[Fireguy50]

Yeah, we need to know....

What computer you are using & how you program it
what size injectors you have
Which mass air flow meter

If you DON'T have a programable computer, then that's your problem :twak

 

[Fireguy50]

I would run at least a 38# injector

where did you pull that injector size from :lolup
30lb is the norm for blown 302's
which can go up to 490HP

 

[Fireguy50]

30# injectors require 155 l/hr pump

The stock truck frame rail pump is rated at 190 l/hr

The single intake pump won't cut the mustard, but if he has the dual pump set up it will be fine up to 600HP :thumbup

EDIT:
I'm shocked the people tha sold him the blower didn't sell him a better computer and fuel system so this wouldn't happen

 

[Fireguy50]

Now I feel like a noob :toothless :banghead

Quick search showed he was using a Mass Air system with 30# injectors

So could still be a programing issue or fuel system failure

 

[Fireguy50]

I need the numbers off the computer :thumbup

Is this the mass air computer for a Mustang?
Or is this a truck mass air computer :banghead

I know for a fact any Mustang computer can be tuned, cause I run one :toothless
The truck computers usually are not, which is why I tell people not to go that route.

But get me the numbers I'll see

 

[Fireguy50]

you got just the one intake pump?

If so You should upgrade to the older 2 tank setup which can handle upwards of 600HP :thumbup

 

[Fireguy50]

Alright dude you run your 30# injectors, I'll stay with my 38's...just because they are good up to a certain horspower doesn't mean their the best for the combo. I've run both and I'll stay with my 38's....oh and yes the ford mass air computer is reprogramable, all it is is a stock mustang computer.

It is very possible to get an injector TO big for a set up. Only reason to go so high with this set up is ego, and lack of research. If you injectors are too large, you loose any hope of gaining a diecent idle.

"Try to fill a drinking glass with a fire hose, without getting the table wet" GOOD LUCK

:lolup

 

[Fireguy50]

Fireguy, I have the one in-tank fuel pump.

Not the best fuel providing system. Go junkyarding :thumbup for some cool fuel stuff off some older EFI trucks.
You system flows about 120LPH
The older EFI trucks flow 190LPH

Much more fuel, less doubt's

 

[Fireguy50]

I've heard of those 2 cylinders going lean before, but I think that it's just a coincidence. It seems to me when they lean out, it's always in pairs. If you ask me, I'd say that the injectors were clogged/dirty. When you're running that type of setup, it doesn't take much to screw things up. Once it's screwed up, the computer tries to fix it, i.e. add and remove fuel/spark until it thinks it fixed the problem. If you were already close to the threashold, it may have pushed it over the edge. Who knows.

huh? :shrug
The Ford programing edits timing from base program to control idle and temp.
If he was running too cold right before it went lean, then maybe (just maybe) you could be correct. There is no way the computer sensed a lean condition and then sent the timing into KILL mode LOL