[s-cars] Diagnosing misfire cause

Wed Jan 20 17:00:10 PST 2016

Why didn't they just call it an ECU and tell you to find a used one .... They're usually $300-$400

Oh wait...

----- Reply message -----
From: "Tom Rodriguez" <trodri69 at gmail.com>
To: <s-car-list at audifans.com>
Subject: [s-cars] Diagnosing misfire cause
Date: Wed, Jan 20, 2016 6:39 PM

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

From: Tom Rodriguez [mailto:trodri69 at gmail.com] 
Sent: Wednesday, December 30, 2015 6:32 PM
To: s-car-list at audifans.com
Subject: Diagnosing misfire cause

Folks,

My '95 S6 is misfiring intermittently and I am trying to determine the
cause.  When it misfires, it does so constantly at all 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

_______________________________________________
S-CAR-List mailing list
http://audifans.com/mailman/listinfo/s-car-list
http://www.audifans.com/kb/List_information