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James, Ford Technician
Category: Ford
Satisfied Customers: 3628
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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We have a 2008 E-450 6.0 liter diesel engine which looses

Customer Question

We have a 2008 E-450 6.0 liter diesel engine which looses power sporadically. It does flash codes ranging from low to high voltage and ignition key in circuit fault, general 2 control circuit etc. This is on an ambulance. No one can pinpoint the problem. The truck has been in the shop twice for turbo repairs.
Submitted: 10 months ago.
Category: Ford
Expert:  James replied 10 months ago.

Hello, when you say you lose power is it electrical power or engine power?

Customer: replied 10 months ago.
Engine power
Expert:  James replied 10 months ago.

Does the engine run rough when you lose power or just have no boost?

Customer: replied 10 months ago.
No boost
Expert:  James replied 10 months ago.

I would first check the map sensor nipple going into the intake manifold. If it is plugged with carbon you will lose boost. Also if the EBP sensor tube is restricted you will lose boost. These are the two items I would suspect for not setting any boost code.