all new sensors. new motor and trans. new plugs, wires. the motor consistently misfires (after 45 seconds) and runs very rich on pass side only. here is the weird part, when I start the truck it runs fine for about 45 seconds then gradually begins to misfire and "load up" on the bank 2 cylinders only. another 30 seconds then the mil flashes and I shut it off. 150 lbs. across all 8. 50 lbs fuel pressure steady. new map new crank pos new cam pos new knock sensors and pigtail. new intake gaskets also. fuel pressure holds after shutoff so no stuck injectors. mass air sensor is next. could somebody please tell me why my truck is loading up on bank 2 only? this is my livelihood. pull all plugs , driver side: perfect color. passenger side: thick soot deposits in very little time. swapped coil assemblies no change. HELP!!! Follow up: sorry i should have given truck type and year. It is an 02 sierra. And you were correct it was a bad 02 sensor. I switched sides and the code popped up in the opposite bank. $80.00 later and i have been MIL FREE FOR 30 miles now and running tip top. Thank you !!!!
