P0301 Code Cylinder 1 Misfire 2003 Honda CR-V EX Automatic
I am having a persistent P0301 trouble code misfire cylinder 1 on my 2003 Honda CR-V EX Automatic Transmission with 199,556 miles. The CEL shows up after every trip driven and it always gives me that P0301 code. The spark plugs and ignition coils have been replaced. I used a Bosch 9614 and ECCPP ignition coils back in January 2020 when I had 193,990 miles. Just yesterday, I replaced the ignition coils with Duralast C1382-4 just for the peace of mind of having higher quality ignition coils. I did test cylinder 1 and 2 ignition coils by switching them, and yet I still have the P0301 error code.
I did not check my spark plugs to see if there is any gunk on them because I don't think they are in bad condition considering that they are relatively new. Another thing to note is that I did not test if the new Duralast ignition coils are going to trip another CEL as I did not drive an entire trip for the computer to trip another CEL. I used to have misfires on all 4 cylinders due to having a P0325 code before I replaced it with a new OEM knock sensor last week.
Could it be a compression issue? Vacuum leak? I really am confused about how I should go about fixing this. I do not seem to have any issue starting the car, accelerating, driving at high speeds 70+ mph, idling, no rough or irregular engine sounds, no smoke, or any other noticeable problem when operating my vehicle. It sounds good and feels good since I replaced the knock sensor last week. I am confused about the persistent P0301 trouble code.