Hello,

I just got my scangauge recently. While monitoring the fuel flow gauge, I noticed that the RX8 flows ~0.5GPH even while the engine is coasting down in a gear. I am amost certain that there should be 0 fuel injector pulsewidth during coasting, is there a reason the scan gauge reports fuel flow? Is this the nature of a rotary?

Thanks

 

This would be the nature of any fuel burning engine......No fuel , engine stops. You will have fuel flow at idle or at any time an engine is running

 

while engine braking the engine doesn't need fuel to keep turning.

 

most cars with an instantaneous fuel consumption value will read zero or no fuel while coasting down.
would the engine stop as it is being turned over by the wheels?
things change at low rpm when a stalling condition may exist but for coasting it seems like no fuel is required.

 

Any reason why the scan gauge does not read 0?

 

Calibration issue?

 

becasue the injectors are still injecting

 

Could it be a function of the oil injection keeping the rotors lubed?

 

in gear it should or coasting is should read mpg. confused..

beers

 

So are you saying our cars do not have Decel Fuel Cut Off?

 

Are you saying your car doesn't have Decel Fuel Cut? I'm pretty sure mine is supposed to have DFCO.... along with everyone elses except yours.

 

The way the system is supposed to work during deceleration is fuel cut to both rotors when throttle valve is fully closed and fuel cut to one rotor when throttle valve is not fully closed.(Mazda Service Highlights,9999-95-102F-04,sect01-40-31).

 

FWIW, I just got a scangauge and mine reads 0.00GPH (gallons per hour) and 9999 MPG (infinity) when decelerating. Try setting the refresh rate to "fast"?