So... doing the boost leak test now. Made the cap that ties directly into the boot that feeds the turbo (removed the air duct & the ccv). when I push 20psi into the turbo I still get air out of the ccv hole coming from the cover
I have cranked the motor 3 times and still get a loss of pressure there. The boost system still holds about ~10psi and even if I plug that hole it does not want to keep the 20psi.
Any ideas? What am I doing wrong?

 

I had some air exit the CCV port too. Don't just look at your CAC junctions, check your intake plenums.

https://www.ford-trucks.com/forums/1...ain-video.html

 

Thank you for the reply - I did check the plenums (as good as you can anyway - even used the soap).
Next I will put the ccv back on & put pressure to the entire system like you did & lather it up with soap again to see if I can see any bubbles.
Any other thoughts?

 

Well, I didn't have the CCV in the pressurized system, I wouldn't do that. Also don't put more pressure than you need in the system, could cause issues with the thrust bearing in the turbo. May need to lather up the intercooler too.

Losing that much air, you should be able to "hear" the leak.

 

Then I am confused - I took the boot & black thing in between the air box & the turbo off the first time. Only kept the boot coming off the turbo. I thought that black thing in between the turbo & the filter was the ccv... Isn't that breather coming off the black thing that goes into the valve cover where you found air and "smoke" the first time?
I had my pressure at about 25psi.

 

Ok, too easy... here's the skinny. You have Air filter -> rubber hose -> hard plastic hub, that has a 90 degree rubber hose that connects to the valve cover -> another rubber hose -> turbo.

You need to pressurize the rubber hose that is directly connected to the turbo, and leave the rest disconnected. I did have some pressure coming out of my CCV, but not much. You could also remove the 90 degree elbow, but you'd need to plug the hole in the hose between the filter and the plastic hub prior to pressurizing.

 

ok then I did it correctly. I removed the filter, the first rubber hose & the hard plastic hub then tried to pressurize the system. I could only hold about 10psi because I had quite a bit coming out of the 90* rubber hose coming from the valve cover.
I cranked the motor thinking that maybe it was in a cycle that could cause all the air to go into a cylinder but I still got all of the air coming through.
any thoughts on what my next step should be?

 

So what lead you to do a boost leak test anyway?

 

That is the question, was the engine running or missing bad ?

 

Well the truthful answer is that I was bored & am always looking to tinker while learning more about the truck over and above that I am trying everything to get my fuel mileage up as far as I can get it (am about 15-17mpg now)

 

Nope, it ran fine just did not seem to have the boost or get up and go that it used to.

 

Purely a noob answer, but i wouldnt think you'd lose boost at the ccv connector, since it is on the "suction" side of the turbo. Again, thinking out loud.

 

Pull Driver side VC and pressurize the system and see if you can find a leak. If IIRC some one on here found a GP with a hole in it, kinda the same way.