According to everything I've read, the 88's are not true SEFI, instead just batch-fire.
If I understand the process correctly, this means that injectors 1, 2, and 3, all fire at once, and then 4, 5, and 6 all fire at once.
What I don't understand, isn't that a HUGE waste of fuel?? If this is the case, then when one batch fires, two injectors waste their whole supply on a closed intake valve. That blast turns into liquid fuel on the surface. The valve opens, but we all know that liquid fuel does not combust very well in a cylinder. Do this 6 times over again, that's a ton of wasted fuel.
What am I missing here?
I know 89-90 3.8 MN-12s use SEFI and SD computers. I'm pretty sure that the computers don't swap in as more wiring is required to run the injectors sequentially.
5.0s are SEFI;)
Actually 1, 2 & 4 fire and then 3, 5 & 6...
There is just a portion of the fuel charge that's necessary for combustion fired at the intake valve, so it takes three injector firings to have the fuel at the valve when it opens... Not really wasted, but true SEFI can meter the fuel a little more precisely...
But wouldn't the fuel that is fired prematurely turn to liquid as it hits the surface of the valve?
Isn't the whole idea behind fuel injection is that it is able to mist the fuel and create a better AFR?
Nope, heat and vacuum keep fuel in a semi gaseous state... Have to remember that even idling at 600 rpm, the valves are opening 5 times a second...
o, i c
Why would it go in that order? firing order an a 3.8 is 1-4-2-5-3-6
on a
3 6
2 5
1 4
cylinder setup