CIS IIIe diagnostics etc

[Denis]

  You can plug direct to the fuel pump relay too.
  http://www.sjmautotechnik.com/trouble_shooting/100ecuf.html

  works good.
  Did on my 100Q 1989 and 90 1988.

  I wired a led ( upper left on second figure) and a switch parralle to the fuse plug on the top of the fuel pump relay.
  Can send you the complete wiring if u want.
  My light is now located on the dash where the Check engine light goes.

  Ðenis
    ----- Original Message ----- 
    From: David.Payne at brinksinc.com 
    To: quattro at audifans.com 
    Sent: Thursday, March 24, 2005 8:34 AM
    Subject: CIS IIIe diagnostics etc 


    I'm trying to read the codes on a 1989 90q.  The build date is 04/89.
    According to the Bentley CD the '89 models (49 state) don't have a Check
    Engine bulb installed and you use a diagnostic plug under the dash instead
    of fuse in the fuel pump relay.  I can verify that the check engine bulb is
    either missing or burned out, but I can not find the plug that Bentley says
    is there.  Can anyone give me a closer location other than drivers side
    under dash?
    I'm trying to trouble shoot a couple of ongoing problems with this car.
    Things that I know or have done:  New (last 10k miles) injectors and
    mounting hardware, all new ISV plumbing, new CIS boot, thoroughly cleaned
    ISV (this week), newish (last 20k miles) cap, rotor, plugs, wire, temp
    multiswitch.  While the car is warm and running I get 13v on pin 2 going to
    the ISV (this is a two pin ISV) which makes me think that will open the
    ISV.  Plugging the ISV in or out makes no difference, leaving the ISV
    plugged in or out makes very little if any difference in the way the car
    drives.  Triggering the WOT switch makes no difference in volts going to
    pin 2, unplugging the 2 pin temp switch (on a warm engine) makes no
    difference in idle or volts on pin 2.  Can someone explain the ISV circuit
    logic to me?  The Bentley CD is a little vague.
    To compound the problem I have a vacuum leak that shows up once the engine
    is hot.  It sounds like it is coming from the intake manifold right were
    the ISV hose goes in.  Squeezing the hose feeding the ISV closed makes the
    leak go away and almost kills the engine at idle.  If I crack the throttle
    slightly, I can hold revs and get the leak to go away by squeezing the
    hose.  Soaking the area with brake cleaner will eventually get the revs to
    go up.  I want to have a better idea of what's going on before I pop off
    the top of the manifold because then I won't be able to run the engine.
    Anyone had problems like this before?
    Last problem (that I'll talk about today) is an intermittent lean condition
    at WOT.  It gets lean enough to get a good hesitation, but most of the time
    it pulls strong.  I don't know if the lean out is related to the ISV issues
    or not.  I would think that since the ISV air supply is downstream of the
    air flow sensor that even if it was wide open all of the time the fuel
    would be compensated.
    Sorry for the long post but I'd really like to put some of these issues to
    bed.  I love this car when it's acting right and have invested enough in
    Bilstein's, H&R's, etc. to try to get some enjoyment out of it, and besides
    it's cheaper than $350 a month for a Imprezza or Mazda 6 wagon (just a few
    of what I'm currently Jonesing for).
    Thanks, Dave.

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