Noisy engine when cold

You have a faulty temperature sending unit/sensor. The engine is flooding after warmed up because the sensor is not telling the computer to take it out of "cold start" mode.

I'm not sure if the engine has a cam chain or belt but if chain it might be the tensioner.

you have to observe oil pressure of an engine oil when it is cold ..it might be lack of oil pressure when the the engine is cold

the hydraulics will leak down after the engine has been stopped for a while . The noise on start up will be until the oil again fills the lifters. If it is getting really cold (under 32F of close to 0 c) then you may have to consider a lighter viscosity grade of engine oil (10w-20 or 15w -30) the manual will have the recommended viscosity of oil for cold areas or you can check with the oil catalogue at any auto parts store.

runs hot,ok, restarts hot ok
just dont start , cold, but it must because how do you get to 2hours?
from hot?
my guess, is it sometimes does start cold.
ever tune it up at the critical 60k mile service, ever, this decade?
that covers 99% bad cold starts. so , we do that first.
diagnosis is like 10x a tune up, so........ $$$$$

Dry

I have the same problem with my F150 4.6. Long cranking when out door tempurature is hot. Engine temp gauge indicates normal engine tempurature. Looking for solution.

possibly faulty...worn,get checked out, not really old enough to be noisy..oil not too thin or low,temp not too hot,either weather or engine temp too high(hot),engine hasnt got hot in the past,does it get plenty of revs ??? all could be causes maybe replace them ,not worn camshaft ..engine runs O.K?

Might be an oil issue. Oil when hot might be too thick for the pump to pump the oil easily in the engine. Check that and if not that come back.