[s-cars] 1995.5 S6 now running rough after warm up

Sun Jan 19 14:40:30 PST 2014

Hi Jeff;

I'm with Jerry on this one. If you initially had it isolated to a "bad plug"
and it improved when the plug was replaced and then re-occurred, I suspect a
bad POS or bad coil on the cylinder that had the "bad plug". The POS is the
easiest to change if you have a spare - if you don't, swap the other POS
over and see if the misfire moves cylinders with the POS. If the misfire
persists with a replacement POS, I'd try replacing the coil. When you say it
was running really rough, are you losing more than one cylinder? The car is
actually fairly drivable on 4 cyls - I drove my UrS4 a fair distance with
the injector connector pulled when I lost a coil on it.

I feel your pain on the Arctic cold - actually, I expect to feel more pain
than you will, southern boy :) The temp is already dropping here - just got
in from communing with the snowblower.
Good luck!

Fred Munro
'97 S6

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Jeff Postupack
Sent: Sunday, January 19, 2014 5:13 PM
To: John Cunningham
Cc: S-Cars
Subject: Re: [s-cars] 1995.5 S6 now running rough after warm up

Thanks Ian, Jerry and JC !

I swapped the fuel pump it improved.. but after a short drive (up my street)
it stumbled once again  and Check Engine lit up.

I went back to the barn, VAG-COM said Code 00537..

the same damn code I started with at 8AM today..after all the effort and
coaching you guys and QW gave. me.

so I shut it off, gave it a kiss and thaked the Audi Gods for a good ride.

With the Artic cold hitting Monday PM, I'm not gonna work on it for a while.

I'll rent a GD car!

Maybe it is electrical.

JP

On Sun, Jan 19, 2014 at 1:14 PM, John Cunningham <jc at j2c3.com> wrote:

>  Jeff-O!
>
> Bummer dude - though you got yer money's worth outa that beater in the 
> 6th or 7th week of re-ownership I suspect, but nonetheless - I too 
> vote for other coil-sparking components - but do you have a reason to 
> be sure that's not a prob?  I'm tryin to mementomember whats under that
ol' black hood.
> Amazin' Kreskin sees 1.8/2.0 coils maybe?
>
> Maybe I should drive up in the newly manualized 540iT next week and 
> show ya how real UrS fixin' is done, while simultaneously doing horrific
damage
> to your beer supply.  ;^)   Only half-jokin.  I'm overdue to blaze through
> VT and visit some of my ex-hippie friends, maybe sunthin can come
> together.   I can bring parts.  Sure they'll be BMW parts, but they'll be
> parts...  No guarantees, lots of balls in the air ( <-- leavin that 
> one open for PK) but maybe sunthin works out...
>
> Off to annihilate a tiny bit more of Belgiums beer supply -
>
> JC
>
>
>
>
> On 1/19/2014 16:07, Jeff Postupack wrote:
>
> I installed a fuel pressure gauge during debug and I see about 60 PSI 
> idling, and when I open the throttle, it momentarily drops to ~ 55psi, 
> then builds to 70 psi..
> this seems pretty abnormal. Don't ever remember seeing this variation 
> on the Pearl S4
>
> Frankly I'm just looking for the push and confirmation to JFDI.
>
> fuel pump that is.. Just Freakin Do It.
>
>
> On Sun, Jan 19, 2014 at 9:44 AM, Jeff Postupack <jeff.postupack at gmail.com>
<jeff.postupack at gmail.com>wrote:
>
>
>  Gents.
>
> My old trusty winter  Blk/Blk S6 is now suffering in the barn.  157K 
> miles Stage 1, stock all else
>
> I do try to keep up on preventative maintenance, but I may have 
> procrastinated too long on one particular item.
>
> After a near flawless 720 run NH to PA- NH last weekend, it developed 
> a misfire under boost around Jan 14th  It got worse and worse, until 
> it was easy to debug on Thursday.
>
> I isolated that pb to a single Bosch spark plug, however I changed 
> them all to new NGK BK7RE. being suspicious (The Bosch I removed were 
> the tri-electrode, forgot the P/N)
>
> After plug swap it ran strong up until Sat morning.. when it started 
> running so rough that I would not drive it up my hilly driveway, back 
> in the barh she goes.
> (Sat am cold start, after warm-up rough idle and very low power,
> stumblinjg)
>
> Code is
>  00537 VAG1551/2 Fault Code Number- See below C/O QW
>
> After checking my records, I changed the easy stuff this morn.
> new fuel filter
> new Fuel regulator
> New Oxygen sensor.
>
> After each component change I cleared codes and ran again.
> 00537 re-activates.
>
>
> This brings me to the last one you guys may say is obvious, Fuel Pump.
> I don't have records on this being changed..Hard to believe but..
>
>
> QshipQ? , Dave Dawson? All takers?
>
> Go ahead, beat me up for not changing the FP, but HELL! It's January in
NH!
>
>
> Jeff Posto
>
> Oxygen Sensor Control Limit exceeded,
> fuel pressure too low or too high,
>  intake or exhaust leak,
>  defective ignition system component,
>  intake air leak after air mass sensor,
> O2 sensor is faulty
>
> Symptom: CO before catalyst is below 0.3% or greater than 1.0%, 
> Extremely lean or overly rich exhaust, Spark Plug foulin
>
>
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> ----------------------------------
> *John J. Cunningham*
>
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