2004 5.3 p0300 code

[Solomonchevy]

Hi everyone, my truck has been running fine with the codes p0327, p0332 for knock sensors even thought they have been replaced recently.

 

A few days ago, I ran her hard through some mud and trails and developed a p0300 code for random misfire. This seems to affect the idle mostly as now it ‘lopes’. These are the only 3 codes showing, but I checked the voltage on o2 sensors and bank 1 is reading low and jumping up.

 

I have checked for obvious vacuum leaks and the alternator had been replaced recently.  Is this a simply a bad o2 sensor or is the low voltage a symptoms of something else.  Thanks in advance I just wanted some advice beforehand I go throwing parts into her.

[riverbanks]

This was brought up not to long ago,davester replied,in the past,k.s. problems can lead to a 300 code,so a crankshaft relearn procedure might be needed,start with the first codes,new,quality k.sensors, and wiring pigtail

[utah33]

I had a p0300 I fought for a year. After replacing all the O2 sensors, the crank sensor, spark plugs & wires what ultimately fixed it was the fuel injectors need a professional cleaning. After I got the injectors cleaned the code has not returned. It has been several months now. This was on a 2002 5.3L Silverado.

Sent from my SAMSUNG-SM-G890A using Tapatalk