Not really familiar with the forums, just made an account to post this. I have an 02 civic ex with a misfire that I cannot figure out. Changed all spark plugs, checked all ignition coils, new valve cover gasket, new injectors, and still no luck. Mechanic buddy says I should just get a whole new motor but no one else has looked at it. Any idea what else I could try?

 

Is it throwing a check engine light?

 

Yes it has one for the ect sensor, but I also get a blinking one for the misfire after a minute or so at idle

 

Im battling mis fire issues myself on my 01 ex. At first mine had a code for multiple mis fires so i changed the plugs and coils with no change. So while checking for vacuum leaks i decided to take the intake off and clean the egr system (which was completely clogged) that cleared my mis fire codes, but i still have a code for catalytic converter below threshold and a small mis fire at idle..... Have you checked for vacuum leaks or run a compression test on yours?

 

Yup I checked compression. 180 across all 4

 

What is the code? P0116, P0117 or P0118?

Chances are the CEL for the ECT sensor could be related to your misfires.

 

P0118

 

P0118 - ECT Sensor Circuit High Voltage

Check the ECT sensor for failure, poor connections or loose terminals at the ECT sensor and the PCM, open wire between the PCM and the ECT sensor and finally a bad PCM.

If replacing the ECT is necessary, use a OEM Honda sensor.
Good idea to check your thermostat too. Is it the original?

 

Any luck with your mis fire problems yet?

 

Sorry for the late response but I put new injectors in and after a bit it cleaned right up (I assume it just needed some time to run fuel thru the new injectors). As of now no misfire

 

Strange because a P0118 code mentions nothing about replacing fuel injectors or even their circuits. It's all concerning the ECT sensor and its circuit.

But at any rate, keep on truckin' ...

 

I forgot to mention I also put a new ECT in
But that was after the misfire was already gone