Ive got a 2004 f150 super cab with 4.6 liter. Ive done the timing chain and water pump. All is good with that. Now for the past week I get this crazy rattling every once in a while. It doesn't matter if it hot or cold Ive checked for loose wires and things rubbing the fan and checked the heat shields. Does a main bearing rattle all the time or just so often.? How about roller rockers? when do they rattle? Any one have a fuse location chart for the inside fuse box?

 

CATS maybe?

 

ive checked the whole system clamps heat shield everything. What engine part could rattle just sometimes? Like bearings or rod or???? hey im across the parkway in Breathitt ky

 

I'm along the ohio river man. Brethitt is about 2 1/2 hours southeast of me.
Is it possible for you to post a video of the sound? You will have to upload it to youtube then post the link on here

 

Ive done some fishing by the bridge in Maysville, The ohio river has some monsters in it compared to what I have here at home. But if I can catch the sound of video I will post it for everyone. thanks

 

General location of the sound?
Could be exhaust related. Cat, muffler, old pipes

 

front end could a broken manifold stud cause a rattle sound sometimes?

 

Post a video. Kinda sounds like you are talking about a cam follower.

 

couldn't get it on video its so sneeky. Will a cam follower rattle sometimes? how could I make it do it?

 

When does it do it?