2021 Silverado 5.3 p305 code

[Unclejer]

I hear a knock when I start it, the spark plug is soaked with gas like it’s not burning. So the knock I am hoping is from fuel.

i replaced spark plug, i seen spark from coil pack to the fuel plug wire (all new wires now also). I even switched swapped coil pack with #3.

i thought maybe one for dumping too much fuel and replaced it.

compression while cranking is around 155-160psi.

is there something I could be missing?

If it was valve or lifter issue I would think compression would be low.

any help is appreciated.

[silveradosid]

if the spark plug was soaked in gas, i would say you have an injector problem

[Unclejer]

I put a new one in, so unless there is an electrical issue with injection then idk.

 

[Sneaky pete]

It looks like you covered all the bases. About the only thing left I can think of would be injector voltage,harness or bad new injector.

Edited February 17 by Sneaky pete
Ask about code, was stated in title.