture,the cd-rom does'nt really specify.
> >
> >
> >                                                   
>                         
> >  Kind Regards  Dan Gardner    1986 560 SEC euro
> 220kw(300HP)
> >
> >
> >
> >
> >--
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> >
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> 
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