It's odd. It'll only do this faint knock after it's started warming up, and goes away when fully warmed up. It does NOT do it cold, and NOT hot.

Ideas? I just bought this truck like a month ago. It was probably making the sound before, I just couldn't hear it. The thing drives fantastic.

http://www.youtube.com/watch?v=iN4T5...ature=youtu.be

 

Bump

 

this could be normal and could be any of a few things. is this a loud knock or more of a ticking noise?

 

I watched you're vid and that sound is not normal i have the same truck same year and same engine.mine does not make that sound.hard to say over the internet what it is could be the fan could be the belt sounds like something like that to me.is your truck a 4x4?you dont give much info on it how many miles on the truck?

 

Sorry guys. Listening to the video, it's clearly a knock. Truck is 2wd, 149,000 miles.

It purs like a kitten when it's good and hot. K&N oil filter, 10-w30 Castrol GTX High Mileage oil

Thanks for the replies, guys.

 

It's also very faint. If the HVAC is on low you can't hear it, and it's not audible outside the cab.

 

it could be something loose under the cab that is knocking because of a broken weld or some ****

 

Did ya hear the video? I don't think it's a rod knock because 1.) It goes away, and two.) It's too damn quiet :P . Does the 4.7 have lifters? I don't know what the oil change history is on this truck.

 

I swear it sounds like piston slap to me. Which would be mostly harmless. A rod would only get louder when it warmed up.

 

only way you will ever find out is to take it to a mechanic.I would just ask them to take a listen to see what they think it is.im sure they wont charge you.