[Vwdiesel] 1.6L cold start-idle speed?

[Shawn Wright]

The later pumps had a two stage cold start - 1st stage is timing advance, 2nd stage 
is an idle boost of a few 100 rpm. The early pumps were just the advance only. You 
can actually feel the 2nd stage in the later pumps - a slight "detent" when pulling it 
out. Both my 1.6NA '85s have the single stage, my later TD engine has the 2 stage. 
I'm not sure when the change occurred, probably '87 or so.

On 10 Nov 2004 at 10:08, Smith, Michael <Michael.Smith at rvh.nb.ca> wrote:
> 
> Hmmmm....that's funny.  On my 88 Jetta there was a definate increase of idle
> speed when you pulled the cold-start knob out.
> Aprox 200rpm or so as I recall.
> 
>   Guess I'll just leave it alone for now, until I figure out if the beast
> will pass a safety inspection.  Then I'll start tinkering
> with things like that.
> 
> Appreciate the info !
> 
> Mike
> > -----Original Message-----
> > From:	Marcel [SMTP:mygroups at websworld.org]
> > Sent:	Wednesday, November 10, 2004 9:41 AM
> > To:	Smith, Michael
> > Cc:	'vwdiesel at vwfans.com'
> > Subject:	Re: [Vwdiesel] 1.6L cold start-idle speed?
> > 
> > Smith, Michael wrote:
> > > 
> > > I was monkeying around with my cold start knob (at the pump end) and
> > didn't
> > > find any difference in idle speed moving the mechanism back and forth
> > about
> > > 3/4" in either direction. 
> > 
> > That lever does not affect idle speed, it affects timing only.
> > 
> > I don't even notice ANY difference from the knob on my car except it 
> > starts easier and smokes a LOT less on cold starts with the knob out.
> > 
> > There may be a very slight difference in "diesel-noise" too (smoother 
> > with the knob in when even slightly warm, smoother with the knob out 
> > when cold) but that might be just my imagination.
> > 
> > Marcel
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--
Shawn Wright
I.T. Manager
Shawnigan Lake School