Ignition trouble shooting on Eurovan - Audi related

[Ben Swann]

I did not see good test for Hall and Coil in the Manual - maybe I overlooked that.
Difficult to turn engine over by hand since it is automatic - I can figure out how to do
this using socket if I have clearance and second hand - which is part of my problem when
trouble-shooting as I usually am by myself.

I was not aware of the EV groups - would be good to have something like Audifans.
Sambawas simply too big to narrow down on this.

Thanks - I'll look into the use groups as a resource since wouldn't be the first time I
had a quyestion unique to Eurovan.

Regarding what I am doing, I am really trying to use the Audi coils since I have them
and a bunch of other audis that all share the same coils.  They should work the same -
but there may be a difference in trigger/signal voltage coming out of the ECU.

Ben 

-----Original Message-----
From: radek at istar.ca [mailto:radek at istar.ca] 
Sent: Thursday, October 29, 2009 3:52 PM
To: quattro at audifans.com
Cc: benswann at verizon.net
Subject: Re: Ignition trouble shooting on Eurovan - Audi related

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