Tips For Ford Diesel Misfire

Aug. 16, 2022

Ford F-Super Duty vehicles with diesel engines are experiencing some run-rough and misfire concerns. Here are eight tips on how to help fix the problem. 

Some 2011-2012 Ford F-Super Duty vehicles equipped with a 6.7L diesel engine built on or before 2-12-12 may exhibit a run-rough and/or misfire concern with or without DTCs P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308.

  1. Inspect all eight fuel injector hold-down clamps for a broken ear.

  2. If any broken ears are found, replace the clamps(s), re-seal the affected injector(s) and replace the injector-to-valve cover seal.

  3. Pry the injector-to-valve cover seal out of the valve cover using a screw driver. The new seal can be installed using a 22mm socket (rolling/pressing the seal in place).

  4. Inspect the fuel injector return hose connection at the injector(s) for damage and replace if needed at this time.

PART                         P/N

Injector hold-down clamp………BC3Z-9C334-B

Injector seal kit (1, 2, 7, 8)……...BC3Z-9229-A

Injector seal kit (3, 4, 5, 6)……...BC3Z-9229-B

Injector return hose……………..BC3Z-9A564-B

Injector-to-valve cover seal…….BC3Z-6C535-A

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