I have been battling several different engine codes on my Silverado. All are bank 1 multiple engine miss fire, all cylinders (1,3,5,7), O2 heater circuit issues, running rich, stability traction control issue, that cuts power and causes backfires in the intake. I have been trying to fix these codes. I replaced both o2 sensors bank one, which fixed a couple codes, replaced the intake gasket, put on another set of ignition coils and wires from another motor I have sitting around. Tested the voltage to the coils, put a test light on the spark plug wires to make sure they were firing, still won’t fix the P0300 code. The plugs and wires only have 10,000 miles on them. Now I am also getting P0132 high voltage O2 sensor 1 bank 1 and high voltage on O2 2 bank 1. I have a hand held scan tool. I have been checking the STFT and LTFT . I have had -24 readings on STFT and some -30 on LTFT. I have also watched as I drove the truck and the O2 sensor voltage was fluctuating. Tonight I went to check on the voltage to the O2 sensors, to make sure I don’t have a wire issue. I put the key in the on position and as soon as I did that the battery started to drain fast. In 15-20 minutes it dropped down to 8.44 volts. Then I was getting messages to check charging system, Stability traction control, Service trail brake system. I put the battery on a trickle charger and disconnected the negative cable. I checked the voltage before I disconnected the cable (keys were not in the truck) and after. There was almost a full volt difference.
Do I have a fried computer? Thoughts on the P0300 code? I have not checked the injector, only the voltage to them, which was good. I don’t have issues with Bank 2 at all. The catalytic converter on bank 1 is about 20 degrees warmer than bank 2.
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