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Dwell / Duty Cycle Q.

Subject: Dwell / Duty Cycle Q.
From: hareless at gmail.com (Sean Whalen)
Date: Fri May 11 18:48:46 2007
In-reply-to: <4644F193.6050103@xxxxxxxxxxxxxxxxxx>
References: <4643C9E0.7010908@xxxxxxxxxxxxxxxxxx> <4643D5DA.9030909@xxxxxxxxxxxxxxxxxx> <c62998360705102001s47f91cc2m6b4ded153b2b9b33@xxxxxxxxxxxxxx> <4643F63B.3090808@xxxxxxxxxxxxxxxxxx> <c62998360705102202t27703e1w3e0a2292bb8193b3@xxxxxxxxxxxxxx> <4644F193.6050103@xxxxxxxxxxxxxxxxxx>

Hey Cam,

You shouldn't have the idle screw in all the way, otherwise there is really
no reason to have one.  The Teflon tape is working because it's around the
threads, that's why the screw bottoms before it's does anything.  Now that
you've backed it off the tape is essentially worthless, the compression of
the tape is what makes it work.  Of course I don't have my book with me
again, but are you supposed to unplug the NTC coolant sensor for this test,
I can't remember.  As far as the hoses, I think that's it; the Bentley is
just showing you a picture from an A-2, same difference.  In fact I think
you'd be a lot happier if your fuel system were on the passenger side; I
know I hated the Scirocco side on my Cab, it was way to tight.  One last
thing, are you absolutely sure your O2 sensor is functioning properly.  It
threw Gordy and I for a while with mine.  That and a broken wire to the
coolant sensor that looked connected because it was still inside of it's
boot.

Sorry to ramble on.  I'm just across the river in Parkrose if you ever need
a hand.

Good luck,

On 5/11/07, Camron D. Crouse <camron@xxxxxxxxxxxxxxxxxx> wrote:
>
> Okay, remeasured the Duty Cycle of the ISV with these changes:
> Distributor timing reset to 6* BTDC (I *think*, there's about three
> things that look like marks, and I cant tell which one it truly is),
> Teflon tape on idle screw and turned to full clockwise, large crank case
> breather hose disconnected at block (man, there was a lot of yellow snot
> in there!), and L nipple to the intake boot was stuffed into the test
> position.  A/F mixture reconfirmed at 10mA +/-1mA.
>
> The lowest reading I was able to get was 61%.  Hmmm.
>
> Maybe there is still another breather hose that needs to be pulled? As I
> said earlier, Bentley depicts a fuel-on pass. side engine, and the
> breather hoses don't correspond.
>
> Maybe I'm not using the correct timing mark?  There's 2 notches close to
> each other in the timing flash, then there's a little protrusion just
> CCW on the flywheel, and then there is "maybe" an o just CW of the two
> notches.  Can't quite see it straight-on as there are hoses and stuff in
> the way.  Bah!
>
> Maybe the teflon tape in the idle screw is not doing the trick?  When I
> unscrew (CCW), the idle speed increases (as does the Duty Cycle, up to
> about 75%), but seems correct at full CW.
>
> Other notes:  2.0 16V, Idle is stable, no hunting, exhaust is quite
> stinky (gassy) no matter my adjustments, my A/F ratio meter in the
> center console spends most time in Stoich (yellow), bouncing up from
> Lean (red), rarely goes into green (Rich).  If I lean out the A/F screw
> too much, the engine stumbles. TT fuel enrichment, TT Stainless 2.25",
> K&N filter... doubt these make a difference.  I am about to make a road
> test, then get DEQ-ed before the weekend.
>
> Last suggestions?  Thanks everybody.
>
> - Camron from Vancouver, WA USA
>    '86.5 Black 16V 2.0L
>
>
> ********************************
>
>
> Sean Whalen wrote:
> >
> > If I remember correctly, you need to pull the front PCV breather off,
> >  too.  My Bentley's in the garage, I'll go check. On 5/10/07, *Camron
> > D. Crouse* <camron@xxxxxxxxxxxxxxxxxx
> > <mailto:camron@xxxxxxxxxxxxxxxxxx>> wrote:
> >
> > Sean Whalen wrote:
> >> Yes, yes, and yes.  They're all dependent on each other.  A new
> > o-ring
> >> will make a world of difference.  Air can be your enemy.
> >
> > Thank you, thank you, and thank you!
> >
> > And what about the breather hoses - will the values be close enough
> > if they are in running position, or, if only the L nipple to the
> > intake boot is in the test position? I did get that to fit snug, ya
> > just gotta stuff it in there. Really I'd rather do it "right", but if
> > it's splitting hairs then no biggie.
> >
> > - Camron from Vancouver, WA USA '86.5 Black 16V 2.0L
> >
> >
> > ***************
> >
> >
> >
> >> On 5/10/07, *Camron D. Crouse * < camron@xxxxxxxxxxxxxxxxxx
> > <mailto:camron@xxxxxxxxxxxxxxxxxx>
> >> <mailto:camron@xxxxxxxxxxxxxxxxxx
> > <mailto:camron@xxxxxxxxxxxxxxxxxx>>> wrote:
> >>
> >> Forgot to add:  Checking the duty cycle of the *Idle Stabilizer
> >> Valve*... just to clarify.
> >>
> >> New info:  checked with hoses in place, the lowest value I
> > could obtain
> >> (via adjustment of the idle air bypass screw only, leaving
> > the A/F
> >> screw in the fuel dist. alone) was 66%, Bentley target is 26-30%.
> > Red probe
> >> on grey/white wire, black to ground.  I actually turned the
> > idle air
> >> bypass screw quite a few turns, and quite easily with my bare
> > hands...
> >> must need a new o-ring there? It is currently at full clockwise.
> >>
> >> Do I need to go back and readjust the the A/F screw on the
> > fuel dist,
> >> then check duty cycle again? Are these two adjustments interactive?
> >> And if I adjust the ignition distributor timing, do I start over?
> >>
> >> Thanks!
> >>
> >> - Camron from Vancouver, WA USA '86.5 Black 16V 2.0L
> >>
> >> ********* Camron D. Crouse wrote:
> >>> Checking duty cycle values for 2.0 16V Scirocco w/CIS-E
> > +TT fuel
> >>> enrichment module.  DPR current successfully set while at
> > full
> >> running
> >>> temp, 10mA +/- 1mA with a brand new auto-ranging multimeter.
> >>>
> >>> Trying to accurately check duty cycle.  Bentley describes
> >> disconnecting
> >>> crankcase ventilation hoses, but the illustration seems to
> > depict a
> >>> fuel-distributor-on-passenger-side setup, and the hoses
> > don't quite
> >>> correspond so I am unclear on which crankcase hoses I
> > actually
> >>> disconnect and at which points (Bentley illustration shows a
> >> ventilation
> >>> hose with a nippled T in it, but I have no such T).  In
> > addition,
> >> the L
> >>> nipple to the intake boot does not fit snug while in the test
> >> position.
> >>>
> >>> Do you folk make this check with hoses disconnected or in
> > running
> >> position?
> >>>
> >>> BTW I am going through DEQ tomorrow so that I can bring my
> >> registration
> >>> up to date.  Tuning for passing E-check, so stock settings
> > wanted...
> >>>
> >>> TIA!
> >>>
> >>> - Camron from Vancouver, WA USA '86.5 Black 16V 2.0L
> >>>
> >>>
> >>> _______________________________________________ Scirocco-l
> >>> mailing list Scirocco-l@xxxxxxxxxxxx
> >>> <mailto:Scirocco-l@xxxxxxxxxxxx>
> > <mailto:Scirocco-l@xxxxxxxxxxxx <mailto:Scirocco-l@xxxxxxxxxxxx>>
> >>> http://neubayern.net/mailman/listinfo/scirocco-l
> > <http://neubayern.net/mailman/listinfo/scirocco-l>
> >>>
> >>
> >>
> >> _______________________________________________ Scirocco-l mailing
> >> list Scirocco-l@xxxxxxxxxxxx <mailto:Scirocco-l@xxxxxxxxxxxx>
> > <mailto: Scirocco-l@xxxxxxxxxxxx <mailto:Scirocco-l@xxxxxxxxxxxx>>
> >> http://neubayern.net/mailman/listinfo/scirocco-l
> >>
> >>
> >>
> >>
> >> -- Sean A-1 x 2
> >
> >
> >
> >
> > -- Sean A-1 x 2
>
>


-- 
Sean
A-1 x 2

Follow-Ups:
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References:
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- Dwell / Duty Cycle Q.
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- Dwell / Duty Cycle Q.
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- Dwell / Duty Cycle Q.
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- Dwell / Duty Cycle Q.
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