Always been wondering what the cause of this noise is on start up? Sounds like a chatter like spinning the prize wheel or someone playing the spoons or something lol. It only lasts a few seconds or so. It was there with my old engine aswell and with new engine so I would think it's within the engine. Could it be a cracked flex plate or worn tooth on the flex plate or something? Otherwise it runs great. Mostly happens on the first start but sometimes other times aswell but mostly on a cold start I think and it doesn't happen everytime but sure does sound annoying. I turn the ignition off and start again and it doesn't happen the second time starting. Anyone experience something like this and resolved it or anyone have any ideas?

 

probably just piston slap, common on VG engines when cold

 

Make a video for us. Descriptions of noises are so subjective it's almost impossible to say

 

It's the prize wheel.