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James
James, Ford Technician
Category: Ford
Satisfied Customers: 3625
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: 1 year ago.
Category: Ford
Customer: replied 1 year ago.
What info do you need ?
Customer: replied 1 year ago.
I have a scangauge on the truck now
Starts and runs fine other then no power
Expert:  James replied 1 year ago.

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

Customer: replied 1 year ago.
i have ficm voltage,ficm sych,ipr duty,icp,ebp and map on it now
Customer: replied 1 year ago.
What info would you like
Expert:  James replied 1 year ago.

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

Customer: replied 1 year ago.
14 psi range just atmospheric pressure
Customer: replied 1 year ago.
The map really doesn't go up or down from idle to wot
Expert:  James replied 1 year 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 1 year ago.
Already did both no change
Expert:  James replied 1 year 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 1 year 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 1 year 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 1 year ago.
tried that too
I've even unhooked the batts a second time over night and let it idle
Customer: replied 1 year ago.
I'm going to check some of my other ideas today
Expert:  James replied 1 year ago.

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

Customer: replied 1 year ago.
Nope never needed or wanted one
Customer: replied 1 year ago.
Could it be the PCM ?
Expert:  James replied 1 year ago.

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

Expert:  James replied 1 year ago.

In park what does the EBP read?

Customer: replied 1 year ago.
Nothing reads blank
Expert:  James replied 1 year 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 1 year ago.
Nothing
Any time
Expert:  James replied 1 year 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 1 year ago.
The connection are showing voltage and a signal
And I've tried two sensors no change
Customer: replied 1 year ago.
Now why would it make boost with the map unhooked ?
Expert:  James replied 1 year ago.

You building boost when you unplug the map sensor?

Customer: replied 1 year ago.
Expert:  James replied 1 year 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 1 year ago.
I've tried two maps
One ford and a off brand
Same thing
Expert:  James replied 1 year ago.

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

Customer: replied 1 year ago.
Voltage on the map ?4.96 volts
Expert:  James replied 1 year ago.

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

Customer: replied 1 year 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 1 year ago.

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

Customer: replied 1 year ago.
2.8 map minus 11.8 boost
Expert:  James replied 1 year ago.

Unplugged you get 11psi of boost?

Customer: replied 1 year ago.
Negative 11psi so vacuum
Expert:  James replied 1 year 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 1 year ago.
A reflash?
How would i know if its been done ?
Expert:  James replied 1 year 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 1 year ago.
I dont see how a reflash would help a no boost problem
Expert:  James replied 1 year 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.