IVE BEEN TOLD BY DIFFERENT MECHANICS THIS IS PISTON SLAP, Y PIPE FLUTTER, AND TIMING CHAIN PRETENSIONERS. THE V10 HAS 166.000 MILE ON IT AND IS A EARLIER 1999. IT DOES IT ONLY WHEN COLD STARTING IN THE MORNING. IT CAN SIT FOR HALF OF THE DAY THEN CRANK IT UP AND IT MAKES NO NOISE. IT RUNS GREAT AND HAS PLENTY OF POWER. IVE TRIED MOTORCRAFT 5W20 SYNTHETIC BLEND, CONVENTIONAL 10W30, AND MOBIL 1 FULLY SYNTHETIC 5W20 IT HAS NO AFFECT ON THE NOISE. AS YOU CAN SEE IN THE VIDEO IT STOPS AFTER A MINUTE. HERE IS YOUTUBE LINK YouTube - 1999 TRITON V10 F250 COLD START NOISE WHAT IS IT?

 

My opinion's not worth much, but it seems too metallic for flutter...

Do you have an oil filter with an anti-siphon valve?

 

IT HAS A MOTORCRAFT OIL FILTER I WAS TOLD THAT WAS THE BEST ONE TO USE THANKS

 

An exhaust leak maybe?

 

Sounds like oil not getting somewhere on time. Blocked oil passage?
How long you have the truck? maintenance records?

 

Could it possibly be that the exhaust manifold has a leak, and as it warms up and expands, it seals the leak? Sounds awfully loud for a leak that small, but it's worth checking. See if there's any black spots around the exhaust manifold indicating a leak.

If you have a mechanic's stethoscope, it might help nail down where the noise is coming from which would help a whole lot with identifying the noise.

 

Oh, and FYI, ALL CAPS = SHOUTING IN INTERNET LAND. And it's easier to read when it's not all caps.

 

Does not sound like no exhaust leak to me. Got to be piston slap as that is what the early 99 was know for. My rv is a 2000 model with a april of 99 engine in it no sounds when start up cold but only has 24,000 miles on it.

 

I'm gonna say it's piston slap. It has all the symptoms that points to that direction.

 

I've only had it about three months. it came from Utah forest ranger who bought it new. No service records but i worked at a ford dealership a few years back and they usually service their vehicles regularly. Thanks for your help and had no idea about the caps sorry.

 

I don't know if the V10 has hydraulic lifters, but I have a minivan that made that kind of noise. I gave it an oil change with one of those additives where you idle the car for ten minutes while the additive dissolves internal sludge, then replace the oil. Totally took care of the problem over 5 years ago.

 

I don't know what it is but mine does the exact same thing. It is definitely not exaust it is inturnal. But like yours it always goes away in a minute or less and never does it on a warm start.

 

There's a minute space between the cylinder and piston causing the piston to slightly "wobble". After a minute or two, the piston heats up, expands and fill in that space and no more piston slap. I think this is what's happening.

 

A few things to check.

Take a piece of hose, about 2-3 feet long, put one end near your ear, and hunt around for the noise with the other. Start at the back of the valve covers, and work your way forward, and then check the timing cover, and finally, the sides of the block, and the pan.

That does NOT sound like piston slap.

It definitely sounds valve-train related, and definitely sounds like single or maybe multiple lash-adjusters (lifters) not pumping up.

That's definitely a '99 with a 2005-2007 nose?

 

Yes its a 99 i did the conversion about a month ago it had the black bumper, grill, and headlight buckets so i changed everything over to the 05-07 thanks for the info