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

[zookimota]

i have replaced all cdms and new triggers
i have swapped ecu with another and still same problem.
i even swapped injectors to different positions with no change.
i have spark on all 6 cylinders

[perfmarine1]

You still running oil injection? Compression and leak down numbers?

[zookimota]

yes still running oil injection.
105 to 110 on all 6 cylinders

[zookimota]

wondering if the controller can be the problem.
the one on top of motor behind flywheel.
the triggers go to it then out of it to the cdm modules

[Motv18]

Would almost say time maybe. But you have new cdm on. Have you swapped them.

after that you in the harness or have busted reads and got compression from sucking in through the exhaust.

literly baffles the mind with compression spark and fuel.

[zookimota]

reeds are good.
have heard the controller box controls injector timing.
i just dont know what else to try.
was exactly the same cylinders before we replaced all cdm modules and triggers

[zookimota]

can anyone help me with what else i can try to get this figured out?
i unhooked shift switch and heat sensor and no difference.
i have switched stator wires around also and no difference

[Capt.Insane-o]

A 555 motor I'd look for a running voltage issue after that the ECU will be need to be sent in and checked for faulty drivers.

[zookimota]

where do i check running voltage at?

[Capt.Insane-o]

Alternator. Sounds like you lost a couple injector drivers I would check that route first.

[zookimota]

14 volts out of each voltage regulator

[Motv18]

Can’t remember if it possible but check the injectors are plugged in the correct plug. (Like crosswired sparkplugs)

you can pull one and spray in a bottle to check functionality. Or pull the spark plug and smell for gas in the cylinder. Both are a little spooky but doable.

are you positive it’s only 2 and 4

[Merc 2.5]

Dont the driver in ECU run 2 injectors at a time? In other words 3 drivers 6 injectors? Capt said it earlier. Need see if u got power to those injectors or see em sprayin

[zookimota]

i had the injectors out and switched to different cylinders but still wont run on 2 and 4.
if you unhook cdm or take plug wire off on each cylinder it makes a difference except on 2 and 4

[zookimota]

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