2007 Ford Explorer 4.6l 3v Missing/Bad Coils
I just got a 07 Explorer Ltd with the 4.6l 3v engine that sounded like a lawn mover when running. The CEL light on with codes P0171 Bank 1 system lean,P0300 random misfire,P0304 Cyl 4 misfire, P0305 C...
Forum Discussion
UPDATE
Drove the truck a little more and the CEL light came back on and the code was for a misfire in cyl#5. I removed that new coil and discovered that spark plug was already loose and when removed the tip stayed in the head. This must be why previous owner got rid of it (I got from donated auction).
I bought the Lisle spark plug removal tool from NAPA after watching YouTube videos on it. It was fairly straight forward and tip came out after 2nd try. I replaced that with new OEM plug with anti seize on barrel of plug and threads. Reset CEL light and went driving again much smoother but still a miss with code for misfire in cyl #3. Pulled that coil and saw a pile of dirt in plug hole. Blew sediment out after spraying carb cleaner using air. Reconnected everything and took truck out for drive and still a miss now code for cyl #1. It was getting dark so removed that coil and saw some sediment in the plug hole and cleaned it out. Reused that coil and buttoned it all up and after the normal trip no codes were triggered but still a very slight miss but much less than before.
I'm going to drive it some more to see if the computer can point me at the right cylinder otherwise I might try to replace the other plugs only if I can use a smaller impact to remove the plugs from a warm engine. Many say that's better than Fords process of using ratchet wrench going back and forth 1/4 turn at a time on cold engine after spraying penetrate/cleaner down spark plug hole.
Drove the truck a little more and the CEL light came back on and the code was for a misfire in cyl#5. I removed that new coil and discovered that spark plug was already loose and when removed the tip stayed in the head. This must be why previous owner got rid of it (I got from donated auction).
I bought the Lisle spark plug removal tool from NAPA after watching YouTube videos on it. It was fairly straight forward and tip came out after 2nd try. I replaced that with new OEM plug with anti seize on barrel of plug and threads. Reset CEL light and went driving again much smoother but still a miss with code for misfire in cyl #3. Pulled that coil and saw a pile of dirt in plug hole. Blew sediment out after spraying carb cleaner using air. Reconnected everything and took truck out for drive and still a miss now code for cyl #1. It was getting dark so removed that coil and saw some sediment in the plug hole and cleaned it out. Reused that coil and buttoned it all up and after the normal trip no codes were triggered but still a very slight miss but much less than before.
I'm going to drive it some more to see if the computer can point me at the right cylinder otherwise I might try to replace the other plugs only if I can use a smaller impact to remove the plugs from a warm engine. Many say that's better than Fords process of using ratchet wrench going back and forth 1/4 turn at a time on cold engine after spraying penetrate/cleaner down spark plug hole.
