Originally Posted by blpcjpblp
Got back to the garage and check for the obvious and saw nothing wrong. Pulled the inlet hose off at turbo...spins smoothly by hand..no play in shaft...removed the EGR..a little sooty...not clogged...opens and closes smoothly by hand..put all back together...test drive....fine stop to stop...merge on highway, about got my a@@ ran over again....paid attention to gauge....maybe 5lbs of boost even at near WOT...no black smoke...back off of highway...seems fine from stop to stop....exhaust smeels a little "different"...maybe...ANY SUGGESTIONS
A few other things that can contribute to low/no boost that you could check:
The ebp sensor and tube.
On your 05, the sensor is located on the drivers side, attached to the FICM bracket. Use two wrenches (one on the sensor, one on the tube) and remove the sensor. Take a long piece of tiewire or something similar and poke all the way down the tube to the exhaust manifold. There is nothing in there that you could possibly hurt, you want to make sure that the tube is not clogged with soot. Wipe the soot off the sensor and reinstall.
The MAP sensor hose and nipple.
The MAP sensor is located on the passenger side of the engine bay, on top of the heater box, attached to a triangular shaped bracket. Check the black rubber hose that goes from the sensor down to the intake manifold for any cracking, pinholes or chafing. Using an allen wrench close to the same diameter of the hole in the brass nipple the hose connects to on the intake manifold, poke the nipple to ensure that it is not clogged with soot.
If these do not help the situation, the fact that the truck sits long periods of time without being used points to the turbo sticking due to rust build up. The rust formation on the surface that the unison ring slides on prevents the VGT solenoid from opening/closing the vanes fully. You will have to remove the turbo and clean it.
To do so, I have included a link to a turbo removal/install pdf file. You will also need to purchase a turbo hardware kit, and a turbo cleaning kit.
Turbo removal/install CLICK HERE
Turbo cleaning directions CLICK HERE
Turbo cleaning kit, $57.20 CLICK HERE
Turbo mounting hardware kit, $7.70 CLICK HERE
Suggested upgraded parts to consider changing to ensure better oil delivery and draining for the turbo:
Updated turbo oil supply line, $77.00 CLICK HERE
Updated turbo oil drain tube, $21.45 CLICK HERE