09 Subaru Outback 4 cylinder. I replaced the spark plugs and cords and the codes went away for about a week. I have a friend who thinks its my fuel injectors but it could also be my coil. How do I tell what it is?
Swap those components to a cylinder without a miss, and see if the miss moves to those cylinders.
Swap the coils first. Then see if the misfire moves. If they don’t, then repeat with injectors.
Can that still be done with a coil pack?
Thought you had coil on plug. Sorry. But you can swap wires to check them.
What kind of wires are they? I have bought new wires at autozone and they turned out to be pure junk. Lasted about a week and I had to put the old ones back on. Now I dont skimp on them.