Replaced everything still only 8-10 psi boost

[muddy650]

I got a buddies truck I cant get figured out. It is a 2006 f250 with 6.0!

He bought it and it needed an FICM right off the bat! We replaced that and it runs great up till about 8 lb of boost. Then if you nail on it will actually start blowing black smoke and loosing boost. If you drive it like grandma it does great till it needs more than 8-10 lbs and then it is like you hit a rev limiter and it just stays where its at. RPM's will go up and down as you nail it, but the boost never kicks in. Need some help!!!!!!!!

Replaced Items:
MAP Sensor
MAP Sensor hose
EBP Sensor and cleaned tube
MAF Sensor
MAF Sensor to Intake hose
VGT Solenoid
Took turbo apart and cleaned it up good
Took batteries loose and let the computer reset
Replaced boots with good ones off my truck.
No Exhaust leaks. We have checked 20 times. Everywhere.

Been messing with it all day. And still cant get it to do anything. We may end up taking the turbo off of another truck and swapping into this on, but man that is alot of work for it to be something else.

PLEASE HELP!

[colonel angus]

If there isn't any soot on the firewall, I.E. up pipe leak then only thing left is something wrong with the Turbo.

Save yourself a lot of trouble and leave the back 3rd bolt out.

D

[muddy650]

Yeah we have checked every joint on this thing 20 times! No leaks at all! Just hits 8-10 and motor wise it runs good after that, just with not alot of boost!

[Snake]

Is it tuned or stock?

[muddy650]

Stock truck

[colonel angus]

What are you using to measure Boost?

Stock gauge? ScanGaugeII or controller.

If you say it runs Ok after that then something with how you're reading boost is awry cause no truck runs Ok on just 8-10 PSI boost.

D

[muddy650]

Using stock gauge and Snap-On scanner!

Runs great until it hits 8-10 psi! But when it hits it, noe more boost all motor! will run up to 3500 RPM's, just alot weaker on power since there is no more boost!

I guess I am trying to say motor runs great, but no boost!

[snopro_03]

Did you check the cold side plastic charge pipe, might be a crack your not seeing and it's seperating under pressure.

[muddy650]

Originally Posted by snopro_03

Did you check the cold side plastic charge pipe, might be a crack your not seeing and it's seperating under pressure.

I thought the same thing , after using the search function! Pulled it off and it looks good! Checked it out good!

[Evil Eye]

It sounds like a worn unison ring in the turbo. What did the hole look like? Was it an elliptical shape or was it wallered out?


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