I have suspected my truck of a boost leak due to its very excessive black smoke pouring out the back everytime I have my foot on the throttle. Today I took and put a cap where it goes into the airhorn and a cap with an air chuck on the turbo inlet. When I put air in it, it would leak out just as fast as I put it in. I sprayed everything with soapy water and found the wastegate under the turbo was the culprit. If I put in even 1 psi, it would leak out of that small canister. So I put a pair of visegrips on the wastegate line and after that the system held the 14 psi I put in it. I drove it with the line pinched and it didn't seem to make a difference. I have gauges in the mail supposed to be here this next week to see what boost I am making. After I let off the throttle under load I always hear what sounds like a fan over the turbo whine but do not hear this while sitting still and revving it. I am drilling and tapping for a fuel pressure tester tomorrow to make sure my fuel pressure is in check. This truck will not even chirp the tires from a stop in 1st and seems to be lacking power all around....Do I need to replace that wastegate? Is it supposed to leak like that even at low psi? I don't know even how much psi I am pulling until I get the gauges in next week.

 

Something else I think might be relavent is that when I start the truck even at 50 to 60 degrees in the mornings, it idles very low at the first tick mark on the tach. I let it warm up until it gets up to the second, normal idle mark before I take off and put a load on it. I understand it will be a little low but should it idle at roughly half of what its supposed to when it gets a little cool at night? It will idle halfway in between these marks when I start it up on a warmer day, 70 + degrees, until the engine temp comes up.

 

The diaphragm in your wastegate actuator is shot.
Sort of unusual for them to fail, only times I've seen it is when someone tests the actuator with 100 psi compressed air. They can't take much more than 50 psi.
No need to replace it.
As long as your boost doesn't exceed 35 psi just leave the line pinched off.
A 1/4" bolt with a hose clamp works good. Blocking off the wastegate is a very common modification.

Check your idle 12 Valve Idle Adjustment

 

I was running through a pressure regulator even to make sure I filled it up slow, so I don't know what gives. The wierd thing is that even when it is capped or plugged, I don't notice any difference and it smokes just as much with it hooked up leaking. Once it hits operating temp, it idles perfect so I don't think I need to adjust the idle at all do I? I was thinking I might have another problem for it to idle so low until it warms up.