How the 6.4L EGR System Is Actually Built
Ford's service description for this engine lists four EGR parts:
- The EGR valve and EGR housing
- A horizontal EGR cooler assembly
- A vertical EGR cooler assembly
- An EGR oxidation catalyst (OC)
Exhaust leaves the turbo up pipes and enters the EGR OC first. Ford's stated reason for that part is to reduce lacquer formation in the EGR system by converting heavy hydrocarbons into dry soot, which protects the effectiveness of the coolers. From there the gas passes through the two coolers.
The 6.4L has two coolers in series to meet its exhaust cooling requirement, and they are a shell-and-tube design. That is one EGR system with a two-stage cooler stack, not two independent EGR circuits. Ford also states the EGR is used in over 80 percent of engine operating modes on this engine, which goes a long way toward explaining how much soot the system moves.
The cooled gas then goes to the EGR valve, mounted in the EGR housing, which meters it into the clean air stream.
The coolant path, and why it matters at install time
Ford's cooling system description routes coolant from the front cover supply port to the horizontal cooler first, then through a short connection hose into the vertical cooler, then back to the front cover return.
A small port at the top of the vertical cooler feeds coolant to the EGR valve, and from there it goes to the degas bottle. That passage is the highest point in the system and works as the deaeration port. Ford warns that if that port or its hose is blocked, the EGR coolers and the EGR valve can be damaged.
Two practical takeaways:
- The degas bottle on this truck lives on the left side of the engine compartment, integrated into the left battery tray. That is where you check coolant.
- Anything that stops coolant from flowing through both coolers, including trapped air after a cooling system repair, puts the coolers at risk. Bleeding the system correctly is not optional.
The turbochargers
The 6.4L uses compound (two-stage) turbocharging, not a parallel twin setup. Air goes through the larger low-pressure turbo first, then the smaller high-pressure turbo, then the intercooler and intake. Exhaust drives the high-pressure turbo first, then the low-pressure unit. The high-pressure turbo uses variable turbine geometry with an electric actuator.
This matters because the EGR system, the charge air cooler, and the turbos all sit in the same crowded space, and EGR faults and boost faults can present with overlapping symptoms. See the 6.4L Powerstroke specs and issues guide for the other known problem areas on this engine.
EGR Problem or DPF Problem?
These two systems interact, but they are not the same fault and they do not have the same fix. Before buying anything, get the truck scanned and find out which side of the engine you are chasing.
Signs that point toward the EGR side:
- Coolant loss with no visible external leak.
- White smoke.
- Codes relating to EGR flow or EGR cooling performance.
A known DPF behavior worth understanding:
The 6.4L regenerates its DPF using extra fuel injected by the main injectors late in the combustion cycle (post-injection). That fuel is meant to burn in the exhaust rather than in the cylinder. Some of it does not. It can wash the oil film off the cylinder walls and get past the rings into the crankcase, and over time that shows up as an oil level that rises instead of falling.
If your oil level is climbing, that is a fuel dilution symptom, and it comes from the regeneration strategy, not from the EGR coolers. Have it looked at. Diluted oil loses its ability to protect bearings and valvetrain parts.
What an EGR Delete Kit Includes
Important: the parts below are for off-road, race, or non-public-road use where permitted, as set out in the notice at the top of this page.
A 6.4L Powerstroke EGR delete kit removes the EGR hardware and seals the openings it leaves behind:
- Block-off hardware for the EGR cooler ports at the exhaust and intake sides.
- A coolant plug or bypass arrangement. The coolers are part of the engine's coolant circuit. When they come out, coolant flow through that circuit has to be maintained or sealed correctly. This is the step that causes the most repeat problems when it is skipped or done carelessly.
- Intake side sealing. The EGR valve feeds the intake, so that opening has to be closed off properly to avoid an air leak that would throw off fueling and boost.
- A matching tune. The PCM watches EGR-related inputs and will set codes when the hardware is gone. EngineGo's 6.4L packages pair the hardware with a 6.4L Powerstroke tuner, and our all-in-one listings on this platform use the Mini Maxx v1. Ask us what we currently stock and support if you want to compare platforms.
If you want the hardware and the tuning in one order, the 6.4L Powerstroke delete kit collection bundles those pieces.
Installation Notes
This is not a beginner job. It involves draining and refilling the cooling system, working around the turbochargers, and getting the air out of a cooling system that has to feed two coolers in series.
- Let the engine cool completely before any cooling system work.
- Disconnect the batteries and label sensor connectors before you pull anything.
- Have a plan for the coolant you drain, and use the correct coolant for this engine.
- Bleed the cooling system fully before you drive it. Trapped air is what damages coolers.
- Check the degas bottle port and hose that feed the EGR valve. A blocked one is a documented cause of cooler and valve damage.
- Flash the tune before first start, so the PCM is not watching for hardware that is not there.
If you are not confident about the cooling system work, have a shop handle that part. Do not guess at torque values. Use the service information for your truck.
Tuner and Warranty Questions
Do I need a tune with an EGR delete?
Yes. The PCM monitors EGR-related inputs, and hardware without a matching calibration will set codes and can put the truck into reduced power.
Does an EGR delete void my warranty?
Not automatically. Under the Magnuson-Moss Warranty Act, using aftermarket parts does not by itself void your warranty. A manufacturer or dealer can deny coverage for a specific problem only if they can show the aftermarket part caused it, and the rest of the warranty still applies to unrelated issues. That is the federal rule, and it is worth knowing before anyone tells you otherwise.
Is an EGR Delete Legal?
Not for on-road use. Removing or disabling emissions equipment on a vehicle used on public roads violates the federal Clean Air Act and many state laws. An off-road use disclaimer does not change how an EPA-certified vehicle is treated under federal law. Check federal, state, and local rules for your situation before buying or installing anything.
Shipping and Returns
Most orders are processed the same or next business day, excluding Sundays, unless otherwise stated. Most packages are delivered within 3 to 5 business days after leaving the warehouse, depending on package size, location, and carrier conditions.
Returns are accepted within 45 calendar days of delivery on unused, uninstalled parts in original condition with all included hardware. Installed, modified, or damaged parts may not be returnable. Electronic parts and tuners may have stricter return limits, and kits that include a tuner may differ. Return shipping may be the customer's responsibility on returns for buyer's reasons. Contact us for an RMA before shipping anything back.
Next Step
Send us your VIN and tell us the code your scanner is showing. We will confirm which 6.4L kit fits your truck and whether your situation is an EGR or a DPF problem before you order.
