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Old 08-07-2014, 09:32 PM   #4 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
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Just a hunch, but it sounds like the same issue I had with my Firefly/Metro.

The gauge doesn't like being interrupted by the ign kill switch - it has to do with the communication protocol of your OBD-II.

To confirm: purposely stall the car (eg. dump the clutch in 5th gear at a crawl) at the top of a hill or something, where you can then release and keep rolling (with the engine off). My bet is the gauge stays active and keeps showing speed & mpg, etc.

If that happens, you just need to figure out a different way to wire your kill switch (spark or fuel, but not key circuit).
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