CIS-E potentiometer repair/replace

[Phil Payne]

> The only experience I have is with playing around with some Audi 5-cyl
> CIS-E and E3 pots one day.  Made a test connector so we could measure
> the resistance while raising the airplate, just for fun.

We did this on four MB ur-quattros about five years back.  I've got Audi's calibrated
plate-raising tool and we were interested in the way fueling works on the MC - it's an MC-1
with the smog stuff deleted.

It turns out that plate movement stops at around 4500 rpm - all extra fuel from that point on
comes from the ECU increasing the fuel frequency valve duty cycle to lower the pressure in the
lower half of the metering head.

Anyway - a piece of information garnered: the potentiometer is INCREDIBLY precise.  We had
multimeters that read to 2% and all four were within that tolerance.

-- 
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803