A little history here: 1998 f150 reg cab short box XLT 4.6L/auto Coil packs not COPs Bought the truck about a year ago for cheap. Needed tires, rear wheel bearings/seals, had a misfire. Started slow and easy with the wheel seals and bearings. Once that was done I put new plugs and wires in. Then new tires. Also did fuel filter as well for good measure. After ~ a month or so the misfire came back. This time in full force. I went to vatozine and had the codes ran. i got 2 misfires #4 and #7 along with an EGR code (i cleaned out the EGR after) and rear O2. I swapped wires for new, plugs for new, and coil packs for new to no avail. This weekend im gonna try cleaning out the motor with seafoam and do a comp test. If that has no effect i will do a borescope (if someone i know has one) to see if anything down where i cant see is bad. Any other ideas?? Im actually very mechanically inclined and have worked in the field. Just trying to get advice since we all know this is a common issue. Going to add this so everyone knows the sypmtoms: Rough idle No power on take off Misfire codes Thing i have done: New plugs TWICE New wires TWICE New coil packs New injectors Tested power to injectors and everythings good Seafoam Higher octane gas
Just a heads up incase you hadn't heard before a cop is coil on plug , it's the ignition coil for each cylinder. Just incase you hadn't heard that term before
Ive heard it belive me. This truck has the coil packs not COPs and after changing coil packs it didnt help any.
I used NGK plugs (ive used them on all my vehicles). As far as a vid, im at work but will shoot and post one tomorrow.