Noises while under load and high rpm

[PrisonMike]

02 Protege5 5 speed, its making a pinging like noise whenever its hot and im putting a load on the engine or going up a hill.
Ive been trying to fix this for a long time. I've used high octane gas(chevron), seafoamed it a couple times, used Techron Concentrate a few times,
done the timing belt, replaced the knock sensor, air filter, intake accordion tube but its still making the noise.
Also it makes a whistling sound at wide open throttle at 4,500rpm and above.
Any ideas?

 

[SoonP5ismine]

did you look at the air intake hose right next to the battery? mine had a crack and I had changed it 2 years ago.

 

[P-Funk!]

Tune up. New plugs and wires.