Thread: MPGuino in CRX
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Old 02-19-2013, 06:37 AM   #27 (permalink)
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meelis11's Avatar
Join Date: Feb 2009
Location: Estonia
Posts: 199

Green frog - '97 Audi A4 Avant 1.9TDI 81kW
90 day: 43.1 mpg (US)
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Any updates?
Instant mileage is calculated by two values - speed and consumption. If one is bad, then instant mileage is rubbish.

I suggest you check instant speed reading and fuel consumption per hour reading.
They are "almost" raw readings from injector and speed sensors (of course multiplied by pulses/mile and microsec/gallon readings)

* liters/hour or gallons/hour reading in idle should be realistic (what is realistic, depends on your car: 0.5L/h ... 1.5L/h) and not jump around much.
* instant speed should not jump around much, if it does, then there is a problem
* if instant speed is correct and injector signal is missing/bad connection, then mileage jumps to high levels - mpguino thinks you are moving but fuel is not consumed.

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