P0303 Ford - f150

Question

Sends a p0303 code which is a misfire and its just a random misfire happens mostly while in idle or letting of the gas and also while in traffic that is speeding up and slowing down is this just adirty fuel injector or do I need to start changing plugs or injectors to fix

Answer 1

Hi there,

I would actually start with the ignition coil on cylinder # 3. It is more common then a bad injector, especially on a single cylinder like that. The odd thing about coils is they sometimes only misfire when conditions are right. In other words, they can fail without a constant misfire. I have seen some that were fine when cold, but once they get up to temp they no longer fire properly.