It's back, and this time back with a vengance.
P0307 (cyl #7 misfire)
Those who have followed my plight know this saga began a year or more ago. Various things at various times have solved or rather mitigated the problem to a greater or lesser extent for a while, but this time it's back and not quite but almost a steady-state hard failure. Clearing the code and it comes right back within the first 5~10 miles of town driving.
'97 Ram 1500 5.2L, 80k miles
Work done over the past year to date: (all Mopar parts) new coil new plugs new wires new rotor cap plug wire rerouting TSB applied flushed injectors (several times) cleaned combustion chamber checked compression (135~144 lbs all cyls)
52.8 psi fuel pressure swapped #5 & #7 injectors, problem stays on #7Problem seems to occur most often when decelerating from 25~30 mph to a complete standing stop in gear, i.e., approaching and then sitting at a light with your foot on the brake. All of a sudden you feel a faint flutter in the idle and 10 secs later the MIL lamp is on. Sitting in the shop idling in gear and you can see the misfires counting up, 8~10 in the course of a couple minutes, all on #7. The only code being set is P0307.
What next, Doctor?