[s-cars] Running Rich: Help with Fault Code

[calvinlc at earthlink.net]

Brian,

If the Audi controller is like most controllers I know of the computer will
only correct to a certain point and then it assumes the O2 sensor is bad and
goes to open loop.  Of course these could be totally different and I could
be talking out of my butt.  The voltage reading 0.4 to 0.5 volts, is this
based on a DVM measurement or an O-scope measurement.  If it's a DVM
depending on the "processing" inside the DVM that may be fine.  If there is
actually a flat line on an O-scope at 0.4 to 0.5 volts then that's an
indication that the O2 sensor is improperly hooked up or just not working at
all as the O2 sensor should not be capable of hanging out at that voltage
given that it's a narrow band O2.  Just some thoughts.

--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Brian Powell
Sent: Tuesday, March 22, 2005 6:03 PM
To: Tom Mullane
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Running Rich: Help with Fault Code


Tom,

Thanks for the data point. I have a message in to Mihnea about this
issue; however, with his move to the UK, it has been tough to reach
him. Hopefully, before long, I can get him to tune in person.

My mileage has been crappy too. I would think that the O2 control loop
would still be able to dial it back more....


On Tue, 22 Mar 2005 19:57:00 -0500, Tom Mullane <tmullane at snet.net> wrote:
> Brian,
>
> Mihnea likes fuel.  My S6 with the same set runs very rich.  I was alarmed
> at first, but I have gotten used to it.  Marc Swanson logged a bunch of
> air/fuel data trying to sort out a different car, and found the MRC chip
to
> be based toward rich.  My Stromung tips are encased in a layer of
protective
> soot.
>
> Tom
>
> Date: Tue, 22 Mar 2005 16:05:46 -0700
> From: Brian Powell <powellb at gmail.com>
> Subject: [s-cars] Running Rich: Help with Fault Code
> To: s-car-list at audifans.com
> Message-ID: <910ae26605032215053dfd903f at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Greetings, my car has been running rich of late. I had an oldish O2 sensor
> in there, so, I replaced with a universal (I didn't pull codes before
this).
> After 10 days, it is still acting the same way, so I plugged in VAG-COM
and
> got the following fault code:
>
> 00537  - Lambda (Oxygen Sensor) Regulation
>          11-10 - Control Limit Not Reached - Intermittent
>
> So, a new (spliced) O2 sensor and this is there. Granted, it could be left
> over from the previous O2 sensor; however, things are still rich.
> The tailpipe is blackened and the plugs are sooty.
>
> Any ideas?
>
> BTW, I have an RS2 setup with 37# injectors and MRC software. I am also at
> altitude (Denver).
>
> --
> Cheers,
> Brian
>
>


--
Cheers,
Brian
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