I've got engine misfire codes on my '05 Odyssey and wanted to get some advice on where to start. The codes are P0301, P0303, and P0304.
Couple of notes:
Tune up was done last year. When we first bought the van (9/15), it had random misfire codes. It had actually just had a tune-up, but I didn't know that at the time, so we went ahead and had another one done. So, it could be related to the dreaded VCM issue, but for what it's worth, as mentioned, the plugs are new (and iridium).
PCV valve was replaced in the last few months.
A few months ago, same time frame as the replacement of the PCV valve, I had misfire codes. Turned out to be the PCV valve (I had cleaned off the old PCV valve, and its o-ring was just shot, totally worthless, so after putting it back it started misfiring, hence the new PCV valve). Anyway, in addition to the PCV valve replacement, I checked the coil packs at that time and all were fine.
Hopefully the information above eliminates a few steps I should try.
Thanks in advance for any help!