CIS-E 3 problems continued...frustrated.

[Denis]

  Mine does that too sometime. 
  But i m taking break from trouble shooting. I solved couple problems but i m tired ofCIS  now. It runs pretty good but still bounce around 1100RPM sometime.

  I nplugged the ISV cause when it bounce it goes from 900 to 1500RPM. Without ISV it goes from 1000 to 1100. Its intermitent.

  I unplugged the OX, no change

  Ðenis
    ----- Original Message ----- 
    From: Eric S 
    To: quattro at audifans.com 
    Sent: Sunday, February 13, 2005 5:27 PM
    Subject: CIS-E 3 problems continued...frustrated.



    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)

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