CIS-E 3 problems continued...frustrated.

[Eric S]

Symptoms:

Poor cold start (very low idle)
Once warm, idle gets too high and ISV keeps it from going over 1100 rpm
(bounces).
Codes being thrown: Air flow meter and Full throttle switch shorted/open.

What I have done:

Noted that full throttle switch works perfectly in open loop mode (warm
up), once up to temp, it is ineffectual (does not change DPR current/bog
the engine with too much fuel like during warm up).

Unplug the idle/full throttle switch once warmed up, idle goes up to a
steady 1400 rpm.

Replaced Air flow meter with known good tested unit...no change.

My questions:

I am really confused that during open loop mode the car properly responds
to the full throttle switch, then when in closed loop ignores it and
throws a code.

Air flow meter...what could cause the computer to think its signal is bad?

I suppose the bentley would be more revealing, as I could check resistance
of the pins at the ECU...but that whole full throttle switch thing has
gotten me thinking that its very possible all wires are good, that its the
ECU at fault here.

What all do you guys think?  Any further troubleshooting suggestions?

New parts so far (related to injection anyway):
air flow meter unit
ISV
O2
Coolant temp sensor
Full throttle switch

This system has re-affirmed my hatred for CIS-E in general...would
appreciate any help here.

-- 
Eric
www.vintagewatercooleds.com

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