Originally Posted by CreSTI
I have a misfire in cylinder 4, P0304. Are all the coil packs interchangeable? Which side is cylinder 4? I want to swap the coils to see if the CEL follows it.
Coil packs are interchangeable. Cylinders go like this:
If your misfire doesn't follow the coilpack, check your plugs, and if they are ok, then you NEED to get a compression test. Also, with the engine running, pull off the oil fill cap and see if any puffs of smoke come out. If so, that's a sign of blowby, which can be caused by a cracked ringland.