How do I know if my car uses DFCO?

[bestclimb]

It has DFCO, they have sense the 80s. You can feel the injectors cut back in when you slow down.

When you get an Ultra gauge you have to tell it if you have DFCO. If you have told it you have dfco it calculates fuel burn based on it when the throttle is closed and the engine goes into open loop. The ultra gauge does not know anything about the status of the injectors. It knows fuel consumption based on air flow. To tell if you have dfco by the gauge you need to have the O2 sensor gauge displayed, it will go full lean on dfco and the loop indicator will go open.

[96CX]

Originally Posted by RobertISaar

the transmission is incapable of shifting into neutral without the shifter physically being moved.

what is happening is the torque converter is unlocking and allowing the driven portion(transmission side of converter) to overrun the driving portion(engine side of converter).

Or that. I'm pretty hazy on what exactly happens in my automatic transmission. It just feels like neutral (though not neutral proper as if I had moved the shift selector), based on how the tranny responds when I press on the gas again. Thanks for explaining!

[RobertISaar]

Originally Posted by 96CX

Or that. I'm pretty hazy on what exactly happens in my automatic transmission. It just feels like neutral (though not neutral proper as if I had moved the shift selector), based on how the tranny responds when I press on the gas again. Thanks for explaining!

most conventional automatics act as such, but i'm sure there are exceptions, especially with extremely recent autos, especially the dual-clutch type, since those are basically computer controlled manuals. for OP, the 05 2500 is likely a 4L80 transmission, which is a computerized and 4th gear added TH-400, which came about in..... the mid 60s, IIRC. solid performer, though it has more parasitic losses than the lighter-duty 4L60/4L65 that would have been used on the 1500 trucks of the same year.