93 suburban engine ping code 43 sometimes?

[JeffStark]

I have a engine ping on my suburban and it has had a code of 43 in the past how do I get rid of the ping?

 

[zora]

Check for a bad knock sensor or the wire harness going to it.

 

[JeffStark]

I put a new knock sensor in it it did not help I put a used knock sensor in it it got rid of the code but still pings I check the wires they seem okay any other clues?

 

[zora]

1) Open or shorted knock sensor
2) Loose knock sensor
3) Excessive mechanical noise within engine
4) Improper or incorrectly installed PROM or CALPACK in the ECM or defective ECM
5) Intermittent open in the EST line to the ignition module