Thread: Need help, Engine Knock

Update, installed accessory belt, jacked front of car removed RF wheel and tried to get my head a little closer to eng. The sound is coming from the bottom behind the harmonic balancer only with the A/C on very fast clack clack clack metallic sound. When the eng is revved, noise disappates and comes back after a few seconds at idle. When the A/C is turned off the sound will clack every 5 or 20 seconds but at a lot slower cadence, 1/10 the speed.

Any other suggestions