2008–2010 FORD SUPER DUTY · 6.4L POWER STROKE
6.4 Power Stroke repair in Tucson: weak points & fixes.
The 6.4 makes strong power from its twin turbos, but it was Ford’s first diesel with a DPF and it runs hot. Most of its trouble comes from heat, regens and a few known parts. Here’s what we see on these trucks and how we fix it at your location.
- 350 hp650 lb-ft stock
- Common railtwin turbos · DPF · EGR
- 5R110W · ZF6transmissions
- We come to youTucson & nearby
Jump to a system
KNOW YOUR TRUCK
One engine, three model years.
Ford rated the 6.4 the same all three years. What changes the fix is mileage, how it’s been maintained and what’s already been replaced.
6.4 Power Stroke
- 350 hp / 650 lb-ft every year
- Twin sequential turbos
- First Power Stroke with a DPF; no DEF
- Two EGR coolers (horizontal and vertical)
- 5R110W automatic or ZF6 manual
Before we quote
- Has the radiator been replaced?
- Have the EGR coolers been replaced?
- Oil change history (fuel dilution matters)
- Any tuning in the past
POWER THROUGH THE YEARS
Where the 6.4 Power Stroke fits in Power Stroke history.
Peak factory pickup ratings by generation, horsepower and torque. Yours is highlighted. Tap any bar to see that generation.
- Horsepower
- Torque (lb-ft)
WEAK POINTS, SYSTEM BY SYSTEM
What fails on the 6.4 Power Stroke, and how we fix it.
Tap a system to see what fails, what you’ll notice and how we fix it. Common = we see it often. Towing / tuned = shows up with heavy loads or added power. High miles = age and wear items.
Radiator & cooling
Leaking radiatorCommon
You’ll notice: coolant puddles, a sweet smell, low coolant warnings, running hot when towing.
Why: The factory radiator often splits where the aluminum core meets the plastic tanks, helped along by frame flex and heat.
Our fix: We replace it with a Mishimoto radiator built to handle frame flex, and pressure-test the whole system.
Clogged oil coolerCommonTowing / tuned
You’ll notice: oil running much hotter than coolant, then EGR cooler trouble.
Why: Like the 6.0, the oil cooler can clog with debris. When it does, the EGR coolers get less coolant and overheat.
Our fix: We replace the oil cooler, flush the system and add coolant filtration when it makes sense.
EGR coolers, DPF & regens
Failed EGR coolersCommonTowing / tuned
You’ll notice: white smoke, coolant loss with no visible leak, limp mode.
Why: The 6.4 has two EGR coolers. Heat and soot crack or plug them, and the horizontal one usually goes first.
Our fix: We replace both with Bullet Proof Diesel EGR coolers, since one failure usually means the other is close.
Fuel dilution and frequent regensCommon
You’ll notice: rising oil level, fuel smell in the oil, regen messages, poor mileage.
Why: The 6.4 adds extra fuel during regens to heat the DPF, and some of it ends up in the oil.
Our fix: We change oil on a shorter schedule, check the DPF and sensors, and fix what’s causing extra regens. We keep every truck emissions legal.
Turbos & exhaust
Cracked up-pipesCommon
You’ll notice: exhaust leak noise, low boost, slow turbo response.
Why: The flexible joints on the pipes from the manifolds to the turbos crack from heat and vibration.
Our fix: We replace them with upgraded up-pipes and new gaskets.
Turbo wearHigh milesTowing / tuned
You’ll notice: low power, whistling, oil in the boost tubes.
Why: Two turbos and a lot of heat mean bearings and seals wear with miles.
Our fix: We find which turbo is failing and repair or replace it with quality parts.
Fuel system
Fuel contamination and pump failureCommon
You’ll notice: hard starts, stalling, rail pressure codes, metal in the filters.
Why: The 6.4 has no lift pump from the factory, so the high-pressure pump pulls fuel. Water and dirt hurt the pump and injectors.
Our fix: We find the cause and repair the fuel system, then add a FASS lift pump with water separation and filtration to protect it.
Injector problemsHigh miles
You’ll notice: rough running, smoke, a miss, fuel in the oil.
Why: Bad fuel and age wear the injectors and their seals.
Our fix: We test and replace failed injectors with quality new or remanufactured parts.
Engine
Head gasketsTowing / tuned
You’ll notice: coolant loss, overheating, pressure in the cooling system.
Why: Heat and high cylinder pressure, especially with past tuning, stress the head gaskets.
Our fix: We replace the gaskets and upgrade the head fasteners while the heads are off.
5R110W transmission
Harsh or slipping shiftsTowing / tunedHigh miles
You’ll notice: harsh shifts, slipping, high transmission temps while towing.
Why: Heat and old fluid wear clutches and the solenoid body.
Our fix: We service it with the correct fluid, add a deeper pan, and repair or replace it with a Jasper remanufactured unit when needed.
Front end & steering
Death wobble and loose steeringCommonHigh miles
You’ll notice: a violent shake after a bump, wandering, play in the steering.
Why: Worn ball joints, track bar bushings, tie rods and stabilizer let the heavy front end shake.
Our fix: We rebuild the front end with heavy-duty parts and set the alignment.
RELIABILITY UPGRADES
Bulletproof it in the right order.
If you plan to keep your 6.4, these are the upgrades we recommend, in the order that protects the engine best.
- RadiatorA Mishimoto radiator stops the leaks the factory radiator is known for.Call nowRequest a quote
- EGR coolersBullet Proof Diesel horizontal and vertical EGR coolers replace the failure-prone factory ones.Call nowRequest a quote
- Lift pump and filtrationA FASS lift pump keeps the high-pressure pump from pulling fuel and catches water and dirt.Call nowRequest a quote
- Up-pipesUpgraded up-pipes fix the common exhaust leak before it hurts turbo response.Call nowRequest a quote
- Oil changes and oil analysisShorter oil changes keep fuel dilution under control.Call nowRequest a quote
- GaugesWatching coolant, oil and transmission temps warns you before something fails.Call nowRequest a quote
- Transmission and axle coolingA deeper transmission pan and a Banks Ram-Air rear cover keep fluids cooler in the heat.Call nowRequest a quote
MAINTENANCE SCHEDULE
6.4 Power Stroke service intervals.
These are Ford’s factory intervals from the owner’s manual schedule. The factory “severe” column covers towing, dusty roads, short trips and long idling, which describes most working trucks in Southern Arizona. Our recommendation follows the severe schedule, with oil every 5,000 miles and fuel filters every 10,000.
| Service | Factory, normal use | Factory, severe use | Our recommendation |
|---|---|---|---|
| Engine oil & filter | 10,000 mi / 6 months | 5,000 mi / 6 months | Every 5,000 mi |
| Fuel filters | 20,000 mi / 24 months | 10,000 mi / 400 hours | Every 10,000 mi |
| Engine air filter | When the filter minder shows it | Same | When the filter minder shows it |
| Coolant | 100,000 mi / 6 years first, then 50,000 mi / 36 months | Same | 100,000 mi / 6 years first, then 50,000 mi / 36 months |
| 5R110 fluid & filters | 30,000 mi | Same | 30,000 mi |
| Manual transmission fluid (ZF6) | 100,000 mi | 60,000 mi | 60,000 mi |
| Transfer case fluid | 150,000 mi | 60,000 mi | 60,000 mi |
| Front axle fluid | 150,000 mi | 50,000 mi | 50,000 mi |
| Rear axle fluid | 150,000 mi (F-250/F-350); 50,000 mi (F-450/F-550) | 50,000 mi | 50,000 mi |
Always go by your owner’s manual for your exact truck. Factory figures are maximums, and the dash service reminder comes first when it shows sooner.
WANT MORE POWER?
6.4 Power Stroke performance upgrades.
Staged builds, lift pumps, transmission, exhaust and suspension upgrades for the 6.4 Power Stroke.
BUYING A 6.4 POWER STROKE?
Get it inspected before you buy.
Our Diesel Pre-Purchase Inspection checks the engine, fuel system, transmission and front end, and looks for signs of past problems. We meet you at the seller.
How mobile service worksTell us your truck and where it is, we diagnose on site, you approve a written estimate, and we fix it where it sits.
See how it works →PLAIN-ENGLISH GLOSSARY
6.4 Power Stroke terms, explained.
- Common rail
- A fuel system where a pump keeps fuel at very high pressure in a shared rail feeding electronic injectors.
- Compound turbos
- Two turbos working in sequence, a small one for quick response and a large one for top-end power.
- DPF
- Diesel particulate filter. Traps soot and burns it off during a regen.
- Regen
- When the truck heats the DPF to burn off soot. On the 6.4 this adds extra fuel.
- Fuel dilution
- Diesel fuel mixing into the engine oil, which thins it.
- EGR cooler
- Cools exhaust gas before it goes back into the intake. The 6.4 has two.
- Up-pipes
- The exhaust pipes from the manifolds to the turbos. Their flex joints crack on the 6.4.
- 5R110W
- Ford’s TorqShift five-speed automatic.
Name-brand partsWe install proven brands like Mishimoto, Bullet Proof Diesel, FASS, Edge, Banks, aFe, PPE, Jasper and Bilstein.
See all the brands we install →OWNER QUESTIONS
6.4 Power Stroke questions, answered.
Is the 6.4 Power Stroke worth keeping?
It can be. Once the radiator, EGR coolers, up-pipes and fuel system are handled, and the oil is changed often, a 6.4 can run strong for a long time.
Why does my oil level go up?
On the 6.4, some fuel ends up in the oil during DPF regens. A little is normal, but a lot means too many regens or another problem, and it needs a look.
Do you delete emissions equipment?
No. We repair and upgrade with emissions-legal parts only.
Why don’t you list prices for these repairs?
Every truck is different by now. Mileage, past repairs and how it’s used all change the parts and labor. Call us at 520-990-1033 and we’ll quote your truck.
What warranty do repairs have?
Repair labor is backed for 1 year or 12,000 miles, and new parts carry their manufacturer’s warranty. Warranty details →
LET’S TALK ABOUT YOUR TRUCK
Call, text or request a quote.
Tell us your year, mileage and what you want done. We’ll recommend the right repair, quote it and come to you.