no codes, severe pinging 04 silverado 2500hd 6l. low miles on tune up parts,

What is your question?

have tried premium fuel. no egr valve for this model. knock sensors measure 99.2 ohms thru wire harness. should be 1500 to 2500 ohms says dealer. planing to change knock sensors and harness. big job for a shot in the dark.

What makes this problem better or worse?

doesnt matter if cold or hot

How long has your 2004 Chevrolet Silverado 2500 HD had this problem?

1 month