2000 mercury 150 efi xr6 wont run on cylinders 2 and 4

[Merc 2.5]

how can i check to see if they spray when they are in a manifold in front of engine behind the ecu?

I'm no efi kinda guy. But if u got fire and compression. U only got 1 thing left to not fire a cyl. U got ecu driver issue or harness issue. U need test light, volt meter sumthin to check and c if that injector is gettin its signal. Lots very experienced guys with this , u need b figurin out if those injectors firin. Swappin injectors wont do it. Cause if the pig tail ain't hot it won't t do any good

[zookimota]

all 6 injectors spray while i was cranking engine.
i had the injectors out so i could see then and cranked engine and all 6 spray.
i am baffled on why 2 and 4 make no difference when take plug wires off

[Merc 2.5]

Fuel ,fire,compression is good. Well just keep digging. I'm sure u will find it. I'd double check the bores if possible

[zookimota]

now i have no spark on cylinder 2 but have spark on 4 but still doesnt run on 2 and 4

[Motv18]

Does it have a shift interupt that will kill one side if it has one. Sometimes it’s only a neutral start if anything on some mercs others have it in the remote.

are you sure the fuel is good. Non That would affect all of them.

Have you check the ohms on the plugs. They can be busted

[zookimota]

fuel is good.
plugs are good.
new triggers and all new cdm modules

[zookimota]

if the box behind flywheel is bad will it kill fire to number 2 cylinder?
the triggers plug into it then wiring comes out of it to cdm harness

[Capt.Insane-o]

Yes #2 is the first cylinder to be dropped by the rev limiter and sequentially goes around the cylinders the deeper you get into the limiter

[tlwjkw]

i vote "control module".......................

[zookimota]

new control module and still wont run on 2 and 4
have very good spark on all 6 cylinders now

[tlwjkw]

new control module and still wont run on 2 and 4
have very good spark on all 6 cylinders now

Well $hit??????????????????????????????????????????????????????????????????/

[zookimota]

i am at a loss.
dont know what else it could be

[tlwjkw]

at this point ona computer last resort for me.. run it at night with cowl off.. take a well insulated screwdriver and start with tha plug wires and every wire associated with those two cylinders and see if got got any "leakage" anywhere

[Merc 2.5]

Find a old 2.0 or 2.4 a d replace everything electrical.

Edit. Should had said and swap over to ALL the 16 amp stuff and try it.

[zookimota]

i have swapped ecu and still no change