This is not a big deal, except when shopping for camshafts. units retained the old order, and the current 5.0 Explorers continue to use the old 302 firing pattern.
The firing order was changed in 1983 on the H.O. Also in 1986, Roller Tappets, low tension piston rings, and improved heads were made standard on the S.O. MAF sensors detect the actual amount of air entering the engine, instead of calculating the approximate amount based on the velocity of the air. Note that it is not a Mass Air Flow (MAF) system.
It sends a command to each injector - in sequence- to deliver the precise amount of fuel necessary. The system would accept inputs from Oxygen sensors in the exhaust manifolds, throttle position, air speed, temperature, and density and determines how much fuel to meter out to each cylinder. It utilized a two piece cast aluminum manifold with tuned runners and Speed-Density air metering. It utilizes one injector per cylinder, located above the intake valve. "Sequential Electronic Fuel Injection was made standard in 1986. Heads, cam, exaust, intake,throttle body, computer, firing order.
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