Audi 4kQ- hardstart

[Stott Hare]

You may want to re-read the Bentley schematics.  If you trace back the Cold
Start Valve wiring on the 4kq, you will see that it originates at the
switched power post on the starter solenoid.  The one that is triggered when
the ignition is turned to the start position.  BTDT with a tricky 4kq that
lost it's CSV.  Turns out a faulty reman starter was the problem.  Starter
solenoid would trigger the starter, but not pass power on to the CSV
circuit.  Replace the starter again, and voila the cars starts on chilly
mornings once again.

HTH,
-S

Stott Hare
85 Callaway 4ktq
85 Cannonball 4kq
89 100q
89 200tqa

-----Original Message-----
From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
Behalf Of Ti Kan
Sent: Sunday, November 11, 2001 2:46 PM
To: VW FREAK
Cc: Audi Mailing List
Subject: Re: Audi 4kQ- hardstart


VW FREAK writes:
> what do you mean spare fuse? which specific fuse do you refer to? I had
not
> changed anything in the fuse box prior to this problem, but I have not had
> the car long and it is possible someone else did. The idle stabilizer DOES
> have power, but unplug it and the car idles exactly the same.
> Ken N

The "spare fuse" is fuse location 24 on the fuse/relay panel, second
right on the bottom, horizontal row.  It's not always labeled as having
any purpose, and since pretty much all other fuse locations in that
row have no function, people tend to think that it's a spare.  It's
in fact the power supply fuse (10A) to the CIS ECU.

You say you have power to the idle stabilizer valve (I presume to the pin
with the black/blue wire), then it means that fuse 24 is good.  However
in order for the ISV to function it's gotta get signals from the ECU
(the other two pins).

The thermo-time switch and cold start injector gets its power on the
CIS-E cars from the ECU too (the pin with the red/black wire at the
respective connectors).  But, as I said, only during cranking.  Maybe
there is a bad electrical contact at the connector on the ECU?  It's
mounted under the dash on the side of the glove box.  You'll need to
remove the glove box to get to it.

This is stuff that you really need a wiring diagram to troubleshoot.
The Bentley manual has all that.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
--
    ///  Ti Kan                Vorsprung durch Technik
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