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I'll clear this up as best I can...
DFCO is a fuel saving technique. It completely shuts down fuel delivery when active. There's no solenoid or anything, the PCM just doesn't command a pulsewidth to the injectors. As a result, you save gas while decelerating, and you also get much more effective engine braking (the dragging feeling you get). This is from the extreme vacuum the engine pulls. Every cylinder shuts down on fuel delivery. The popping you hear are lean pops from fuel boiling off of the back of the intake valves. The spark plugs are still firing, although the timing is retarded back. This doesn't hurt anything.
DFCO does not kick in the instant you let off the gas. There is a slight delay. Certain criteria have to be met to enter DFCO... vehicle speed, engine load, engine speed, etc. DFCO will not be active while the clutch is pushed in, and generally will not be active below a certain rpm. There is a re-enable rpm that will cause fuel to be injected again when the engine speed drops under this speed.
Yes, you can disable DFCO to get rid of the popping completely. Personally, I like heavy engine braking for the minor boost in fuel economy, but also the feel... It is a free way to take some load off of the brakes. You can't really just go in the tune and say "Ok, just run this AFR at this point!" and do what you're suggesting (directed at 14pilot). Personally, I'd never dump fuel like that... EVER. That's a great way to completely foul your spark plugs and wear out your rings (gas is abrasive).
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