Untill the engine run flag is set there are no cyl trims adjustments.
The run flag settings comes from 2 tables 22b4 and 22bd.
Code:
#1 inj - #7,#2 cyl
#8 inj - #2,#1 cyl
#4 inj - #1,#8 cyl
#3 inj - #8,#4 cyl
#6 inj - #4,#3 cyl
#5 inj - #3,#6 cyl
#7 inj - #6,#5 cyl
#2 inj - #5,#7 cyl
The fuel robbing theory is really interesting and explain some of the issues I have had before. Running great when cold and turns to crap slowly with heat build up.
Since the end of injection target is set to inject fuel straight into the cylinder at colder temp, there isn`t anytime left for fuel to move around ports. When the engine gets warmer the target slowly move to 180* for y and f-body and there is 180* duration that fuel is sprayed and stays in the port before the intake valve opens and it get sucked in the cylinder.
Another addon to the theory that is not mentioned is the valve overlap, under some circumstances it provides natural egr effect and can reduce the oxygen concentration in the mix.
So there is 180 degrees before the fuel get sucked and can move to other cylinders. I made a quick chart at possible fuel robbing combos the first is the injector firing and than cyl#s intake open at 0* and *90 after end of injection occured for the given injector #.
If #3 don`t fire #4 and #8 can get really lean.
I will have to do another chart for least resistance path for fuel robbing and link it to the previous chart to find the most possible combos. The diagonal path seems with the least resistance.
6,8 gets fuel from 1,3
5,7 gets fuel from 2,4
And between adjacent ports could be the other least resistance path
1<->3
5<->7
2<->4
6<->8
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