5.0L non HO to HO

[PKRWUD]

Originally posted by tom988
OK I have two wires going to each injector. So they must be sequentially fired right? How could injectors be batch fired? some of them would be firing on the exhaust stroke. What does the fuel just sit in the manifold til the intake valve opens and it gets sucked in?

Batch fired and sequentially fired injectors both have two wires going to each injector. Check the color of the wires. If each one has a common color wire, and a different color wire from all the rest, then it is already sequentially fired. If it has a common wire color for all 8, and then another common color for one bank, and a third common color for the other bank, it's batch fired. See the images I attached before.

Batch fired, known by Ford as Multiport Fuel Injection (MFI), sends fuel through the injectors in groups of four at a time. Right bank and left bank. The intake valve only opens once during each of four strokes, and that is when the accumulated fuel enters that cylinder. To keep the engine from running extremely rich, one of two measures is taken; either 14 pound injectors are used, or the pulsewidth is greatly reduced by the ECM. It depends on the application. This is why the ECM, the wiring harness, and the injectors should all be replaced.

Originally posted by QuantumMotorsports
Nope, wasn't too rich, ran great, no problems with the motor at all.

Then you should write a book. You've figured out how to do something that scientists and engineers the world over couldn't.