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Old 11-14-2012, 04:18 PM   #2
Scooby Specialist
Member#: 200436
Join Date: Jan 2009
Chapter/Region: MWSOC
Location: Lawrence, KS
2004 Forester XT


Originally Posted by CreSTI View Post
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:

3 4
1 2

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.

Good luck.
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