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

[John Cunningham]

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>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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