[s-cars] New faltering problem

[Tom Green]

I believe the heated O2 sensor performance is monitored by the
ECU, Bob, and deposits fault codes in memory, illuminating the
MIL if such fault is detected during engine operation.

Instead of sitting in the drivers seat holding the steering wheel and
trying to look around the curve for Rod Haney wannabees and coal
miners on payday, try checking for a MIL when this stumbling occurs
and maybe even check for any stored fault codes.  This may help
the list discern the problem in a more orderly fashion than the WAGs
that can presently be offered.  :-)

My WAG:  check the ground for the coil pack on the rear of the valve
cover.

My advice:  make sure your window is open on those early mornings
and you will probably hear the ones you want to avoid.  :-)

Tom

> Date: Thu, 19 Jul 2007 09:14:17 -0700 (PDT)
> From: chris chambers <fastscirocco_2000 at yahoo.com>
> Subject: Re: [s-cars] New faltering problem
> To: Robert Myers <Bob at chips-ur-s.com>,	Michael Wakefield
> 	<S4Quattro at comcast.net>
> Cc: s-car-list at audifans.com
> Message-ID: <456353.11271.qm at web60525.mail.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Rob,
>
> If warming the ca rup helped that could add to the theory of a bad  
> OXS.
>
> The OXS in our cars is a heated sensor, if the "heater" died then it
> won't be able to read correctly until the exhaust system warms up
> enough to warm up the OXS, which could cause it to run rich/lean
> causing the stumble.
>
> Let us know how it works out!
> Chris
>
>
>
> --- Robert Myers <Bob at chips-ur-s.com> wrote:
>
>>
>> The OXS is relatively new but I'll give it a try.  This makes as much
>> sense
>> as what I came up with.
>>
>> BTW, letting the car idle for a minute or so before heading out did
>> make a
>> difference this morning on my way out to pick up a new $44.51 OXS.