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

[Jeff Postupack]

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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