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Hello, does your scan tool monitor any data at all? Like EBP, map, or mgp?
When driving what is the highest the map reading goes up too?
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.
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.
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.
Sounds good. Does this have a programmer installed by chance?
It's possible. If you rev the engine to 3500rpm in
In park what does the EBP read?
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
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.
You building boost when you unplug the map sensor?
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.
Something is incorrect. What voltage reading do you get key on engine off.
When you unplug the map sensor what does the scan tool show for psi?
Correct I'm wondering if the map sensor is defaulting when unplugged to read a high pressure
Unplugged you get 11psi of boost?
That is odd. You shouldn't have boost if that is the case. I would recommend updating the PCM if you had a chance.
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.
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.