Oh man this is too funny....
"Not one person answered the question"
the true fireing order is 1-2-3-4-5-6, the fireing order is the order in which the cylinders fire in order of power strkes, which if you look at cam timing timeing and crank journal throughs and how the 2 relate it is indeed 1-2-3-4-5-6.
The fact that there are 3 coils and there are companion cylinders that fire at the same time has NOTHING to do with firing order.
If the original question was: "What are the companion cylinders that each coil connects to"
Then the answer would have been: "From left to right, with the secondary connections up, 1&4 6&3 5&2." Which by the way is the same order for our "non 3.1 (3x00) engines".
So to say that "this board has gone to shit" because you didn't ask the question in a proper manner or you yourself don't know jack, does not mean that those that had previously answered did not know either, you were looking for companion cylinders, not fireing order.
This as Daily has implyed has to do with wastespark, which fires 2 plugs at the same time, one on a power stroke the other on an exhaust stroke, which is not determined by the ECM but by the ICM and the pulses it gets from the crank trigger, the ECM just controls timing of the spark events, not which cylindrs fire in what order.
So in conclusion don't go off on the board, because you don't know what you're talking about and don't ask the question right, but you get the answer to the question you asked and think that no one knows, really, stop and think about it for a while.
:roll:
Maybe I should have just replied with "Use the search button". :-?