05 5.4 fx4 miss...scratching my head
I am helping a buddy with his 05 f150 fx4, 160k miles bought used about 2 months ago. out of the blue it starts missing and he feels a lot of vibration through the body, check engine light comes on.
he went and got codes pulled on it when the check engine light came on.
p0303 and p0012.
we have replaced the #3 COP as it test outside spec at 1 ohm rather then 0.55 ohm. that changed nothing.
we read up a lot (on here mostly) and he paid a shop to change the plugs, they scanned the codes again and got misfires on #3 and #4, and replaced all 8 plugs.
we then tested the VCT solenoid on the passenger side, it was at 2.6 ohms, well outside the 4-14 ohms to be expected, so we replaced both of them (figured the other one might as well be replaced with the miles on the truck).
we have not had a chance to drive again (we are firefighters on duty), but at idle it still seems to be running too rough.
some other thoughts:
i can clearly hear the clicking injectors, but if I unplug them on the passenger side bank it seems to make very little difference to how the engine runs at idle. possibly going to swap injectors from bank to bank.
the rubber hose for the evap emissions system on the passenger side of the intake manifold is dry rotting so badly you can touch it and get covered in black powder.
what would you do next? we will pull codes again when they come back after driving (tomorrow when we can leave work), but i am at wits end.