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Low Boost Issue Involves MAF sensor

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Old May 27, 2026 | 01:33 PM
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Low Boost Issue Involves MAF sensor
I have a 2004 early model 6.0 PowerStroke with the 2003 engine in it. It has the Icp by the turbo. I am having an issue where I will only make 10 lbs of boost unless I unplug my MAF sensor. My Map sensor is reading correctly. I can't remember what my EPB sensor reads; however, it is new, and the line has been cleaned out.
When I unplug my MAF sensor, it seems to go to default values and makes 25 lbs of boost. The truck has a new turbo and all-new boots.
My question is, does unplugging the MAF sensor default the ECU strategy not to monitor any values? If so, what tests can I do to see what is going on and why it is that when I unplug the MAF sensor, the truck runs as it should?
Also, the MAF sensor is brand new, and it has the same readings as the previous sensor.
 
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Old May 27, 2026 | 02:46 PM
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Do you have the "Inferred EBP" flash?

Do you have a PID labeled "EBPInf" or EBP-Inf"?

Where did you get the new MAF sensor?
 
Last edited by bismic; May 28, 2026 at 04:37 AM.
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Old May 27, 2026 | 03:42 PM
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Originally Posted by bismic
Do you have the "Inferred EBP" flash?

Do you have a OID labeled "EBPInf" or EBP-Inf"?
yes I do here are my values at idle. And I was wrong my boost with it plugged in shows 17 psi full throttle.


 
Last edited by Eliasd; May 27, 2026 at 03:48 PM.
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Old May 27, 2026 | 03:58 PM
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With the "Inferred EBP flash" (used only in the '03 engines), the PCM relies on the MAF and MAP.

Make sure you thoroughly inspect your MAP sensor hose for leaks and tears and loose fit.
 
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Old May 27, 2026 | 04:41 PM
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Originally Posted by bismic
With the "Inferred EBP flash" (used only in the '03 engines), the PCM relies on the MAF and MAP.

Make sure you thoroughly inspect your MAP sensor hose for leaks and tears and loose fit.
thanks it has a brand new hose on it. The clamps are tight but old so maybe… I will try putting on a new clamp to see if it’s leaking out the side under load.
 
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Old May 27, 2026 | 08:14 PM
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It has to relearn when they are inferred... Clear all codes.. Let it idle. There is a pid for "ok to learn VGT" and a pid for "VGT inferred learned" . It will idle up and down for a little while. If there are no issues with the map, mass air, or VGT then it will learn and give you boost again.... Ah, the good old days, back when International was trying all kind of stuff to 'fix' things on the 6.0l
 
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Old May 28, 2026 | 06:20 AM
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Could the inter cooler leak

does MAP =BARO @KOEO

is there any codes
 
Last edited by BLADE35; May 28, 2026 at 06:22 AM.
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Old May 28, 2026 | 09:47 PM
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Originally Posted by BLADE35
Could the inter cooler leak

does MAP =BARO @KOEO

is there any codes
yes map = baro and I don’t think so because when the maf sensor is unplugged it holds up to 25 lbs of boost no problem.
 
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Old May 28, 2026 | 09:49 PM
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Originally Posted by LEEDSnDeed
It has to relearn when they are inferred... Clear all codes.. Let it idle. There is a pid for "ok to learn VGT" and a pid for "VGT inferred learned" . It will idle up and down for a little while. If there are no issues with the map, mass air, or VGT then it will learn and give you boost again.... Ah, the good old days, back when International was trying all kind of stuff to 'fix' things on the 6.0l
Originally Posted by bismic
With the "Inferred EBP flash" (used only in the '03 engines), the PCM relies on the MAF and MAP.

Make sure you thoroughly inspect your MAP sensor hose for leaks and tears and loose fit.
Hose clamps are new and tight still doing the same thing. The sensor also reads correctly with the key on engine off when it comes to atmospheric pressure.
 
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Old May 28, 2026 | 09:50 PM
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Originally Posted by Eliasd
Hose clamps are new and tight still doing the same thing. The sensor also reads correctly with the key on engine off when it comes to atmospheric pressure.
The pid for the relearn says that it has learned and it has lower and upper values proving it
 
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Old May 28, 2026 | 11:06 PM
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Can you post value for
MAFV


KOEO
IDLE
2500rpm
sensor value for each of these

was the MAF. A new sensor ? Let’s see if it meets spec

Also what you get for VREF

 
Last edited by BLADE35; May 29, 2026 at 07:39 AM.
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Old May 29, 2026 | 09:17 AM
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Operating values
 
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Old May 30, 2026 | 10:04 AM
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Have you cleared out the nipple on the intake manifold where the MAP hose attaches?
 
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