06 6.0 175k miles egr delete only.


Going over this truck my dad bought and getting after getting a fuel related issue straight, I am now just going over general health of the truck. Notice the truck seems to take 1-2 cranks too long to start. (compared to all other 6.0's ive worked on including mine)


It starts good, with a slight bit of stiction and no smoke at all.


My IPR/ICP% (i think it reads ICP duty cycle on livewire, ipr % on torque pro) is between 35-40 psi on cold start, and ICP pressure is (I have to double check later) 1300 psi. Both of which seem high for idle, even if cold.
Goes down to 23% and around 600 psi when it gets warmed up.


Havent checked numbers yet WOT due to the fuel issue I was having.


My thought are plugged IPR screen? This truck is stock, with good DELTA's


And can someone explain the numbers for me and how the software reads the information. Is displayed ICP pressure the actual oil pressure the ICP is seeing? Or is it what the computer is requesting? Because I unplugged the ICP and the pressures (numbers on torque pro) still go up and down with throttle. same question with IPR%/ICP duty cycle.

 

I haven't seen any good numbers for cold IPR values. 23% hot would generally be OK from what I recall.

my understanding is the ICP is reporting real pressure. If you unplug it, the computer infers a value off accelerator position. Mine at warm idle was around 875 psig.

I don't see anything that would make me go into it just yet. You may have a slight HPO leak, depending on year there are some usual suspects.

 

Have you done a fresh oil & filter change? If not, being a recently purchased truck don't discount the possibility of incorrect/substandard oil and filters maybe contributing to these numbers. Basic I know, but it's always good to confirm those bases are covered.

 

Yes this is after fresh oil and filters

 

My Ipr is normally in the 30-40% range on a cold start. Once engine oil temp gets to about 140-160 it goes down to about 23%. My hpop only has about 15,000 miles on it.

 

Post ICP and IPR % @KOEO

Warm engine to 185* EOT
Post ICP & IPR% @ idle
And again @2500RPM

​​​​​​​

 

Will do Monday or Tuesday

 

IRP seems to be acting normal upon further review. Runs around 600 psi and 22% when hot. Now I am chasing what seems to be a VGT problem. Vanes are not stuck but boost acts erratic when coming off of a WOT run, and accelerating again right away there seems to be a lot of lag. My VGT% acts erratic (almost like it's "hunting" the right %) and my boost guage will actually drop into reading vacuum. Truck runs great with about 21-24psi boost on WOT runs.

 

Does it throw any codes?
Several things you can check
MAP hose cracked, or the nipple on the intake plugged with gunk
EBP tube plugged

Turbo veins sticking.....you say they are not stuck but have you confirmed they are not sticking? Removal is the only way to tell
You should see a wide swing between idle and WOT, and it likely has the vein sweep on start up programmed, so if you don't hear that it's sticking.

Up pipes might be leaking
Boots might be leaking

VGT solenoid maybe sluggish. OHM it out to confim

 

Yes I had the turbo apart to clean it. Moot point now, the EBP was totally plugged shut at the manifold. Had to use a drill bit to get it cleaned out. Seems to be much better now. Reason I did not check this at first was my EBP sensor seemed to be reading good pressure. (was comp to MAP @ idle, and went up and down with boost) This is impossible, however, since the tube was 100% plugged.

 

You also have to remember that VGT% is a commanded value, not actual since there isn't a position sensor in the VGT solenoid. I'm not saying you don't have a problem, just take that into consideration.

 

Post EBP
EOT @185*

EBP @KOEO
@IDLE
@2500 RPM

In an 06 the PCM uses EBP to calculate/command VGT Position so you need to verify EBP Reading before chasing vgt or any turbo output issue

 

KOEO;

EBP-14.4
MAP-14.4
BARO-14.2
IPR%-14.7
VGT-0

IDLE;

EBP-16.8
MAP 15.2
BARO 14.4
IPR%-22.8
VGT-68.3

2500 RPM;

EBP-28.9
MAP-21.9
BARO 14.4
IPR%-45.6
VGT-53.8

Since I cleaned the EBP tube, it seems much better. I am fighting a stiction issue that goes away around 160 degrees EOT but that is beside the point, how do these numbers look?

 

If it was hothot EOT 185* or more IPR is high
Looks like a HPO leak

IPR% should come in at 40% when hot @2500rpmrpm

Strike 1

 

Extended cranks or multiple cranks to start back the idea up that it leaks

Strike 2 against HPO system

Does it have correct filter and oil filter cap?

EBP looks good

I'll try and post all values for everything tomorrow