just bought truck and at idle it sounds like a knock in the oil pan, if standing under hood sounds great, but beside it or in fenderwell it sounds like a main knocking, runs great however no lights on, fresh oil 5/30, does have a manifold leak but its not that u can hear that ticking when on the gas, its definately in the pan, any suggestions?

 

I've been fooled by exhaust leaks before like that and I'm inclined to believe there is a good chance your being fooled by one now. Check it for exhaust leaks. Try looking at the engine in darkness and see if you can see exhaust flash..

 

well it def has e pass side manifold leak, but u cant hear it until u gas on it, this is at idle sounds like a sewing machine, and rev just a lil its gone

 

u know how lifter or phaser ticking tapping sound, well this is like a... locka locka locka locka sound more low mellow tone, not like a tick rocker or lifter sound, what gets me is only @ idle, once reved its clear tone thru muffler, as tack comes back down to idle its back, reminds me of torqu converter lil loose sound,. but already checked that, also just changed oil tonight myself m1 5/20 and m1 filter, no diff, still there, however it did seem quiet when 1st started it from that oil change, seemed like once idled down from cold start i could hear it again

 

Mechanics stethoscope... Pay close attention to the front timing cover area, cat converters, oil pan, exhaust manifold etc....

 

took to garage they used stethascope said he heard it in back of valve cover more than the front but oil pan front trans the most, which is where it sounds to me, sounds like a lifter in the oil pan, lol, but when on the gas its gone, has to be a main

 

u mentioned cat converter? never heard of them making anoise, just get plugged

 

Cats can and do make noises if they are starting to break up inside.

 

2000 rpm up sounds great, just at idle loca loca loca, underneath, open hood sounds fine just hear the fan, its clearly underneath, does have a bad manifold on pass side, but u can hear that when driving it on the gas more of a tick sound, this like a knock in the pan, nothing like these 3v 5.4 u hear, their always a rattling ticking phaser prob, this deep faint knock in pan when idling

 

I had a knock in my old Mach I once that I was sure it was a main bearing. Checked the header bolts just to be sure and that was it. Sounded like it was coming from underneath and all. I still wouldn't be surprised if it was an exhaust issue..

 

im thinking thats what it is too cause pass side does have rear stud broke and truck runs great, heres a link hope it works http://youtu.be/m9AUqooH6uQ

 

It completely goes away when reved above 2k?

I would think a main would get louder with rpms as it has a harder time staying balanced with a flat bearing. If it were a rod bearing or wrist pin, by shutting down that cylinder the sound would/should all but go away. By that, you can do a quick test and unplug each cop one at a time and listen for the sound to go away. Hard to tell in your vid.. Almost sounds like an exhaust leak like jethat has mentioned. They normally are more pronounced when cold clear up a bit when warmed up.

 

yea the ex leak once warm u only hear when gassing on it, the other noise is at idle in the pan or around pan

 

I have this exact sound coming from my 1999 5.4 Expy. After crawling underneath between the cat and the pan it was definitely the cat.