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James, Ford Technician
Category: Ford
Satisfied Customers: 3632
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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E450: I have a 1999 e450 7.3 powerstroke was blowing white

Customer Question

I have a 1999 e450 7.3 powerstroke was blowing white smoke and turbo not building pressure turbo spins free and all blades on both sides are good fuel pressure is 70 psi oil level is new and full new fuel filter allno leaks on either side of turbo
Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.
Hello, did you check the exhaust manifolds for leaks? If they are not leaking turbo boost is detected by the map sensor. If the map sensor isn't working correctly you won't build any turbo boost.
Customer: replied 1 year ago.
Boost pressure on scanner mirrors actual guage reading and no codes present
Expert:  James replied 1 year ago.
So it's showing 0psi? With the key on engine off the map sensor should read atmospheric pressure. Does this have an aftermarket boost gauge?
Customer: replied 1 year ago.
No aftermarket guage I used my test set computer say 0 psi with it idlingor reving
Customer: replied 1 year ago.
Map psi is 14 manguageprs is 0
Expert:  James replied 1 year ago.
If that map hose or turbo going to the intake restricted at all?
Customer: replied 1 year ago.
Both are clear
Expert:  James replied 1 year ago.
I'm guessing you checked the air filter as well correct?
Customer: replied 1 year ago.
Yeah took box out
Expert:  James replied 1 year ago.
Do you have a map sensor from a known good vehicle you can try?