Any CIS-E III experts?

Ed Kellock ekellock at
Fri Oct 29 22:06:37 EDT 2004

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.


On Fri, 29 Oct 2004 19:05:17 -0600 (MDT), Eric S
<scirocco at> 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 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
> 1981 Scirocco S (TDI swap project)
> 1988 Audi 90 Quattro
> 1990 Corrado TDI
> 1991 Cabriolet (2.0 crossflow 8v project)
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