Pinging or knocking in my 2000 GT 4.6L

[Badass_yellowGT]

pinging or knock is usuaualy related to a timing problems or bad fuel. does the car have a timing adjuster or chip and does it do it in all the gears or just one ? mines does it in 5th under 1500 rpm if it`s real bad don`t drive the car it sounds like detonation and can destroy the engine.have it checked epsecilay if you can feel it in the engine compartment