[s-cars] Nasty Misses when Pushing the "93 S4

Thu Mar 10 18:07:55 EST 2005

See inserted answers- I've done everything but pull codes. That's the next 
step.

>
>So can a torn wastegate diaphragm.

Problem is intermittent. Car runs like a bat out of hell most of the time.

>
>At 03:14 PM 3/10/2005, chris chambers wrote:
>
>>Sounds like its cutting off the fuel pump because the ecu thinks it is
>>in an over boost situation.
>>
>>Check and see if you have any codes

Next on my list.

>>
>>Check for boost leaks

I know I'm getting full boost most of the time, it's just the occasional 
times that I get the fuel/spark cutoff.

>>Check the maf connector, a dirty connection can cause this problem. I
>>had this problem and remedied it by using a liberal amount of
>>electrical contact cleaner.

Cleaned connection several times. Replaced MAF with RS2 unit.

>>
>>A bad MAF can cause this problem
>>

See above answer.
>>
>>
>>HTH
>>Chris
>>
>>--- Bob DG <bobs6 at msn.com> wrote:
>>
>> > Cut out.
>> >
>> > >From: Robert Myers <robert at s-cars.org>
>> > >To: "Bob DG" <bobs6 at msn.com>, richard.tanimura at gmail.com,
>> > >chris.holinger at gmail.com
>> > >CC: s-car-list at audifans.com
>> > >Subject: Re: [s-cars] Nasty Misses when Pushing the "93 S4
>> > >Date: Wed, 09 Mar 2005 18:13:02 -0500
>> > >
>> > >
>> > >
>> > >Is it a miss or a cut-out.  A miss is with one cylinder.  A cut-out
>> > just
>> > >shuts everything off for a bit.
>> > >
>> > >At 06:08 PM 3/9/2005, Bob DG wrote:
>> > >
>> > >>So you think the nasty misses are a failing ignition coil? I am
>> > >>experiencing the exact same problem, intermittent fuel or spark
>> > cut-off.
>> > >>
>> > >>>From: Robert Myers <robert at s-cars.org>
>> > >>>To: "Bob DG" <bobs6 at msn.com>, richard.tanimura at gmail.com,
>> > >>>chris.holinger at gmail.com
>> > >>>CC: s-car-list at audifans.com
>> > >>>Subject: Re: [s-cars] Nasty Misses when Pushing the "93 S4
>> > >>>Date: Wed, 09 Mar 2005 14:58:55 -0500
>> > >>>
>> > >>>
>> > >>>The OEM Bosch 3 bar pressure transducer is NLA.
>> > >>>
>> > >>>A 2.5/3.0 bar VMAP (http://moreboost.com) is a suitable
>> > replacement.
>> > >>>BUT...  I don't think it will solve the problem with a failing
>> > ignition
>> > >>>coil.
>> > >>>
>> > >>>At 02:52 PM 3/9/2005, Bob DG wrote:
>> > >>>
>> > >>>>What about a replacement for the 3.0 bar sensor?
>> > >>>>
>> > >>>>>From: Richard Tanimura <richard.tanimura at gmail.com>
>> > >>>>>Reply-To: Richard Tanimura <richard.tanimura at gmail.com>
>> > >>>>>To: Chris Holinger <chris.holinger at gmail.com>
>> > >>>>>CC: s-car-list at audifans.com
>> > >>>>>Subject: Re: [s-cars] Nasty Misses when Pushing the "93 S4
>> > >>>>>Date: Wed, 9 Mar 2005 08:17:13 +0100
>> > >>>>>
>> > >>>>>Chris,
>> > >>>>>
>> > >>>>>Those symptoms sound familiar. Lots of us have BTDT. Could be a
>> > bad
>> > >>>>>MAP sensor. Could also be a leak in the boost tract. Leaks are
>> > pretty
>> > >>>>>common if you still have not changed your rubber hoses in a
>> > while.
>> > >>>>>
>> > >>>>>1. Pressure test the boost tract and listen for leaks. Check the
>> > >>>>>clamps for tightness.
>> > >>>>>
>> > >>>>>2. If it isn't a leak and you are certain it is the MAP sensor I
>> > >>>>>recommend VMAP. VMAP makes a dandy replacement to the Bosch 2,5
>> > bar
>> > >>>>>sensor.
>> > >>>>>
>> > >>>>>http://moreboost.com/
>> > >>>>>
>> > >>>>>Rich
>> > >>>>>
>> > >>>>>On Tue, 08 Mar 2005 20:47:03 -0800, Chris Holinger
>> > >>>>><chris.holinger at gmail.com> wrote:
>> > >>>>> > In Seattle, WA and was just diagnosed with a bad ECU pressure
>> >
>> > >>>>>sensor.
>> > >>>>>The
>> > >>>>> > Beast is shutting off the fuel when I really put the spurs to
>> > it so
>> > >>>>>itÂ¹s
>> > >>>>> > bucking big time.  Or, as Bob Myers put it:
>> > >>>>> > Â³symptoms:  starts fine.  Idles fine. Cruises at constant
>> > speed
>> > >>>>>fine.
>> > >>>>>Will
>> > >>>>> > accelerate if not done too enthusiastically.  If you get
>> > heavy on
>> > >>>>>the loud
>> > >>>>> > pedal you have a nasty miss.Â²
>> > >>>>> > Suggestions based upon the fact that I would like to upgrade
>> > in the
>> > >>>>>near
>> > >>>>> > future?  Keep in mind, I just want to make it back to Chicago
>> > by the
>> > >>>>>end of
>> > >>>>> > the month safely.
>> > >>>>> >
>> > >>>>> > Å’Preciate any other help/advice you can offer.
>> > >>>>> >
>> > >>>>> > Thanks,
>> > >>>>> > Chris
>> > >>>>> > --
>> > >>>>> > http://homepage.mac.com/cholinger/headinwest/
>> > >>>>> >
>> > >>>>> > _______________________________________________
>> > >>>>> > S-CAR-List mailing list
>> > >>>>> > S-CAR-List at audifans.com
>> > >>>>> > http://www.audifans.com/mailman/listinfo/s-car-list
>> > >>>>> >
>> > >>>>>_______________________________________________
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>> > >>>>
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>>
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>>struck before you crush him." ~ Franklin D. Roosevelt
>>
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