faulty gauge, possibly poorly calibrated??? Try another gauge???

 

I have checked for exhaust leaks and have not found any but will do so again. Will also spray boots with soapy water as well. I went over all that stuff multiple times but you never know.

I do not think it is the scan gauge as you can feel the power come corresponding with the boost numbers. I do not recall the boost code I used but I have changed to a different one in the last couple of days due to someone suggestion on here. No change.

I may pull the cat tonight and see if it is clogged, long shot but but at this point the only thing after that is possibly a problem with the turbo.

 

instead of pullen cat just undo the downpoipe clamp at back turbo and let it vent

usualy truck runs bad with exhaust plugage

does your boost gauge read 0 at KOEO

 

It does read 0 KOEO. I am out of ideas at this point.

You said the 03 uses the MAF as well could there be a problem there? I would think if it was the problem it would certainly throw a code.

 

You need a long open road preferably a hill. I know mine doesn't often go over 20 unless pulling a hill and it hits 4th or 5th pulling hard. I don't think it will let you get more then twenty if your temps are not up either. All these other things, check that kitty and maybe get a new air filter, gauge can go bad occasionally too.

Also, what do you get pulling a load, in 3rd, 4th and 5th?

Boot to the boards and keep it there.....

 

Pulled the cat and it was good. Maybe my truck is just on the low side of the boost spectrum like yours is. Reading this board has me always looking for any issues.

The most I have seen is 20 lb and that was up a slight hill. I am in Houston tx so there are no hills. Next time I go fishing at one of my spots I will hammer it on a steep bridged going over the intercostal pulling the boat and see what I get.

 

Here's why I asked about your fuel pressure. Mine went from 21 to 25 and I have since gotten to 26 after the blue spring was installed. It could be that the blue spring did improve your fuel psi situation by some amount, but maybe that doesn't mean you aren't still starving for fuel when you call for it under load. If you have ruled out all other stuff, might be the last thing to consider.

https://www.ford-trucks.com/forums/1...ved-boost.html

 

I guess I will get a gauge and check that as well. Can't hurt anything and gives a good excuse to buy a new toy.

Never have checked fuel pressure on this truck, I just put the blue spring in when I got the truck as everyone says it is a must do.

Does anyone know if when ford was de tuning the 6.0 with updated PCM strategies were they doing that by turning the boost down? Maybe I just have one of the more undesirable ones.

 

TURBO VGT DIAGNOSTIC
http://www.forddoctorsdts.com/techni...sorBooklet.pdf
TURBOCHARGER GUIDE 6.0L
https://www.ford-trucks.com/ford-man...er%20Guide.pdf

MAF Voltage (volts)
TXD: 07E0221177
RXF: 046245110677
RXD: 3010
MTH: 000100250000
NAM: MFV

POST MAFV Same as Before sounds like you did it right but to be shure like this below

OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to And EOT at 185* or higher
A/C OFF
----------------------------------------------------------------------------------
#1-------KOEO=Key On Engine Off =record EACH sensor value and POST IT!!
#2-------Low Idel (truck idel on its own)=record EACH sensor value and POST IT!!
#3-------High Idel (2500RPM)=record EACH sensor value and POST IT!!
ALL^^^^^^^^^^^^^^^^^^^^^^^^^ Taken in Park or Nuetral

is this the Boost Code you are using
BST 07E0221440 046285140640 3010 01220320**** Boost (PSI). In order to get the proper boost value enter the MAP XGauge. Get a reading

from it with the key in the on position but the engine off. Based on the reading change

the last 4 digits of the MTH value that corresponds to your reading in the table to the

right.

14.7 ‐‐ FF6D

 

just installed boost guage in mine today.. hit 28lbs, not loaded, just gave it a good boot from a light..

2004 f350

 

I have he MAF code all entered in but have company this weekend so I can't get the truck out. Will have to run it Sunday and see what we have.

 

Here are the values.

MFV

.05 KOEO
1.57 LI
2.88 HI


That is the boost code I have entered.

 

I could not find the range but it looks like the mass air is working, correct?

 

MAF 0 1.44 2.65 0.5 - 4.75 VOLT Mass Air Flow

Looks Good

All your sensor are coming back OK

So that leaves
Turbo
VGT
Leak


try this

VGT SILINOID TROUBLESHOOT
There definitely should be a noticeable difference when the VGT actuator is plugged in or not. If you have access to
a wiring pigtail, (exactly identical to that of a 7.3L injector or IPR connector), you can test this out yourself, by
holding it up to 1200 RPMs in PARK or NEUTRAL and supplying your own power and ground directly to the
actuator via a pigtail connector. When you do this, you should hear the turbo spool up almost immediately, and
stop when you remove the power and ground supply. If it does not, the VGT actuator is bad. By doing this, you
elimate the need to get your hands on a scan tool to take active command of the actuator.

 

I will test all of that next. Thanks for all your help.

I am going to get someone to it there foot over the exhaust pipe when it is running foar a second and see if I can hear or see any leaks. The y pipe and down pipe are all are wrapped with insulation (guessing because it is a King Ranch) so that could be hiding a leak from easily being found untill the pressure gets up.