DirtyJohnson

What would make it? It almost sounds like a rod knock but it is before it starts and while cranking. Engine runs fine and it has only done it a few times. Starter maybe? If I can get a video with the sound I will post up.

blue thunder

My guess would be slight hydro lock of the engine which the starter is able to overcome. Your exhaust may be leaking water into the engine while sitting.

Philm

It could be rod knock, happening before the engine builds oil pressure. Had an old jeep that would do that, until it finally spun some bearings.

PremierPOWER

Check the easy stuff … I had a couple of loose bolts on the idler pulley that sounded exactly like a rod nock.

firehawkcat

Agreed check the easy stuff 800 ponies could rattle stuff loose

US1 Fountain

iTrader: (1)

Had a WP pulley knock while cranking. Loose screws. When running sounded fine.

skydog

Yes look at all rotating parts on the front. Then check starter and could have a cracked flex plate good luck!!!!