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Old 12-15-2010, 07:23 AM
leon leon is offline
Dodge Ram Forum Newcomer
Join Date: Nov 2010
Location: Ft. Worth, Texas
Age: 61
Posts: 13
Gender: Male
Vehicle: 2004 Dodge Ram
Color: Arrival Blue
Engine: 2001-2003 359ci (5.9L) Cummins ISB 24-Valve Diesel I6 235hp 460lb/ft (manual and auto)
Rep Power: 0
leon is on a distinguished road

My speedo is right as compared to a GPS. I don't expect the onboard computer to be exact, but like RamTech says, a ball park figure. But its 20% off. That's what got me to thinking something might be wrong. Assuming the onboard computer is using the amount of time the injectors are open to calculate fuel usage, and since I'm using the amount of fuel I put in the tank, the difference indicates missing fuel. There's about 18 gallons of fuel unaccounted for. I don't see a leak that big. That's a little over an ounce per mile.

Does anyone know where there is technical documentation on the on board computer?
The service manual isn't very informative.

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