[QuantumMotorsports]

Listen man, if you're so smart, think about it, one of two things is happening when people swap HO computers and injectors onto the harnesses in the 80s cougars.

1. The motor ends up MFI or batch fired as you call it, and each bank is fired by one of the pins on the computer which is used to fire one of the HO's individual injectors. So the fuel sits in the intake port for a fraction of a second before the valve opens and draws it into the cylinder. There is the same amount of fuel being delivered as in the sequentially fired HO engine, so if you think it would run rich just because the fuel would sit in the port for a little longer, you're wrong, because it does that in the MFI setup too. The reason they have 14# injectors instead of 19# is because the upper intake is different, the throttle body is smaller, the cam is a lot different, the heads are different. They all flow less air which means less fuel is needed. The 14# injectors are not because it is batch fired.

2. It is possible that the diagram you have is for certain non HO engines and that the cougar's non HO engine harness is sequentially fired. This is probably the case, because the intake plate on top of the intake says "Ford 5.0 - SEFI" which stands for Sequential Electronic Fuel Injection. This is probably what is going on. The harnesses on cougars, t-birds, and probably crown victorias from 1986 up to 1994 which is when they started putting the 4.6 into cougars and t-birds, were all SEFI. I donno what engine that diagram is from but all of the non HO engines that I know of (are they used on another vehicle?) are SEFI.

Anyway, if they used the non HO on another car and it was MFI, then you might be right, maybe the car wouldn't run perfectly, but i still don't think that a batch fired 5.0 would run bad. The air/fuel mix would be good because the pulse width for each injector is exactly the same as if you were running SEFI, they just all fire at one time. But when you're talking about an engine where each cylinder is firing more than 7 times a second. I don't think the fuel is going to collect on the walls of the port if it sits for 1/7th of a second or less. I may be wrong, you may be right.