90q 20v Running Rich

[Bernard Littau]

Hi David,

I'm not at all familiar with the 90 20V, so I cannot guide you further with
specifics.

On the 4kq 10V, the engine temp sensor used by the ECU is separate from the
Multifunction sensor.

If your thermostat is wide open you may be running the engine too cold --
this might be the case if you gauge is showing colder than normal.

If your car is chronically running rich, my list would now be:

1) Thermostat
2) Temperature Sensors
3) O2 Sensor
4-24) Other arcane stuff such as altitude compensation and fuel pressure
related items
25) Mixture adjustment

Best,

Bernard Littau
Woodinville, WA

> -----Original Message-----
> From: David Thoresen [mailto:david at epicfoto.com]
> Sent: Monday, June 16, 2003 1:35 PM
> To: Bernard Littau; quattro at audifans.com
> Subject: Re: 90q 20v Running Rich
>
> I have noticed that the multifunction sensor has been pretty cold.... I
> just
> put it in a few months and it never goes over 1/3 way up... Always thought
> that was weird.. Or perhaps I should check a different sensor?
>
> Ciao!
> SP
>
> >
> > First, make sure everything else is OK.
> >
> > I would start with the temperature sensors and make sure they are all
> > functioning correctly.
> >
> > On the 10V 4kq, I would suspect a faulty engine temperature sensor, one
> that
> > is reading cold.  The temperature sensor tells the ECU to run rich
> (Think
> > Choke) while the engine is cold.
> >
> > I'm pretty sure the 20V will have a similar system.
> >
> > Best,
> >
> > Bernard Littau
> > Woodinville, WA
> > '86 4kq