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James
James, Ford Technician
Category: Ford
Satisfied Customers: 3602
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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My 03 6.0 psd wont build boost after a hpop replacement, Ive

Customer Question

My 03 6.0 psd wont build boost after a hpop replacement
JA: Thanks. Can you give me any more details about your issue?
Customer: Ive Cleaned the turbo'new Ipr,icp,map and still no bboost/ power
JA: OK got it. Last thing — Ford Mechanics generally expect a deposit of about $28 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 11 months ago.
Category: Ford
Customer: replied 11 months ago.
What info do you need ?
Customer: replied 11 months ago.
I have a scangauge on the truck now
Starts and runs fine other then no power
Expert:  James replied 11 months ago.

Hello, does your scan tool monitor any data at all? Like EBP, map, or mgp?

Customer: replied 11 months ago.
i have ficm voltage,ficm sych,ipr duty,icp,ebp and map on it now
Customer: replied 11 months ago.
What info would you like
Expert:  James replied 11 months ago.

When driving what is the highest the map reading goes up too?

Customer: replied 11 months ago.
14 psi range just atmospheric pressure
Customer: replied 11 months ago.
The map really doesn't go up or down from idle to wot
Expert:  James replied 11 months ago.

I would remove the map sensor hose going to the intake manifold. Look to see if it is plugged up with carbon. I would also double check the CAC tube connections to make sure they are secure and not leaking.

Customer: replied 11 months ago.
Already did both no change
Expert:  James replied 11 months ago.

does your scan tool show VGT learn? If the MAP isn't building past 14PSI there is a large air leak somewhere. do you have another map sensor you can try incase it has failed for some reason.

Customer: replied 11 months ago.
Ive replaced the intake gaskets,map and the vgt on the turboThe truck will make boost if the map is unhooked
Expert:  James replied 11 months ago.

When the work was done was the battery disconnected. The reason I ask is the 03 has a turbo relearn procedure. It usually lets the vehicle sit outside and idle for about an hour.

Customer: replied 11 months ago.
tried that too
I've even unhooked the batts a second time over night and let it idle
Customer: replied 11 months ago.
I'm going to check some of my other ideas today
Expert:  James replied 11 months ago.

Sounds good. Does this have a programmer installed by chance?

Customer: replied 11 months ago.
Nope never needed or wanted one
Customer: replied 11 months ago.
Could it be the PCM ?
Expert:  James replied 11 months ago.

It's possible. If you rev the engine to 3500rpm in

Expert:  James replied 11 months ago.

In park what does the EBP read?

Customer: replied 11 months ago.
Nothing reads blank
Expert:  James replied 11 months ago.

That can be the reason you aren't building boost. Does it read anything with key on engine off. With should be within 1psi of the map psi

Customer: replied 11 months ago.
Nothing
Any time
Expert:  James replied 11 months ago.

If the EBP isn't working that explains why you don't have any boost. I would double check the sensor connections and replace if needed to repair the concern.

Customer: replied 11 months ago.
The connection are showing voltage and a signal
And I've tried two sensors no change
Customer: replied 11 months ago.
Now why would it make boost with the map unhooked ?
Expert:  James replied 11 months ago.

You building boost when you unplug the map sensor?

Customer: replied 11 months ago.
Expert:  James replied 11 months ago.

if your getting a reading with a meter then the scan tool can't see it for some reason. If unplugging the map sensor builds boost it can be a defective map sensor. If these parts weren't replaced with motorcraft parts it makes a difference as well. Off brand parts have high failure rates on powerstrokes.

Customer: replied 11 months ago.
I've tried two maps
One ford and a off brand
Same thing
Expert:  James replied 11 months ago.

Something is incorrect. What voltage reading do you get key on engine off.

Customer: replied 11 months ago.
Voltage on the map ?4.96 volts
Expert:  James replied 11 months ago.

When you unplug the map sensor what does the scan tool show for psi?

Customer: replied 11 months ago.
I haven't checked that since i got my scanner to read right
For boost never goes more then a psi or so
Expert:  James replied 11 months ago.

Correct I'm wondering if the map sensor is defaulting when unplugged to read a high pressure

Customer: replied 11 months ago.
2.8 map minus 11.8 boost
Expert:  James replied 11 months ago.

Unplugged you get 11psi of boost?

Customer: replied 11 months ago.
Negative 11psi so vacuum
Expert:  James replied 11 months ago.

That is odd. You shouldn't have boost if that is the case. I would recommend updating the PCM if you had a chance.

Customer: replied 11 months ago.
A reflash?
How would i know if its been done ?
Expert:  James replied 11 months ago.

There have been so many updates over the years. If it hasn't been to a dealership in the last year. Most likely it hasn't been done. If you have a scan tool that could pull the PCM part number it could tell you as well.

Customer: replied 11 months ago.
I dont see how a reflash would help a no boost problem
Expert:  James replied 11 months ago.

Ok.. Well this isn't something I am able to repair without physically being there. I will opt out and maybe someone else has an idea.