Our Mazda CX7 is making this popping noise between 2000 and 3000 rpm when accelerating aggressively. Noise happens while driving as well as when in Park. If you have any ideas on what this could be, please help us out. We're stumped on this.

New timing chain, tensioner, high pressure injection pump, phasers, and turbo. Let us know what you think.

 

Sounds like injector seals to me!