So yesterday on my way to work my CEL came on again. It came on less than a month ago when I had three of four cylinders misfire https://honda-tech.com/forums/honda-s2000-5/cel-%3D-misfire-my02-2544062/. I replaced all the plugs and all was fine until yesterday. I checked the CEL and it was a P1399, and P0304, I was concerned that the top electrode had broken off again. When I left work my CEL didn't light up again, I am very confused as I have never seen the CEL stay on for a few hours then turn off. When I got home I checked cylinder #4 (nearest to the firewall right?) which had the misfire and the plug looked fine. I then started to think that it may be the ignition coil but I replaced that coil May of 08'. I ended up switching the #4 coil with the #1 coil. So far today the CEL is still off, anyone have any advice on this one? Thanks.

 

So after driving around for two days probably 100 miles or so the check engine light is still off. I was hoping it would come back on so I could see if the problem was the coils. The car however does feel slugish I only went past 6k rpms once or twice and vtec does not feel normal. I'm going to do a compression test this weekend. So is it normal for a CEL to stay on for 50 miles then just turn off?