Any CIS-E III experts?

[Eric S]

CIS-E is knock sensing and has been used on 10:1 motors long before CIS-E
III was used.  Main difference between CIS-E and CIS-E III is the
potentiometer and its associated programming. IE, that is the only thing
added I can find.

Simplicity does not mean unreliability or "lack of ability to manage the
engine".

My question was specific, can I plug the CIS-E brain into the CIS-E III
wiring and have it work properly.  Not if this was a good idea. (thanks
for your opinion though).

-- 
Eric
www.vintagewatercooleds.com

1981 Scirocco S (TDI swap project)
1988 Audi 90 Quattro
1990 Corrado TDI
1991 Cabriolet (2.0 crossflow 8v project)

Ed Kellock said:
> The CIS III is paired with a 10:1 compression ratio.  Not sure the old
> system would be a great idea.  I believe one of the main reasons for
> the CIS III is its ability to sense knock and manage the engine.
>
> Ed
>
> On Fri, 29 Oct 2004 19:05:17 -0600 (MDT), Eric S
> <scirocco at vintagewatercooleds.com> wrote:
>>
>> Ok guys, my saga with the new 88 90Q continues.
>>
>> Massive intake leaks found and fixed (warped intake manifold if you
>> would
>> believe it was one of them)
>>
>> New O2, coolant temp sensors (both)
>>
>> Timing belt, cap, rotor, wires, plugs, ignition timing dead on.
>>
>> Sounds like it should run like a top now, right?  Nope, 2 codes left:
>>
>> Wide Open Full Throttle Switch
>>
>> Mass Air Flow
>>
>> The throttle switch has to be in the wiring or the brain itself, all
>> tests
>> check out per the bentley, but the ECU does think the full throttle
>> switch
>> is being triggered constantly.  (verified this with the DPR test)  I
>> have
>> managed to get the DPR to read around 0 while running (compensating for
>> the fact the ecu is trying to go full rich by adjusting the air flow
>> plate
>> position).  So, I am left with a high idle that the ecu keeps pulling
>> down
>> (up down up down).  And a car that is rather sluggish.
>>
>> The Air flow error really sucks, those potentiometers should not be
>> messed
>> with and are EXPENSIVE.  Same unit used on VWs CIS-E Motronic...had my
>> nightmares with those.
>>
>> So, my questions:
>>
>> Anyone run into the full switch senario before, even though the switches
>> all check out?  What did you do to solve?  I'm about to unplug the ECU
>> and
>> start checking continuity at the pins to the connector at the TB.
>>
>> The Mass Airflow....my mechanic (whom so graciously "assists" me in my
>> work at his shop) suggests I ditch the CIS-E III infavor of the older,
>> simpler CIS-E from say a Quantum Syncro.  He believes we can just swap
>> the
>> fuel dist and plug in the Quantum ECU to the CIS-E III harness and it
>> will
>> work perfectly.  Anyone done it?  Can you verify we won't have to swap
>> the
>> whole wiring harness?  Considering that potentiometer is NOT a seperate
>> replaceable part and you have to order the whole bottom half of the air
>> flow sensor plate, at $600, I am very interested in ditching this stupid
>> system.
>>
>> --
>> Eric
>> www.vintagewatercooleds.com
>>
>> 1981 Scirocco S (TDI swap project)
>> 1988 Audi 90 Quattro
>> 1990 Corrado TDI
>> 1991 Cabriolet (2.0 crossflow 8v project)
>>
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>>
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