Hey guys I got a 02 1500 with the 4.7, my problem is the truck has been making a knocking/taping sound for bout 2 months now but only on cold starts for bout 30 secs to a min. Within the last week it now also is letting a puff of white smoke out on startup. All the shops around want to hear the noise but since they can't(im 26 miles from town) they tell me its fine n don't worry till it gets worse when they can hear it. I no something is wrong n the last time this happened n I waited I ended up replacing the motor I don't want that again. Also the motor has bout 160xxx on it

 

Is it a knocking or a sort of rattle? The valvetrain on the 4.7L are notorious for clatter due to the lash adjusters being filled with deposits from dirty oil and causing them to stick or not function properly. The lash adjusters put tension on the rocker arm. Once they become dirty, they don't apply the amount of tension needed to the rocker arm which in turn, allows the rocker arm to move around which causes the clatter.

 

That ^ would explain the white smoke on cold start ups as well. Could be more to it, but you won't know until you can get it to the shop or have time to take off the valve covers and do some digging.

 

No its a loud tapping sound like metal on metal but as I said it only last for a few seconds then dies off soon after the engine has come to a idle, once it quotes down u can't hear it in the engine bay but u can faintly hear it from inside the cab when the windows r down

 

Does it sound like this?

 

Sounds like a blown head gasket.
The knocking while cold is common on the 4.7 and could be a number of different issues or combination of different issues in the top end.
Check your coolant level. Monitor it for a while and see what happens. If you get a check engine light with any of the misfire codes it pretty much confirms a head gasket issue.

 

White smoke on start-up only would indicate worn valve guides or bad valve seals.

 

Prismatic when the camera was on the dash that's wat it sounds like, I can take a video in the morning n post it so everyone can hear it, I do have a check engine light but not sure wat it is came on a few days ago but will get it scanned tomorrow n update when I get home from work

 

Also there is no water in my oil

 

You wont always have coolant in the oil with a bad head gasket.