Truck had been running strong for months. Last weekend I got a P308 - Cylinder 8 misfire detected. Yesterday, I replaced the spark plugs and installed a new set of Kingsborne 8mm spark plug wires. After the repair, the truck fired right up and ran fine on a short test drive. However, took it out today and codes came back after ~9 miles of driving. Service Engine Soon light flashes periodically then stays on. Engine has a noticeable miss / power degradation.
P0300 - Random/multiple cylinder misfire detected
P0308 - Cylinder 8 misfire detected
P0327 - Knock/combustion vibration sensor 'A' circuit low
During the repair I tested cylinder 8 injector with a 9v battery and it seemed to be working (could hear a click and fuel flowing from residual pressure). I replaced the head gasket and had the heads rebuild about a year ago (+/- 1,000 miles).
I'm going to check compression and vacuum in the morning. Provided they both look good, should I replace the coil packs and/or injectors, or is there another logical troubleshooting path before pulling the intake and throwing more parts at the beast?
P0300 - Random/multiple cylinder misfire detected
P0308 - Cylinder 8 misfire detected
P0327 - Knock/combustion vibration sensor 'A' circuit low
During the repair I tested cylinder 8 injector with a 9v battery and it seemed to be working (could hear a click and fuel flowing from residual pressure). I replaced the head gasket and had the heads rebuild about a year ago (+/- 1,000 miles).
I'm going to check compression and vacuum in the morning. Provided they both look good, should I replace the coil packs and/or injectors, or is there another logical troubleshooting path before pulling the intake and throwing more parts at the beast?