[s-cars] 1993 S4 - need some help

[Evan Levine]

I already changed the O2 sensor... and we checked the FPR very
carefully. I have not tried a known good MAF - that is a good idea.

The cleaned sensors were pretty much anything under the hood we could
find readily. The one he thought made the difference was the head temp
sensor.


On Tue, 7 Dec 2004 09:18:52 -0500, Mark Strangways
<strangconst at rogers.com> wrote:
> 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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> >
> 
>