Cylinder 7 Misfire Tapping Noise
Well after a good run, it seems the truck is fighting a Cylinder 7 misfire that came up today. I think my son hasn't been diligent enough with monitoring oil levels based on the fact it was 1.5 quarts high and there is a p0521to be
2011 CHEVROLET Silverado 5.3L V8 3GCPKSE3XBG305530
Odometer: 257,790 mile
P0307 Cylinder 7 Misfire Detected
P0420 Catalyst System Efficiency Below Threshold Bank 1
P0521 Engine Oil Pressure Sensor/Switch 'A' Range/Performance
I'm noticing a sporadic tapping metallic noise at idle, where do I go from here? Thinking of pulling the valve cover an taking a look. I'm guessing broken push rod, lifter, or rocker arm.
What is worst case scenario?
What is best case scenario?
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As suspected, definitely full delete time.