Flaith said:
If it were a specific coil, it would probably also throw a P030X (x = cylinder misfiring) if I understand it correctly.
P0300 is random so i'd be looking system-wide. EGR, O2 sensor, vacuum leak. Are you noticing the engine stumble, have trouble starting, or is down on power on the freeway?
Does the exhaust smell like rotten eggs?
When is the last time you changed spark plugs/coils/etc?
Spark plugs and O2 sensors are relatively cheap, I would start there.
Just read about a service bulletin that mentioned bad contact on Fuse 27 causing a DTC code? idk but might be worth also checking it out, removing the fuse, cleaning contact, etc.
I have heard spark plugs are a b**** to change on these trucks and unfortunately am not the most handy, outside of the basic stuff.
Yesterday morning I do think it was driving a little weird and down on power on the freeway, but then again, the wind was pretty crazy from the front and it could have been in my head.
Haven't noticed any weird smell of exhaust. The truck has always made kind of weird noises (sometimes rattling/gravely sound) at lower speed and RPM, but every F-150 forum seems to say this is "normal". I have always wondered if the occasional rattling/marbles sound at lower speed acceleration could possibly be from the 87 octane.
Love the truck overall, but it hasn't been the smoothest/quietest ride I have ever experienced. Going to take it in to a shop near me I think. Was just hoping maybe it could be something that just needs to be reset.
