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

[John Cunningham]

Woo hoo! What do I win? 1000 innerwebz points? I'm on a roll.  

Sent from a flat touchy device of some sort

-------------------------
John J. Cunningham
US Mobile +1 (617) 750-5025
China Mobile: +86 136 8175 8180

> On Jan 20, 2014, at 12:30, Jeff Postupack <jeff.postupack at gmail.com> wrote:
> 
> 6:30AM report from 'Southern Boy"  (thanks Fred) - I beat the cold front!
> 
> thanks for the assist boyz
> 
> My primary problem turned out to be the MAF.
> 
> Thanks to DaveF QW writeup on the MAF female connector pins pushing back
> and JohnC mentioning MAF in an email to me.. they drew my attention to the
> MAF.  Whereas I did not have that connector issue, I used a heat gun on the
> MAF to effect the running engine behavior. Bopped it with a screw driver
> and wow, look at that effect.   And thanks to a handy Red S4 Parts car, I
> swapped the entire MAF/Air box and BOOM!
> 
> Fixed. Just like that.
> 
> In the course of all this, I found a sketchy 034 Coil pack too, so replaced
> that.
> 
> Now with all my new parts, (fuel filter, fuel pump, fuel regulator etc.,
> plugs, etc) .  I should be good to go, until the NEXT time it twists my
> nipples..
> 
> It was cool to correspond with ya' all,
> 
> If anyone has a MAF  for sale, I want one in the parts bin  LMK
> 
> Posto at comcast.net works
> 
> Jeff Posto
> 
> 
>> On Sun, Jan 19, 2014 at 12:52 PM, Cody Forbes <cody at 5000tq.com> wrote:
>> 
>> I was going to say it sounds more like a vacuum leak. That fuel pressure
>> though is way too high, so could be an FPR failure.
>> 
>> -Cody Forbes (mobile)
>> 
>> On Jan 19, 2014, at 12:27 PM, "Jerry Scott" <jerryscott at wispertel.net>
>> wrote:
>> 
>>> Jeff
>>> Your problem sounds more like a coil failure than a fuel pump.
>>> Jerry
>>> 
>>> -----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 8:08 AM
>>> To: S-Cars; Jeff Postupack
>>> Subject: Re: [s-cars] 1995.5 S6 now running rough after warm up
>>> 
>>> 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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