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I know for a fact is was in the 1981 Datsun Z cars. Might have gone back to 76 but not absolutely sure. DFCO allowed the elimination of air injection into the exhaust system. They may have tried it on some of the last carburetors. Electronically shutting off the idle circuit, but that is speculation.
Easy test is to place a stethoscope on an injector and rev the engine, let the throttle go completely back to idle and the injectors will stop ticking completely until the RPM drops to just above idle speed. That may not work in some of the more modern versions but it worked in a 1981 Z car long before OBD 1 or 2.
regards
Mech
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