[urq] weird o2 sensor readings? (mc'd urq)

[Martin Pajak]

Michael,

Sounds like you need a new or rebuilt fuel distributor.
BTDT on two MCs and two WXs...
After making sure everything works and still getting lean condition under
load we changed the FI unit and all was well afterwards.

HTH
Martin Pajak

http://www.quattro.ca

1983 Audi Ur-quattro (289,000 km) Canadian spec. winter car
1985 Audi Ur-quattro (166,000 km) Euro spec. import ;o)



> -----Original Message-----
> From: urq-admin at audifans.com [mailto:urq-admin at audifans.com]On Behalf Of
> Michael S. Williams
> Sent: July 6, 2003 20:53
> To: quattro at audifans.com; urq at audifans.com
> Subject: [urq] weird o2 sensor readings? (mc'd urq)
>
>
> hey all... so, i made a little jumper thing that allowed me to
> connect my multimeter up to the signal wire for the o2 sensor...
> basically, i just used a long bit of wire and combined it with a
> short bit of wire into a spade terminal on one side... then, the
> other end of the short wire continues the line from the o2 sensor,
> and the long one goes into the cabin and is the one that i hook the
> multimeter up to...  i connected it at the factory spade terminal,
> cause it seemed easiest and the least intrusiveto the system...
>
> so, apparently the sunpro multimeteri have fits perfectly behind the
> shiftboot andwill stay in place while driving.  i used an alligator
> clip to hold its ground (i used one of the grounds on the chassis
> under the driver's kick panel... that circular thing w/ lots of
> ground terminals), and then had the other lead connected to the wire
> i ran in from the engine bay....
>
> so, here's where the weirdness started... the display was showing
> about .400-.600v at idle, and would drop quickly under load, to
> almost zero....  so, i pulled over and turned the mixture screw about
> 1/2 turn clockwise (i know that's alot)... enough to cause the
> frequency valve to shut off at idle... got back in the car, and at
> idle, itwas reading about .800-.900v... ok... SEEMS closer... but
> assoon as i got on the gas, it would drop...
>
> but here's the strange thing.  the car had a LOT more power, and the
> reading dropped BELOW 0v, into 'negative' voltage, about -.02 or
> so....  and finally, when i turned off the car, the voltage reading
> stayed there, and was around .550v
>
> but, like i said, the power is closer to where it is supposed to be,
> it isnt using coolant, the compression is almost exactly the same
> across all 5 cylinders, the o2 sensor is brand new, the idle/wot
> switch is new, the temp sender for the isv is new, the michelin man
> hose is new, i checked and rechecked the intake hosing, inspected the
> vacuum lines.....nothing....
>
> the one thing i dont have on hand is a fuel pressure gauge, but im
> gonna order one, since it seems like it's a good idea to have anyway,
> esp w/ the cis....
>
> anyone have any thoughts?
> --
> MswmSwmsW
>
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