[s-cars] 1993 S4 - need some help

[Mark Strangways]

One thing that can provide for rich running conditions is a stuck open 
thermostat.
It never really lets the engine get to that temperature that it wants to 
see.
I found that it does affect mileage drastically, and will cause that rich 
condition.

The other item that come to mind is the FPR, they can fail or the rubber 
hose that goes to the top of it can (and does) become very dry.  Mine is 
loose, and should be replaced.
If yours is very loose or off then the vacuum at cruising will not be there.

What sensors did he (the mechanic) clean ?

Mark


----- Original Message ----- 
From: "Evan Levine" <evan.levine at gmail.com>
To: "S-CAR at audifans.com" <s-car-list at audifans.com>
Sent: Tuesday, December 07, 2004 9:04 AM
Subject: [s-cars] 1993 S4 - need some help


> Long time reader.... not often poster, usually stick to AW. But I'm
> having a long standing problem that no one seems to be able to help me
> with... so I'm turning this one to the experts.
>
> 1993 UrS4 - Pastore chip, samco hoses, constant torque clamps - yada
> yada other mods that don't really work into this equation. There is no
> boost leak.
>
> Car keeps running rich, I can see it on my A/F gauge and in my fuel
> milage, also the black nasties that come out the pipe when I get on
> it.
>
> This was diagnosed for months by me to no solution, and finally my
> mechanic tried cleaning some sensors, and magically it went away...
> for about 2 weeks. Now it's back. Do I need to clean these sensors
> better? Was it just luck and the weather or something is why I thought
> it was fixed for 2 weeks? If the sensor needs constant "cleaning" is
> that an indicator that it is bad and should just be replaced?
>
> Any input on why it's running rich would be greatly appreciated.
>
> Evan
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