Hey guys. So I have an interesting problem with my mustang. It's has 131,XXX miles on it. Whenever I drive and push the gas pedal 75%-WOT, I hear a clinking noise. It's really annoying. Someone please if you can help me let me know! Thanks

 

I'm not sure here but it might be pinging, possibly detonation. I had the car timed last week. I replaced the pcv valve and a vacuum leak. Replaced the harmonic balancer as well. I'm completely stumped here. I'm running 91 octane. Some one please help me out here. Does it sound like maybe it's engine or drive line?

 

It is hard to say what the problem is without having the car in front of me. It could be a collapsed lifter, or exhaust leak, or detonation or any number of other problems. Does it reproduce if you go to 75%-WOT with the car parked or does it only happen when the car is moving? A video (with audio) would help a lot.