Audi 100 Won't Start: Breakthrough

[Marc Boucher]

Yes its the NF engine which is similar to the post 87 NF in the 5000.

You're completely correct - I did put resistors between pin 1 and 2 today
which solves the mystery of the cold start valve apparently not responding
to resistance changes.  I'm working from a Hayes for Audi 84 to 88 so I
picked up the term 'thermo time switch' as the means for controlling the
cold start valve.

While we're on the subject of changes from CIS to CIS-E-III...Hayes refers
to a 'warm up regulator' and by the looks of the photos its an integral part
of the FI system for the CIS version.  Does CIS-E-III have a warm up
regulator?  There's something on my engine where the warm up regulator would
have been,   with small vacuum hoses leading from the crankcase ventilation
and to the vacuum reservoir and an electrical plug and what looks like a
coil but I don't know what it does or if it is an integral part of the FI
system.

Marc

----- Original Message ----- 
From: "Edward R. Wendell IV" <erwendell at mac.com>
To: <quattro at audifans.com>
Sent: Thursday, January 29, 2004 7:08 PM
Subject: Re: Audi 100 Won't Start: Breakthrough


Ok, I'm assuming that this is a NF code 130hp engine. The reason I ask
is that I only have the 84-88 Bentley but I'm under the impression that
the engine in the 100 is the same as the 87-88 5000 with the NF engine..

  What you have been referring to as a thermo time switch isn't, at
least not when compared to the real thing on the early 80's CIS (K
jetronic) system. On your system CIS-E III (KE jetronic) the sensor on
the top of the water outlet is a dual NTC thermistor sensor. It's two
sensors in one housing. Pin #1 to ground supplies temp info for the
knock sensor control unit and pin #2 to ground supplies temp info to
the injection control unit. The reason that I point this out is that
I'm under the impression that you connected a resistor across the two
terminals on the connector. What you should be doing is connecting the
resistor between terminal #2 and ground. What gave me this idea is that
you measured 3.5k ohms on what you have been calling a thermo time
switch. Measured correctly (between either pin and ground) the most you
should have gotten was 2.5k ohms.

Not that this really matters. As you found out, your problem is not
with the cold start system, it's elsewhere. I'm just trying to
eliminate the mystery of the cold start system that doesn't respond to
temperature.

_______________________________________________
quattro mailing list
quattro at audifans.com
http://www.audifans.com/mailman/listinfo/quattro