Originally Posted by Blue01F250
also -- I've read a LOT of people just have faulty coolant caps and when the system gets pressured up (like under load) it starts spewing thru the cap...
try the simplest first -- replace the cap... if it fixes it - GREAT! if not.. then you start moving on to the more serious things...
Usually they are faulty because of excessive pressure.
I replaced my cap and the tea kettle sound went away for a little bit, but it showed back up. Combustion gasses were making it into the cooling system.
Since the OP stated he has used a Predator, I would venture to say that he has stretched headbolts. Predator programmers have too much timing on the top end and have been the leader in headbolt stretching. If there is no coolant on the ground where I described earlier, that would pretty much rule out a cracked EGR cooler.