Re: fuel mixture

[Gary Huff <scirocco86@home.com>]

ISV duty cycle. It's something you measure of a test lead in the engine compartment near the ignition coil. It's the amount of time the idle stabilizer valve spends open IIRC. On a duty cycle meter it should be between 26-30%. You adjust it by turning the idle air bypass screw in the back of the intake. Once this is set, put a fair amount of blue RTV in the idle air bypass screw hole to seal it, as the o-ring in there is completely shot most of the time. Next set the ignition timing, and then set the dpr current. They must be set in this order, trust me I learned the hard way. The reason ISV duty cycle is important is because the DPR is regulating/correcting the amount of fuel given to the motor for the air that is allowed to pass into the motor by the ISV. Hope this helps. Peace,
	-Gary Huff

2000 Golf GLS 1.8T
1986 16v Scirocco <-- closer to running properly....
1975 Scirocco
On Mon, Jun 25, 2001 at 11:00:58PM -0400, S.Coleman wrote:
> Gary,....can you explain this "idle stabilizer valve duty cycle" bit.  I
> swear I haven't ever done this.  (doh!)
> Thanks,
> Chris
> ----- Original Message -----
> From: "Gary Huff" <scirocco86@home.com>
> To: "Brad Sayer" <vwrocco85@hotmail.com>
> Cc: <scirocco-l@scirocco.org>
> Sent: Monday, June 25, 2001 10:31 PM
> Subject: Re: fuel mixture
> 
> 
> > 10ma is what the 16v Scirocco should run. Set it to 5ma if you like more
> mid-range pull, but slightly less low end torque. Don't forget to set idle
> stabilizer valve duty cycle, and timing first though....
> > -Gary Huff
> >
> > On Mon, Jun 25, 2001 at 07:18:30PM -0400, Brad Sayer wrote:
> > > Ok, so now another person has told me that the fuel mixture on a 16V
> should
> > > be set by getting 5ma at the differential pressure regulator (DPR).
> But, I
> > > just read the hole section in the bently and it says 10ma (in 2
> different
> > > places, no less).  This is for a CIS-E 16V as per the usual
> > > Scirocco/Cabriolet Bentley manual.  Could a GTI 16V be 5ma while a
> Scirocco
> > > 16V is 10ma?  That would explain the confusion I believe.
> > >
> > > Which is right: 5ma or 10ma?  Its a pretty big difference.
> > >
> > > Brad
> > >
> > > 87 16V
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