2.0 4cyl Idle control (3A Engine)

[Alan Pritchard]

Generally the usual approach to rectifying idle on these systems is as
per how you have described, firstly checking timing, by setting the
ignition timing to its static mode by fitting the fuse in the relay, or
by doing the paper clip jumper trick on the connectors under the dash.
Then by plugging the breather system.
A good check is to check for breather/intake leaks by removing the oil
filler cap, which should generally change its idle or cause a stall. If
this does not happen this could indicate a vacuum leak or compensation
for the above by altering the idle micture.
After that a sensible approach is to clean the isv and check its
operation. 


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R&M Electrical Group
Alan Pritchard
Network Administrator
Units 1 & 2 362 Spring Road
Southampton,Hampshire,SO19 2PB
mail: alan.pritchard at rm-electrical.com
www: www.rm-electrical.com
tel: +44 (0) 2380 686610
fax: +44 (0) 2380 685673
mob: 07870 164812

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-----Original Message-----

From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
On Behalf Of Robin Hodder
Sent: 12 December 2006 10:24
To: Quattro
Subject: 2.0 4cyl Idle control (3A Engine)




	Hi gang,

	Wondering if anyone out there is an expert in the series III
coupe with the
2.0 4 cyl engine - code 3A.

	I was looking at this car (my brothers ) at the weekend. The
setup seems to
be KE jetronic
 (CIS-E? in US) with lambda control , and non-integrated Motronic
ignition.
Idle control is by the familiar ISV system.

   So it seems to that ignition timing is controlled by rev-counter
style
monitoring (no crank sensor), hall sensor and knock sensor. We had a
problem
with pinking which I cured by resetting the ignition which had too much
static advance, so I assume that the system is not able to retard beyond
a
certain point.

   This seems to be exposing a fault with the idle control as it now
idles
very low. Idle switch and ISV check out ok. Can anyone confirm the
components of this in the KE setup? - Is it by a big relay like in the
non-E
systems, or is it in the ECU for the lambda? my next step will prolly be
to
monitor current thru the ISV but I'd like to know where the control
system
is.

  TIA Rob.

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