I have a 1997 K1500 Silverado with the 5.7 Vortec engine. For the past 2 months I have been battling this truck. The problem I'm having is that after 30 minutes or so of driving to work it starts misfiring and backfiring. The whole vehicle shakes and looses power. I've found then when this happened, the spark plugs in bank 2 are completely fouled with carbon. The temporary solution I've come up with is to clean the plugs in bank 2 with brake parts cleaner and a brass wire brush before I leave work. After I do that it runs fine, just like it's supposed to. Something keeps fouling the plugs in bank 2 and I can't figure it out. The only codes I have on the vehicle are:
P0154 - O2 sensor Bank 2 sensor 1 no activity
P0158 - O2 sensor Bank 2 sensor 2 high voltage
P0161- O2 sensor Heater circuit Bank 2 Sensor 2
The truck does not have any cats on it. Could someone help me get to the bottom of this?
Here is everything I've done to the truck while trying to fix this issue:
Cleaned the carbon out of the throttle body and upper intake plenum
Distributor cap and rotor
Spark plugs and wires
Multiport fuel injector upgrade
Fuel filter
Mass airflow sensor
Crank position and cam position sensors
I have new coolant temperature sensors in the mail, not installed yet
P0154 - O2 sensor Bank 2 sensor 1 no activity
P0158 - O2 sensor Bank 2 sensor 2 high voltage
P0161- O2 sensor Heater circuit Bank 2 Sensor 2
The truck does not have any cats on it. Could someone help me get to the bottom of this?
Here is everything I've done to the truck while trying to fix this issue:
Cleaned the carbon out of the throttle body and upper intake plenum
Distributor cap and rotor
Spark plugs and wires
Multiport fuel injector upgrade
Fuel filter
Mass airflow sensor
Crank position and cam position sensors
I have new coolant temperature sensors in the mail, not installed yet