Truck has no low end torque and accelerates very slowly off the line. Can not maintain speed going up hills.
Jeep has weeks kit + a yeti tune. Silicon turbo hoses.
Is this a complete list of what can cause this code and symptoms?
#1 malfunctioning vacuum/turbo control system.
#2 leak in the charged air system.
#3 faulty map sensor or wiring.
#4 malfunctioning fuel pressure control system.
#5 air in the fuel due to leak in fuel line/fuel filter head.
#6 clogged cat
#7 leak in exhaust manifold between head and turbo.
#8 bad turbo
I have done a bunch already to narrow down what is causing this.
#1
I bypassed the vacuum solenoid. this didn't make any difference. Turbo did spool down while I had the hose disconnected.
I measured vacuum at the tank next to the power steering fluid. It measured 22 inches of mercury. I measured it after the vacuum modulator and it was around 20in/hg. What should this number be?
I also confirmed that the arm on the turbo moves freely and can make it to it's stop. I will do this again from under the jeep while it is idling and see if the arm is reaching it's stop. I will be ordering silicon vacuum line from the whole truck just because I want to make this one rock solid reliable. I plan on using the picture from this thread as a guild.
viewtopic.php?f=5&t=92192&p=949852&hilit=Vacuum+modulator&sid=fc016d5833da55f5ffb4b516b1f85cae#p949852#2
I built a pressure test fitting and used my air compressor to test the charge air system. It held up to 30psi. I could test higher but I don't trust the pressure regulator on my air compressor. During this testing I did find a few faulty or about to fail hose clamps. The PO had used an ebay weeks style kit and the hose clamps and J pipe are junk and wouldn't seal. They have been replaced with clamps off my parts jeep and a real weeks J pipe. I can squeeze the hose coming out of the turbo at idle but when run up to 3000RPM I can not squeeze it.
#3
PO had installed a new MAP sensor. It worked and torque was reporting reasonable numbers. The sensor was a weird part number and color.
0281006076 It crosses to the chevy colorado with the 2.8 CRD duramax. I swapped another normal 0281002845 back in. I have not herd of anyone using this sensor. just the sensor from the chevy cruz.
#4
torque reports fuel rail pressure. getting around 5Kpsi at idle and up to and above 20kpsi while driving. I think the sensor and regulators are working properly. are there any tell tail signs that air is in the fuel system?
#5
The fuel head didn't seem to hold prime at all. I could pump it up and let all the air out of it and come back an hour later and it would have air in it again.
I replaced the hose from the head to the cp3 with new hose and replaced the head with one off my parts jeep with a new filter. the parts jeep has been sitting for a few years and still had fuel pulled up the supply line. How long will it take for air to get out of the fuel rail if this is the problem? Is there a faster why to get the air out if it has any? I may try and find a while to temporarily supply fuel with a pump to see if this fixes the problem.
#6
I pulled the down pipe off and still have the problem. So the cat is probably fine.
#7
This one maybe hard to find. i don't see any soot anywhere and don't hear anything strange. I may get a mechanics stethoscope and trying to hear whats going on. I am also going to check on that VNT vane arm while it is running from under the truck maybe I will see something.
#8
I took pictures of the turbo turbine and compressor sides. I don't see any housing contact. The thing spins very easy and seems pretty tight in and out and side to side.
Am I missing anything?