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DFCO is easy to determine, by two methods.
Use a mechanics stethoscope to "listen" to the injectors ticking. Rev the engine and let off the throttle. If you have DFCO the injectors will quit "ticking" until the engine speed drops down close to idle.
Second method, accelerate in 3rd gear to a decent speed, then let off the gas, let the engine slow the car down until you feel the engine start to actually come back to life and start to add some power to the car. It won't be much but is noticeable.
In most cases DFCO has been around for a long time. I know it was in 1981 Nissan Z cars, and possible in the earlier ones dating back to the first fuel injected Z cars in 1975.
With fuel injection DFCO eliminates the need for air injection that was used in carburetors to burn the excess fuel during deceleration.
If you dont have a mechanics stethoscope you can improvise by using a phillips head screwdriver. Place the tip on the injector body and the handle on you ear.
regards
Mech
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