Tango Charlie -
(I have an old-school-ugly SGI)
I don't think you have a leaky injector. Even 9999 MPG is technically wrong. My theory is that there is some kind of divide by zero failsafe leading to the 9999 MPG, which should otherwise be infinite.
When I EOC, my MPG is 10 times my MPH. Soooooo, If I am coasting at 45 MPH, the SG reads 450 MPG.
The 0.04 GPH and sub-1K MPG sounds similar to mine. The next time I do an EOC, I will check on my GPH and tell you what it is.
On a similar note, when I EOC, the engine RPM should be reporting 0. However, on my 1999 Saturn SW2, it reports 61 RPM. This leads me to believe that either :
1 - There is "noise" in the RPM sensor.
2 - The ECU/PCM is reporting 61 RPM even though it is "seeing" 0 RPM from the sensor.
CarloSW2
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