Driver-side bank not firing! Please help
I have a 2003 F-150 4.6L V8.
So here is how it started… I was driving down the road and realized I had lost a little power. I could not get over 50mph. So I turned around and tried to drive back home thinking I could fix it. On the way home, I lost more power and couldn’t make it. Had to get towed. I get home and hookup my cheapo scanner to find p0308. Well I would assume that’s why it originally lost a little power but not why the whole driver side bank stopped firing afterwards. I can unplug each ignition coil on the driver side and nothing happens. It remains running on 4 cylinders. I can even unplug all 4 coils and injectors at the same time. No change at all. I swapped coils around, nothing. I even went ahead and bought all 8 brand new ignition coils and spark plugs. Nothing. I checked for spark by starting it with each coil and spark plug pulled out. I see spark. I checked for fuel by pulling the fuel rail off and starting the truck. I see fuel. I checked all over for vacuum leaks. I sprayed everywhere with WD-40. Even used a butane torch to check. No luck. I pulled the catalytic converter off thinking it was clogged. Nothing. I even swapped the o2 sensors. The firing side had carbon build up on it. The non-firing side did not. I checked oil and coolant. They are not mixed. What do you guys think happened to the truck? What can I do next? Is it time to start tearing the intake/top end apart? Timing related? Computer related? Thanks! |
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