Stft

Jhill

Interesting article, I’ve never done it that way but you may want to reread it. It states if your stft does not go over 15% then you are looking at ignition related, if it does go over 15% and into the 20’s then you have a fuel issue. Your data is showing 21.4%, also you have changed all plugs and swapped coils and misfire has stayed on cylinder 6. You have not done anything with injector testing ie injector balance test or scoped the injector voltage and amperage pattern vs other injectors (looking for pintle hump etc). Your stft 21.4% is trying to add fuel sensing a lean mis.