CGT stalling when cold, I'm baffled

[Mike_Buckham at ptk.pioneer.co.uk]

Hi Jeroen,

I often got this with my '86 100 Avant. I believe that you may have an
intermittent connection on the temperature sensor that is located on the
top of the coolant connection on the front of the engine. The connector
easily corrodes and if it breaks its connection for even a moment, the
controller will stop the ISV from working until the ignition is switched
off and the engine is restarted. My engine also used to drop to about
200rpm, but I can't explain why your engine misfires. I suggest cleaning or
replacing the spade connector and maybe even re-routing a new wire all the
way back to the ISV controller.

Cheers, Mike.




From: "Jeroen Bruintjes" <brun at bart.nl>
To: quattro at audifans.com
Date: Mon, 20 Jan 2003 13:39:14 +0100
Subject: CGT stalling when cold, I'm baffled
Reply-To: brun at bart.nl

I have a very weird problem with my Coupe GT (KV engine, 1985-spec,
CIS but no O2-sensor). On cold or wet days, it starts just fine with
a flick of the key. Idles perfectly for about one or two minutes,
then suddenly idling speed drops to about 200, where it keeps
seesawing. Also, it seems to lack power and misfires under load when
cold.

Cleaned the ISV. Changed it for another from the big box o' spares.
Cleaned the injectors, checked the cold start injector. It's got new
spark plugs, brand new plug wires+distributor+distributor cap.
Checked the fuel pump and cleaned all contacts to sensors and relays
around the engine.

To get the picture: I pour all my money into this car to keep it in
perfect condition, so it's not a problem of bad maintenance. I'm
baffled! It doesn't always show this behaviour, more like every three
or four days. After a couple of restarts, the problem is gone. I
suspect two things: the warm-up regulator or a bad ground connection
somewhere. Anyone? Please please pretty please?
--
Brun uit/uut/aus/from/de Amsterdam.
Met een dakje op de u!
brun at bart.nl