01
Radiator failure
Coolant loss and overheating as the plastic-tank radiator cracks and weeps.
The fixReplace with an upgraded all-metal or reinforced radiator.
2008 – 2010
6.4L Power Stroke: Top 10 Problems & Fixes
The compound-turbo 6.4L makes serious power but runs hot on fuel and emissions hardware. Address the cooling and DPF issues and it becomes a strong, torque-rich performer.
The 10 most common failures
What goes wrong on the 6.4L Power Stroke — and how we fix it
Ranked from the problems we see most. Every one has a real, root-cause fix — not a band-aid.
02
Clogged DPF & failed regens
Constant regens, poor economy, and limp mode as the diesel particulate filter loads up.
The fixEGR/DPF delete with proper tuning for off-road use, or a clean/regen service.
03
Fuel dilution in the oil
Rising oil level and a fuel smell from post-injection regen washing the cylinders.
The fixTune out aggressive regen and shorten oil-change intervals.
04
Cracked pistons
Loss of power, smoke, and blow-by — usually from over-fueling or a bad tune.
The fixForged pistons and a conservative, properly-built tune for high-HP setups.
05
Up-pipe & EGR cooler leaks
Exhaust ticking, lost boost, and coolant loss from cracked up-pipes and coolers.
The fixReplace leaking up-pipes and address or delete the EGR cooler (off-road).
06
Radiator support / cab mount rot
Clunks and movement as factory cab mounts and the radiator support corrode.
The fixReplace cab mounts and repair or reinforce the radiator support.
07
Compound turbo failures
Lost boost, noise, or oil leakage from the high- or low-pressure turbo.
The fixRebuild or upgrade the compound turbo set and service oil feed/drain lines.
08
Injector failure
Misfire, smoke, and fuel-in-oil from worn or leaking piezo injectors.
The fixTest and replace failed injectors with quality units.
09
High-pressure fuel pump wear
Hard start and power loss as the HPFP loses the ability to hold rail pressure.
The fixInspect and replace the fuel pump; add a lift pump to extend its life.
10
Water pump failure
Coolant weep and overheating from a worn front-mounted water pump.
The fixReplace the water pump and refresh the cooling system.
Most-requested upgrades
Top 10 upgrades owners do to the 6.4L Power Stroke
The modifications that add reliability and power. We install every one of these in the shop.
01
EGR / DPF delete + tuning
Ends regen and emissions failures and frees up power (off-road use).
02
Upgraded radiator
Solves the 6.4's signature cooling failure permanently.
03
Forged pistons & rods
Bottom-end strength for reliable high-horsepower builds.
04
Custom tuning
Adds power, improves economy, and tames the regen strategy.
05
Lift pump / fuel system
Protects the HPFP and supplies fuel for added power.
06
Compound turbo upgrade
Bigger chargers for more air and stronger, cooler power.
07
Full gauge package
EGT, boost, fuel pressure, and trans temp to run it safely.
08
4" exhaust & intake
Lowers EGTs and helps the engine breathe under load.
09
Coolant filtration
Keeps the cooling system clean and protects the new radiator.
10
Built 5R110 transmission
Holds the 6.4's big torque numbers without slipping.
Got one of these on your 6.4L Power Stroke?
Call the shop for a real diagnosis, or shop the O-Ringless parts and upgrades we install on our own builds.