[John Clark]

I have an 09 Odyssey EX-L with the VCM engine. A few weeks ago it started to run rough and the Check Engine light began to flash. The P0301 code indicated a misfire in cylinder 1. The mechanic swapped the coil from cylinder 1 to cylinder 4 and the problem went away. A couple of weeks later the engine began running rough again. Diagnostic code indicated misfire in Cylinder 4. I bought a new coil and replaced myself in cylinder 4. Problem disappeared and van ran great for about 2 weeks. This morning upon start it immediately idled rough and after a couple of minutes the check engine light began to flash. The diagnostic code indicates that cylinder 1 is misfiring again. Is this a coincidence that the coil for cylinder 1 is now bad or could something else cause Cylinder 1 to misfire. Vehicle currently has about 225,000 kms and all maintenance has been performed as scheduled. This included new plugs and timing belt when called for at about 160,000 kms. (100,000 miles).

Do nothing else. Leave all the codes and drive it to the dealer for new piston rings and spark plugs on those cylinders under warranty. Then when it's all done with that work purchase a VCMuzzler as suggested above.