6.4 Powerstroke Repair for the Fuel System, Turbos, Coolers and DPF
6.4 Powerstroke repair starts with finding why it failed, whether that is fuel in the oil, a leaking radiator or EGR cooler, a plugged DPF or a cracked up-pipe. We find the cause, tell you what can wait and group repairs that share a teardown.
What Ford changed with the 6.4, and what it means for you
Ford sold the 6.4L Power Stroke from 2008 to 2010 with a new fuel system, new turbos and new exhaust.
Fuel and air
The 7.3 and 6.0 fired their injectors with engine oil. The 6.4 went to high-pressure common rail: a pump pressurizes a fuel rail and piezo injectors fire in fast, precise pulses. Water or debris is hard on that system, so filters matter. Boost comes from BorgWarner compound turbos, a small and a large one in series.
Emissions and cooling
The 6.4 was the first Power Stroke with a diesel particulate filter (DPF). It burns off soot in a regeneration, or regen, partly by adding fuel in the cylinders, and some of that fuel ends up in the oil. It also carries two EGR coolers and a radiator that is known to leak.
Every emissions part on a 6.4 gets diagnosed and repaired to work as designed. We do not do delete work.
What is your 6.4 doing?
Pick the closest match.
Fuel in the oil
Oil that reads overfull or smells like diesel usually means fuel is getting into it during regens. Thinned oil protects bearings and turbos less, so do not wait on it.
- Oil level and smell
- How often regens run and whether they finish
- Injectors that could be adding extra fuel
Radiator or EGR cooler
A drip under the front points to the radiator. Coolant loss with no puddle and white smoke at startup often means an EGR cooler.
- Cooling system pressure test
- Radiator seams and hose connections
- Both EGR coolers for internal leaks
Restriction in air, fuel or exhaust
Reduced power can come from a plugged DPF, a boost leak, a turbo or low rail pressure. Codes narrow it down; testing confirms it.
- DPF pressure readings and soot load
- Boost from both turbos under load
- Rail pressure, commanded versus actual
Injectors and fuel supply
A miss, a lope at idle or smoke can come from a sticking piezo injector, weak fuel supply or water in the fuel.
- Injector balance and contribution data
- Fuel filters and the water separator
- Glow plug operation on cold starts
Up-pipes and manifold joints
A tick that rises with rpm, or exhaust smell in the cab, often means a leaking up-pipe or manifold joint, which also robs the turbos.
- Up-pipe joints and gaskets
- Manifold bolts and flanges
- Soot tracks near the turbo inlet
Where the 6.4 gives trouble
We check these on every 6.4.
DPF and regens
Interrupted regens let soot pile up until power drops. We find out why it is not cleaning itself.
DPF repairTwo EGR coolers
A cracked cooler leaks coolant into the exhaust and can foul the DPF. We check both.
EGR cooler replacementPiezo injectors and fuel
Rough idle or a hard start can trace to injectors, rail pressure or bad fuel. We read the data first.
Diesel injector repairCompound turbos
Two turbos, two sets of bearings and seals. Low boost or a new whistle gets traced to the right one.
Diesel turbo repairRadiator and cooling
The radiator is a known leaker and the stacked coolers trap debris. Summer towing finds every weak spot.
Truck overheating repairUp-pipes
The pipes feeding exhaust to the turbos leak at their joints. We do them with the turbos when it saves labor.
Why some 6.4 jobs start by lifting the cab
Ford packed the 6.4 tight. The turbos, up-pipes and the back of the heads sit under the rear of the cab, so on many big jobs we unbolt the body mounts and lift the cab off. It is often the faster, cleaner way in.
If the turbos come out and an up-pipe leaks too, you pay for that teardown once, and only with your approval.
- Turbo and up-pipe work at the back of the engine
- EGR cooler work when it shares a teardown with turbo or head work
- Head gaskets and other top-end work
What moves the price of 6.4 Powerstroke repair
One symptom can be a sensor or a cab-off job, so we quote after diagnosis.
| Cost factor | Why it changes the job |
|---|---|
| What failed and why | A DPF plugged by a leaking EGR cooler means fixing both, or the new filter plugs too. |
| Cab on or cab off | Reaching the turbos, up-pipes or heads can mean lifting the cab. |
| Shared teardown | Repairs behind the same parts get done together, so that labor is paid once. |
| Contamination | Water in the fuel or coolant in the exhaust adds cleanup. |
Most 6.4 work is drop-off. Diagnosis typically takes 24 to 72 hours depending on workload. The shop is open Monday to Friday, 8:00 AM to 6:00 PM. More on our What to Expect page.
In a customer's own words
From Google, word for word.
319 reviews
- Customer
- Colton Peterson
Big fan of bodacious. Very knowledgeable and helpful. Far and away the most honest shop I've dealt with in my adult life. They provide detailed and accurate quotes, charge fair prices, don't sell unnecessary repairs, and will even give you tips on small DIY tasks. Will be bringing the clapped out 6.6 back.5 STARS
How a 6.4 job runs from phone call to road test
Every 6.4 gets our diesel diagnostics process before parts are ordered.
Tell us what it does
When it happens, what lights are on and what has been replaced.
Test the whole truck
Factory-level scan data, pressure tests and the rest of the truck.
Call with the plan
What needs attention now, what can wait and which repairs share labor.
Repair and prove it
A test drive when the job calls for it, then a code recheck.
Grades, cold starts and short trips on a 6.4
Towing over the passes loads the cooling system for miles, which is when a seeping radiator or tired EGR cooler quits. In winter, cold starts and quick errands rarely let a regen finish, so soot builds and more fuel reaches the oil.
Dropping coolant or high oil? Get it checked before the trailer goes on. Between trips, let regens finish, check the dipstick and keep debris out of the cooler stack.
6.4 Powerstroke questions owners ask us
What 2008 to 2010 Super Duty owners ask most.
It has known weak spots: the radiator, the EGR coolers, the up-pipes and fuel dilution of the oil from regens. Caught early, most are ordinary repairs. Most 6.4 Powerstroke repair work is fixing those known spots, and we find which ones your truck has before we quote.
Usually fuel. During a regen the engine adds fuel in the cylinders to heat the DPF, and some gets past the rings into the oil. Short trips on cold Colorado mornings interrupt regens and make it worse, so have it checked if the level keeps rising.
No. Radiator work, sensors, filters and plenty of other repairs happen with the cab on. Lifting it makes sense for turbos, up-pipes or head work, and we tell you before we quote it.
Briefly, but power drops as the filter fills and it can end up in limp mode. When regens will not finish, the reason is often upstream: an injector, an EGR cooler leak or a sensor. We check those before we replace a filter on any 6.4 Powerstroke repair.
Very little under the hood. The 6.0 fires its injectors with engine oil and runs one turbo, while the 6.4 uses common rail, compound turbos and a DPF. Our 6.0 Powerstroke repair page covers the older engine.
Tell us what your 6.4 Powerstroke is doing
Send the year, the engine and what you are seeing, and we'll get back to you as quickly as we can.
- Year, make and engine
- What it is doing, and when it started
- Any codes or recent repairs
Rather talk it through? Call (303) 808-1563
6.4 losing coolant, making oil or dropping into limp mode? Call the shop
Tell us what the truck is doing and when it happens, or use Request Service to send the details. Or drop us a line right here from the website and we'll get back to you as quickly as we can.