full thottle switch

[rocco_crossing at hotmail.com (Rhett Farnum)]

If it doesn't use the cold start injector why is my switch wired to it???



Peace Out,
Rhett
Rocco_crossing
'83 Rocco (autocross ready, tune up, install harness, and finally I may get 
to makeing it look better!!)





>From: "Dan Bubb" <jdbubb@ix.netcom.com>
>To: "Rhett Farnum" <rocco_crossing@hotmail.com>, <t.piwonka@ttu.edu>,       
>  <scirocco-l@scirocco.org>
>Subject: Re: full thottle switch
>Date: Thu, 18 Sep 2003 08:01:34 -0400
>
>It does not use the cold start injector!
>The cold start injector is used only when the engine is cranking (and not
>always then) and no other time.
>
>The full throttle switch increases DPR current on CIS-E (16V), which
>increases fuel flow through the normal injectors.
>On CIS-lambda (8V) it increases the duty cycle of the frequency valve again
>increasing fuel flow through the normal injectors.
>
>On CIS-lambda closing the switch almost always increases engine speed and
>smoothes out the idle (especially if you have a big cam) because the engine
>goes open loop (stops looking at O2 sensor output) and richens the mixture
>and most engines like to idle richer than stochiometric.
>NOTE: I guess this assumes your car is correctly tuned and FV duty cycle
>oscillates around 50% at idle.
>
>On CIS-E closing the switch again causes the engine to go open loop. DPR
>current is supposed to go to 16mA if engine speed is over 2500 RPM. On my
>car DPR current goes to a steady 8mA with the car idling. I'm not 
>absolutely
>sure how the engine will respond by closing the switch at idle. I would
>assume if the mixture is set at 10mA (Bentley recommended setting) then if
>it goes to 8mA by pressing the switch the engine will lean out a little and
>drop a few RPM. In any event I don't think it will make a huge difference 
>as
>long as your mixture is tuned correctly.
>Dan
>
>
> > It uses the cold start injector. If you ahve voltage that means you
>injector
> > is either shot or clogged. Try fom fuel inj. cleaner and if that doesn't
> > work replace. ~$5 at a bone yrd.
> >
> >
> >
> > Peace Out,
> > Rhett
> > Rocco_crossing
> > '83 Rocco (autocross ready, tune up, install harness, and finally I may
>get
> > to makeing it look better!!)
> >
> >
> >
> >
> >
> > >From: "Robert Piwonka" <t.piwonka@ttu.edu>
> > >To: "scirocco" <scirocco-l@scirocco.org>
> > >Subject: full thottle switch
> > >Date: Thu, 18 Sep 2003 00:48:07 -0500
> > >
> > >When I press the full throttle switch at idle should the car bog down?
> > >Cause it doesn't.  However I tested the voltage on the output and I 
>gets
> > >12v
> > >when activated and not 12v when not, so it appears to be working.
> > >
> > >Also how does the full throttle switch richen the mixture?  Does it
>change
> > >the dpr current or use the cold start injector or what?
> > >
> > >Thanks
> > >Robert Piwonka
> > >
> > >
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> >
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>

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