[V8] New O2 Sensor- Whhhhaaaatt

[dsaad at icehouse.net]

I will probably confuse everyone here - but I seem to recall that the sensor at
the back of the right head is described in the service manual as both a "switch"
meaning it is a on/off type device only, and as a "sensor" meaning that it has a
variable resistance according to temperature. I believe the correct part is the
variable resistance type - and it has a white plastic connector.

The on/off type sensor has a black plastic connector.

They are physically interchangable.

The moral is to be careful at the parts department - maybe even bringing in your
old part to match.

Dave



Quoting Ingo Rautenberg <i.rautenberg at waratap.com>:

> Funny...I'm going through this same thing right now (but with Bosch 3-wire)
> on the '93.  I'm guessing that the coolant temp sensor at the back of the
> pass. side (USA) head is not functioning properly.  Will replace and see
> what happens.  Figure a 20-30% improvement in fuel mileage will help with
> the possible $4/ gallon fuel they're anticipating...
>
> Ingo
> '84 urq - '91 V8 5 spd - '93 V8 - '90 V8 (project) - '93 90s
>
> ----- Original Message -----
> From: "rudedog714" <rudedog714 at alaska.net>
> To: <V8 at audifans.com>
> Sent: Saturday, July 15, 2006 2:15 AM
> Subject: [V8] New O2 Sensor- Whhhhaaaatt
>
>
> > Here's a head scratcher, at least for me. I just replaced my O2 sensor,
> went with the 4 lead type. Now the thing is fine until it warms up the it
> seems to run too rich. Flat stretch of road at a steady 65 MPH should give
> me 25-28 MPG instead it's 15-17 MPG then it'll go back to normal for a bit
> and back to running too rich. I've double checked all the connections and
> the extra ground lead is on a bolt behind the drivers side head. What's
> going on here, I'm baffled. Thanks in advance for all the incredible Audi
> expertise, William
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