[s-cars] Diagnosing misfire cause

[manuelsanchez at starpower.net]

Tom, 


I'm curious, what were the shops test results and/or how did they determine that the ECU Ignition Module was at fault. 


I'm just hoping to store this nugget of info for when "my time" comes around. 


Thanks. 


Manny 


95.5 urS6 Avant (RS2'd) 

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Message: 1 
Date: Wed, 20 Jan 2016 18:39:35 -0500 
From: "Tom Rodriguez" <trodri69 at gmail.com> 
To: <s-car-list at audifans.com> 
Subject: Re: [s-cars] Diagnosing misfire cause 
Message-ID: <006501d153db$d2fb68d0$78f23a70$@gmail.com> 
Content-Type: text/plain; charset="us-ascii" 

Folks, 



My shop has traced the misfire to a faulty DME Ignition Module. This is a 
Bosch Motronic unit, part no. 4A0907551AA. Audi wants $2,500 for a new one. 
Any suggestions on where to get this part for less money? 



Thanks a bunch, 



Tom 



Tom Rodriguez 

'95 S6, 267k miles 



l engine speeds and 
under all levels of acceleration & boost, including at idle. On some days 
the car starts well and runs well for a while, then begins misfiring once 
warm. On other days it misfires when cold, and then clears up once warm. 



I've read the technical advice provided at SJM Autotechnik on this subject, 
which points to either a bad ignition coil, a bad POS, or a bad fuel 
injector. They also mention dirty plugs but mine look fine. 



My problem is that every time I try to diagnose the cause, the engine 
refuses to misfire. When it does misfire, I am not in a place where I can 
do any diagnostics. It's very frustrating. I'm hesitant to drive the car 
any long distances until I figure this out. 



Thanks for any advice, 



Tom 



Tom Rodriguez 

'95 S6, 267k miles 





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