'90 200 mileage computer

[cody at 5000tq.com]

It's driven off of a potentiometer in the air filter box that reads  
the position if the fuel metering plate. I'm guessing you have a dirty  
pot that sends bad readings at certain spots.

-Cody Forbes
http://www.5000tq.com



Quoting Nick Lawrence <nick at beol.net>:

> My questions: (1)what are the inputs to the avg mpg and miles to   
> empty on the trip computer?
>                       (2)  are the calculations done in the   
> instrument cluster or elsewhere?
>
> My avg mpg and  miles to empty were way off,  not dip switch off,   
> but 3 digit mpg and 1600 miles to empty!
> It apperared to be working correctly 5-6 years ago when I brought   
> the car home but then went whacky and has not been near the top of   
> the fix-it list.  Once this week the read out went wildy flucuating   
> but with very low numbers.  Now it appears to about right.  20   
> something mpg and 100 miles to empty on near quarter tank.
> One of my other Audi's is way off also on the miles to empty.
> So if/when it fails again where might I begin looking for a poor   
> connection or failed component?  TIA
> Nick
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