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Dwell / Duty Cycle Q.
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
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>>>
>>
>>
>> _______________________________________________ Scirocco-l mailing
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>>
>>
>>
>> -- Sean A-1 x 2
>
>
>
>
> -- Sean A-1 x 2