[s-cars] Intermittent stall

Tue Aug 4 18:19:27 PDT 2015

One more thing to check. Sometimes the ignition wires fray as they pass into the coil tree. They can randomly short out based on engine vibration (which caused it in the first place).
FWIW
Mike Wakefield
93 Urs4
GT-30
> On {August4}, at 6:38 PM, Duncan Thomson <thomson.duncan at gmail.com> wrote:
> 
> Thanks for the ongoing feedback folks.
> Ignition switch was done recently, so not that. Have previously done the
> POS spare channel swap, so I know what that feels like, and this is
> different. I have had an occasional misfire under load too, so starting to
> suspect ignition system may need a refresh. Wiring may be my first port of
> call.
> 
> And thanks for the info Wylie. I want to stay in denial of ECU issues too,
> at least until I can tick off a few of the easier / cheaper options!
> 
> On Wed, Aug 5, 2015 at 3:56 AM, theringmeister at triad.rr.com <
> theringmeister at triad.rr.com> wrote:
> 
>> Unfortunately Jerry, it's not those chips. Apparently the ignition driver
>> chip is a proprietary design and there's not a suitable replacement.
>> It's not the ones that get replaced when 'chipping' the car.
>> 
>> Sent on the new Sprint Network
>> 
>> ----- Reply message -----
>> From: "Jerry Scott" <jerryscott at wispertel.net>
>> To: <theringmeister at triad.rr.com>, "'Tony Curran'" <
>> tony.curran at sympatico.ca>, "'Duncan Thomson'" <thomson.duncan at gmail.com>,
>> "'s-car list'" <s-car-list at audifans.com>
>> Cc: "'s-car list'" <s-car-list at audifans.com>
>> Subject: [s-cars] Intermittent stall
>> Date: Tue, Aug 4, 2015 11:24 AM
>> 
>> I still may have the chips that came out of my 93 when the Hoppen upgrade was done, and would only have a few thousand miles on them.  Would that help anyone?  I no longer have the car, so I don't need them.
>> Jerry
>> 
>> -----Original Message-----
>> From: S-CAR-List [mailto:s-car-list-bounces at audifans.com] On Behalf Of theringmeister at triad.rr.com
>> Sent: Monday, August 03, 2015 7:10 PM
>> To: Tony Curran; 'Duncan Thomson'; 's-car list'
>> Subject: Re: [s-cars] Intermittent stall
>> 
>> Exactly my point, Tony. I did most of those things chasing my issue and spent a lot of needless money on things that weren't the culprit.... mainly because I didn't want to believe my ECU was the culprit.
>> 
>> Sent on the new Sprint Network
>> 
>> ----- Reply message -----
>> From: "Tony Curran" <tony.curran at sympatico.ca>
>> To: <theringmeister at triad.rr.com>, "'Duncan Thomson'" <thomson.duncan at gmail.com>, "'s-car list'" <s-car-list at audifans.com>
>> Subject: [s-cars] Intermittent stall
>> Date: Mon, Aug 3, 2015 8:07 PM
>> 
>> There's a whole long list of things to investigate...
>> 
>> POs,
>> Coils,
>> Ignition wiring,
>> Ungapped spark plugs,
>> Fuel pump,
>> Fuel pump relay,
>> O2 sensor,
>> Vacuum leak,
>> MAF - clean,
>> 
>> Good luck
>> 
>> Tony
>> 96 S6
>> 
>> 
>> -----Original Message-----
>> From: S-CAR-List [mailto:s-car-list-bounces at audifans.com] On Behalf Of theringmeister at triad.rr.com
>> Sent: August-03-15 7:16 PM
>> To: Duncan Thomson; s-car list
>> Subject: Re: [s-cars] Intermittent stall
>> 
>> Depending on your affinity for internet forums, you may want to pose the question over on the QW (UrS car specific) forums. That said, I never had a complete stall at idle (that I recall) but I had a nasty 'hiccup' where my car would cut off for a split second and then be back running the next while driving. A lister was kind enough to loan me an ECU to swap in and sure enough that cured the issue. What I recall is that the ignition driver chips are failing and the cause. Steve Eiche has the lowdown but unfortunately there isn't a replacement chip out there.  If I were you I'd see if you can do the same with a known-good ECU. I did a whole lot of part swapping/replacing, only to find the ECU was the cause.
>> 
>> Hope that helps
>> 
>> Wylie Bean
>> Greensboro NC
>> 
>> 
>> 
>> Sent on the new Sprint Network
>> 
>> ----- Reply message -----
>> From: "Duncan Thomson" <thomson.duncan at gmail.com>
>> To: "s-car list" <s-car-list at audifans.com>
>> Subject: [s-cars] Intermittent stall
>> Date: Sun, Aug 2, 2015 8:51 PM
>> 
>> Hey folks,
>> 
>> I know I should probably do a lot more searching before I ask, but email volumes seem low!
>> I am getting an intermittent stall at idle. It is a clean cutout, and the engine just goes straight from running smoothly to stalled, instantly.
>> 
>> It seems to do the same thing when running, but with some extra revs on it catches again and keeps running.
>> 
>> Any ideas where I should look first?
>> 
>> Is it possible I'm losing spark on 3/5 cyls from a dodgy POS?
>> More likely to be Crank position or something else?
>> 
>> Any advice gratefully received!
>> 
>> Cheers
>> Duncan
>> '93 UrS4 Avant
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