Vehicle: 2004 Ford F-450, 2WD,
Super Duty, V8-6.0L Turbo Diesel, VIN P, Automatic
Problem: The vehicle came in with the
malfunction indicator light (MIL) on and the customer complained
that the engine lacked power.
Details: First, the tech test-drove the vehicle
and confirmed that the engine noticeably lacked power. Next, he
connected the scan tool and pulled the diagnostic trouble codes
(DTCs) listed below. The DTCs were in line with the lack of power
issue. There was a misfire on bank 1. Further testing revealed a
lack of fuel pressure on bank 1 as well.
P0263 – Cylinder Number 1 Contribution/Balance
P0299 – Turbo/Super Charger Under Boost
The tech decided to replace the horizontal fuel conditioning
module (HFCM) due to excessive sediment. This truck’s
low-pressure fuel system uses a HFCM to pump fuel from the tank,
though a filter then to the high-pressure fuel pump. The normal
operating pressure is between 3-8 psi.
After the repair the engine started running much better, but
there was still an intermittent misfire on bank 1. The
Tech-Assist consultant advised the tech that low fuel pressure
can cause the fuel injectors to fail.
Confirmed Repair: With the low fuel
pressure issue in mind, he decided to replace all the fuel
Injectors on bank 1 (1, 3, 5, 7). After the replacing the
injectors, he cleared all the codes and test-drove the truck. The
engine no longer lacked power, the MIL stayed off and the DTCs
did not return.
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