p0301 only when pushing
 

Hi, 2014 GT86 here, 77k km (47k Miles). Yesterday during a trip 200km (125 miles) away from home, I got a CEL, p0301 misfire on cyl 1 doing an overtake, car stuttered e CEL flashed few seconds, luckily it was a safe condition and nothing happened. I got back Home without pushing on the throttle too hard, no CEL ever appeared, and even got to 6k rpm slowly. When the CEL pops up I get low idle rpms (about 500) and a slow throttle response for few minutes, then it gets back to normal, if I accelerete gently (urban use), everything is as always, no stutters and no CELs.



No FI - decatted - ecutek - stock muffler - afr on full throttle 12.5
a few trackdays on the back, oil changed every 10k Km (6k miles) 5w30.



I'm bashing my head to understand what can it be, no other codes popped up, only this p0301. Bad spark plug? Bad coil? Or one of the injectors? How can I diagnose and fix this issue? Any help is appreciated. Thanks.

Hello xAle33x and welcome to our forum - :clap:

You might try disconnecting the battery for a spell, and see if the ECU will clear the code. Maybe it was just a hiccup. If it comes back, you may try swapping the COPs to see if the CEL follows to the other cylinder.

If you can look at the AFR at the time it happened you can tell if its spark/fuel depending on if it went lean or rich.