[s-cars] Diagnosing misfire cause

[Douglas Landaeta]

I would be very, very surprised if it was the ECU, unless you've had a water drain problem that has subjected it to a water bath.

I vote for coil wires shorting. Inspect carefully. If you're anywhere close to a fellow lister, a quick swap of the coil pack head followed by the POSs will likely isolate the problem.

Doug Landaeta
Nashville

> On Jan 20, 2016, at 6:03 PM, Cody <cody at 5000tq.com> wrote:
> 
> PS. Several places can also repair them. I highly recommend Programma Inc in Florida, they have done probably 30 of them for me.
> 
> 
> 
> 
> 
> 
> Cody Forbes
> Black Forest Racing
> (704) 489-0741
> www.BlackForestRacing.com
> Facebook | Instagram | YouTube
> 
> -----Original Message----- From: Tom Rodriguez
> Sent: Wednesday, January 20, 2016 6:39 PM
> To: s-car-list at audifans.com
> Subject: Re: [s-cars] Diagnosing misfire cause
> 
> 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
> 
> 
> 
> 
> 
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