Ignition trouble shooting on Eurovan - Audi related

[radek at istar.ca]

Hi Ben;

First of all, do you have a Bentley for the EV?  If not, I can scan  
pages for you, there are procedures there for testing the Hall and the  
coil.

Second, are you aware of the EV groups:  ev_update at yahoogroups.com and  
93eurovans at yahoogroups.com?  These groups are not nearly as technical  
as audifans, but there are knowledgebase articles available and I  
think ignition problems are well represented.

Let me know if I can help.

Radek
93 EV
91 V8Q
88 90Q

------------------------------

Message: 2
Date: Wed, 28 Oct 2009 21:22:07 -0400
From: "Ben Swann" <benswann at verizon.net>
Subject: Ignition trouble shooting on Eurovan  - Audi related
To: <quattro at audifans.com>,        "'200q20V mailing list'"
         <200q20v at audifans.com>
Cc: 'Ben Swann' <benswann at verizon.net>
Message-ID: <002301ca5836$3b8e9a00$0201a8c0 at swansong>
Content-Type: text/plain;        charset="iso-8859-1"

I have a '93 Eurovan with 5 cyl. - just died one day.  Ignition  
related and I've
confirmed weak or no spark from coil.  I rewired it to fit an audi  
coil with Darlington
transistor - similar, but uses a larger plug, but same three wires.   
Figures VW used a
different combination/connector, but for all intent and purpose looks  
like just a
variation on the theme.

So after testing the Eurovan coil for spark and getting a weak spark  
then rewire and
substitute the Audi coil  - Now I find zero spark on the AUDI coil  
assembly  - I at
least saw a weak spark on the VW one, so trying to see if I need to  
revert or I can use
one of these  ones that I have  a half dozen or so.

Here is the question - What is the switching voltage on the center pin  
(2) usually green
with whte stripe wire and comes off the ECU?

I'm being a little vague here because the same coil setup - darlington  
transistor
adjacent to coil with 3 pin connector is used on several of the AUDI  
models including
200Q20V, Coupe Quattro and late 200 (MAC-14) as well as 100 with NF  
engine and others,
so the pin on the ECU may change, between ECUs.  On '90 model 80 it is  
pin 11 on the ECU
and on '90 Coupe Quattro is pin 9A.  MAC-11 on 5000tq uses a 2 pin  
connection, so not
working with that one.

Anyway I'm

(1) trying to test some coils to see if they are good and with +12V on  
pin 1 of
connector and  pin 3 to ground  - what is min.  voltage  required to  
trigger the coil?

And (2) trying to see what Voltage I am getting out of the Eurovan ECU  
if possible/ and
what voltage is should be putting out in case I need to amplify the  
input voltage a
little - I'd like to stick with the AUDI coils since I have plenty of  
them and the VQ
one looks like it was designed for planned obsolescence - I digress.

I know I ought to test Hall output, but difficult on this vehicle so  
may be going in a
roundabout way - I presume if I was getting any spark from the ECU on  
the Eurovan, then
hall signal was present anyway.

Ben

"Basic research is what I'm doing when I don't know what I'm doing"   
Playing with
flashlight battery and coil combinations in the garage while holding  
one end of spark
plug in my left hand =0