[s-cars] cold starting problem again

[dgraber460 at aol.com]

Just as an FYI (I'm sure you already know) the switch is made of plastic and is a very weak point on these cars. Plastic has a _huge_ coefficient of expansion/contraction when compared to other materials.
Many years ago I had a 131 Fiat sitting outside on a particularly cold night (~18-20 below IIRC) and at 2:30 AM the horn goes off. The plastic that covered the steering hub had shrunk enough to?force the horn contacts together. Running out at that hour of night in 20 below temps to crawl under the car in the snow and disconnect a horn before the neighbors shoot you is no fun. FWIW that little Weber carbed twin cam motor would always start, unlike?a?#$%&#^ CIS fueled Audi.?


Dennis (no longer a CIS owner) Graber
Denver, CO


-----Original Message-----
From: Jerry Scott <jerryscott at wispertel.net>
To: David Forgie <forgied at shaw.ca>; s-car-list <s-car-list at audifans.com>
Sent: Tue, 16 Dec 2008 9:16 am
Subject: Re: [s-cars] cold starting problem again



Thanks Dave for your response.
One of the POS units is new.  The other one is only 4 years old.  I don't think 
that it is either of the POS units, since one of them would probably give spark 
to the plugs. None of the plugs are getting power, so maybe it is the switch.  
What should I read on the input (lower?) side of the POS units?  Now that it is 
running I can check with a VOM on the three terminals, then put it outside again 
and see what happens to that power.  Is that bus bar numbered so that I can find 
the right power terminal?  Do you think that the ignition switch could be 
sensitive to low temperature, since the problem always goes away with higher 
temperatures?
Jerry
  ----- Original Message ----- 
  From: David Forgie 
  To: s-car-list 
  Cc: jerryscott at wispertel.net 
  Sent: Tuesday, December 16, 2008 8:26 AM
  Subject: [s-cars] cold starting problem again


  Jerry:  From what you describe, power it NOT getting to either the coils OR 
the POSs.  Since both
  the coils and the POSs are powered off the bus-bar No. 15 terminal (under the 
driver's side knee
   bolster) which is switched power, you have to suspect: a) the ignition switch 
and/or b) the POSs
  (the coils are passive and are controlled by the ECU via the POSs)

  Reference Motronic Wiring diagram:  http://forums.audiworld.com/s4s6/msgs/206801.phtml

  Info on changing the ignition switch: http://forums.audiworld.com/s4s6/msgs/204624.phtml

  Info about the POSs and the fact that brown V6 ones can be used in a pinch:
  http://forums.audiworld.com/s4s6/msgs/149771.phtml

  Hope this helps.


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