PALiftedKK wrote:
if you haven't already spark plugs should be changed. a fouled o2 sensor is unlikely, they either work, or they don't. also, just in case id check the battery and alternator output in volts.
to confirm my thought on the spark plugs though, try loading up the rig with maybe 300lbs of cargo and go up a hill. if she struggles (misfires) time for new plugs.
Thanks for the response. I took your advice and replaced the plugs yesterday. I also had the engine cleaned. Lots of carbon build up in there. And sadly, the problem persists. The plugs needed to be replaced anyway, so no harm no foul there. I just recently replaced the alternator (2 months ago) so I don't think that's it.
Since I'm getting misfires in cylinders 3 & 4, I'm wondering if it could be the coil pack. I know older models have coil packs on each cylinders, but as I learned yesterday, the KK only has coils packs on the driver side cylinders. I'm assuming they align with the passenger side cylinders. This would make sense since cylinders 3 & 4 share a coil pack, right? The OEM part is only 25 bucks. I may try replacing that and see if it makes a difference. Thoughts? If that's not the case, I'm not sure what to do.