Was just casually driving when the Check Engine Light came on. Was not flashing remained solid. Engine seems to stutter when idling at times if that makes sense. Would like to know where I should start before I take it to a mechanic. Thanks for your help!

 

I checked the valve cover and no leaks, also no oil on the floor. Not sure if the suggestion of replacing the valve cover gasket is what I need to do.

 

Are you the original owner? Has the car ever had its valves adjusted?

If the valves were never adjusted, I would start with that, and in the process, carefully verify that there are no recessed (cracked) retainers. Granted, since the valve cover will be off, I'd probably replace the valve cover gasket and spark plug tube seals while you're at it.

Then I would start with replacing a single coil pack, resetting the codes, and seeing if it stops the misfire, moving it from cylinder to cylinder.

Lastly, if it's never been done before, I'd also take a look at your spark plugs and make sure they're properly gapped and look healthy *and* they are properly torqued down (24 ft-lb).

 

Also check for leaks or cracking in lines and intake.

 

let us know what you find.

 

Check the valve lash, tight valve lash will cause a misfire, and if the valve lash is too tight for too long it will damage things. Valve lash being in spec is critical to engine longevity and performance. Most Hondas only ever need 1 valve adjustment in their entire life if the engine hasn't been taken apart, this car is no different, but it must be done, and must be done right.

 

Did you end up finding out what the issue was? I threw the same codes over the weekend, with same symptoms (stutter at idle sometimes). I’m thinking of starting with a DIY compression test first to rule out a bent valve.

 

I had this also. Seems really common with these cars, there are so many threads. Resolution for me involved running a bottle of fuel system cleaner through then sticking with Shell 93 octane only, replacing all four coil packs, replacement of spark plugs, and a valve adjustment. The wholesale coil pack replacement seems to be the thing that fully resolved the problem. If you have an AP1, the '04-'05 coil packs work perfectly and are half the price for OEM part numbers.

 

Along with valve adjustment... how old are the spark plugs and air filter? Most recent torque specs on plugs is ~ 21-24 ft-lbs. I use a torque wrench, to be sure. OEM NGKs.

Good luck, with your fix!