[W126 Coupe] Re:HI IDLE

[Sharan Bains]

Jim,

Yes, with your set-up, it can make a difference and may be used to make the 
difference.

But what should happen is that once the mixture is set via that screw 
(anti-clockwise to lean, clockwise to rich) then idle should be @ 550 +rpm 
in 'P' or 'N'.

If the idle is higher orlower than this, then there is an issue elsewhere 
that needs to be addressed. High idle should not be resolved by playing with 
the mixture screw (except perhaps on your supercharged machine). The idle 
control unit governs the idle through collection of a number of parameters.


talbir



>From: Jim Nowak <jjnowak_32503@yahoo.com>
>Reply-To: mbcoupes@mbcoupes.com
>To: mbcoupes@mbcoupes.com
>Subject: RE: [W126 Coupe] Re:HI IDLE
>Date: Fri, 7 Jan 2005 06:23:49 -0800 (PST)
>
>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)
> > >
> > >
> > >
> > >
> > >--
> > >No virus found in this outgoing message.
> > >Checked by AVG Anti-Virus.
> > >Version: 7.0.300 / Virus Database: 265.6.8 -
> > Release Date: 3/01/2005
> > >
> > >The MB Coupes Website!
> > >W126 SEC Mailing List
> > >Postings remain property of MB Coupes, L.L.C.
> >
> >
> > The MB Coupes Website!
> > W126 SEC Mailing List
> > Postings remain property of MB Coupes, L.L.C.
> >
>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.