trip computer weirdness

Tom Donohue donohue at
Wed Apr 26 21:41:45 EDT 2006

----- Original Message ----- 
From: <jos1 at>
To: <quattro at>
Sent: Wednesday, April 26, 2006 3:13 PM
Subject: trip computer weirdness

> Has anyone else had their trip computer suddenly become flaky? On my
> 1990 200q, the trip computer just started quadrupling my MPG -- went
> from showing the usual 22-27 MPG under normal driving conditions, to
> 102-180 MPG; tank to empty likewise now reads 2000 mi. at fillup, and
> fuel used barely registers. Other functions such as boost, time elapsed
> and MPH are normal.
> Any BTDT on what's happening and how I can fix this? The computer used
> to be about 12% optimistic before, but this is ridiculous!
> Thanks in advance for any insights!
> JS

Have to chime one of my 91 200 20v TQAs (my daily driver) the trip 
computer is doing strange things in concert with the speedometer.  When 
cruising at 3k rpm or so on the interstate, the speedo will drop to 45-65 
mph range and bounce up and down.  Simultaneously, the mpg indicator will 
start dropping precipitously from the 23+ actual reading and will go down 
into the low teens.  When the speedo stops doing its strange thing, the mpg 
starts climbing again steadily.  This has been going on for about the last 3 
weeks and seems to be totally random.  It is happening around town now, 
also.  Any BTDT?  Thanks Tom 

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