Ford's 3.5L EcoBoost engine has become a staple in their lineup, powering everything from the F-150 to the Explorer. But like any complex piece of machinery, it has undergone revisions and improvements over its lifespan. Understanding when these changes occurred is crucial for anyone looking to buy a used vehicle, diagnose engine problems, or simply stay informed about the technology under their hood. The most significant refresh of the 3.5L EcoBoost, marking a substantial leap in performance and reliability, occurred for the 2017 model year.
The Original EcoBoost: A Bold Gamble that Paid Off
The 3.5L EcoBoost engine first debuted in 2010, representing a significant departure from Ford's traditional reliance on naturally aspirated V8s. The "EcoBoost" moniker itself hints at the engine's core design philosophy: combining turbocharging and direct fuel injection to deliver V8-like power with V6-like fuel economy. This wasn't just marketing hype; the initial 3.5L EcoBoost proved to be a capable and versatile engine, finding its way into a wide range of Ford and Lincoln vehicles.
However, the early models weren't without their quirks. Issues such as timing chain stretch, condensation buildup in the intercooler (leading to a "shudder" under acceleration), and potential for carbon buildup on the intake valves were documented. While Ford addressed many of these concerns through technical service bulletins (TSBs) and running changes, the need for a more comprehensive overhaul was evident as the engine aged.
Why the Redesign Was Necessary
Several factors drove the need for a significant redesign of the 3.5L EcoBoost:
Increased Power Demands: As trucks like the F-150 evolved, customers demanded more power and torque for towing and hauling. The original engine, while respectable, was approaching its performance limits.
Fuel Economy Standards: Stringent fuel economy regulations were constantly tightening, necessitating improvements in engine efficiency.
Reliability Concerns: While the EcoBoost was generally reliable, certain issues needed to be addressed to improve long-term durability and reduce warranty claims.
Competition: Other manufacturers were introducing advanced engine technologies, forcing Ford to stay ahead of the curve.
Essentially, the redesign was a strategic move to ensure the 3.5L EcoBoost remained a competitive and desirable engine option for years to come.
What Changed in the 2017 Redesign? A Deep Dive
The 2017 redesign wasn't just a minor tweak; it was a comprehensive overhaul that touched nearly every aspect of the engine. Here's a breakdown of the key improvements:
New Cylinder Heads: The redesigned cylinder heads featured a revised combustion chamber design for improved efficiency and reduced knock sensitivity. They also incorporated a new integrated exhaust manifold design, which helps to warm up the engine faster and improve fuel economy.
Stronger Internals: The engine received stronger connecting rods and a forged steel crankshaft to handle the increased power output. This addressed some of the concerns about the long-term durability of the original engine under heavy loads.
New Turbochargers: The redesigned turbos offered improved response and higher boost pressure, contributing to the engine's increased horsepower and torque. They were also designed to be more durable and reliable.
Direct and Port Fuel Injection: One of the most significant changes was the addition of port fuel injection alongside the existing direct injection system. This dual-injection setup helps to reduce carbon buildup on the intake valves, a common issue with direct-injection engines. The port injectors also improve cold-start performance and reduce emissions.
Revised Cooling System: An updated cooling system was implemented to better manage the increased heat generated by the more powerful engine. This included a larger radiator and improved coolant flow.
New Engine Management System: A more advanced engine management system (EMS) was used to control the engine's various functions, optimizing performance and efficiency. This allowed for more precise control over fuel injection, ignition timing, and turbocharger boost.
10-Speed Automatic Transmission: While not technically part of the engine itself, the 2017 F-150 (the first vehicle to receive the redesigned engine) also featured a new 10-speed automatic transmission. This transmission's wider gear ratio spread contributes to improved fuel economy and performance. The transmission also works in concert with the engine management system to optimize shift points for different driving conditions.
In short, the 2017 redesign resulted in a more powerful, efficient, and reliable 3.5L EcoBoost engine.
Identifying the Redesigned Engine: How to Tell the Difference
So, how can you tell if a vehicle has the redesigned 3.5L EcoBoost? Here are a few key indicators:
Model Year: The most obvious indicator is the model year. If the vehicle is a 2017 or newer, and it has a 3.5L EcoBoost, it's likely the redesigned engine. However, always double-check to be sure, especially with vehicles produced in late 2016 or early 2017.
Horsepower and Torque Ratings: The redesigned engine typically produces higher horsepower and torque figures than the original. For example, in the F-150, the redesigned engine produces 375 horsepower and 470 lb-ft of torque, compared to the original's 365 horsepower and 420 lb-ft of torque. Check the vehicle's specifications to confirm the engine's output.
10-Speed Transmission: As mentioned earlier, the redesigned engine was initially paired with a 10-speed automatic transmission in the F-150. If the vehicle has a 10-speed transmission, it's a strong indication that it also has the redesigned engine.
Visual Inspection (Difficult): Visually differentiating between the two engines can be challenging without specific knowledge. There are subtle differences in the engine bay layout and component placement, but these are not always easy to spot.
Check the Vehicle's VIN: A dealership or reputable mechanic can use the vehicle's VIN (Vehicle Identification Number) to determine the exact engine configuration. This is the most reliable way to confirm whether a vehicle has the redesigned engine.
The Impact of the Redesign: Real-World Benefits
The 2017 redesign of the 3.5L EcoBoost had a significant impact on vehicle performance and ownership experience:
Improved Performance: The increased horsepower and torque resulted in quicker acceleration, better towing capacity, and improved overall driving dynamics.
Enhanced Fuel Economy: The combination of direct and port fuel injection, along with the 10-speed transmission, helped to improve fuel economy, especially in real-world driving conditions.
Increased Reliability: The stronger internals, revised cooling system, and dual-injection system contributed to improved engine reliability and reduced the risk of common issues such as carbon buildup.
Smoother Operation: The redesigned engine generally runs smoother and quieter than the original, providing a more refined driving experience.
Frequently Asked Questions
What year did Ford redo the 3.5 EcoBoost engine? The major redesign of the 3.5L EcoBoost engine occurred for the 2017 model year. This included significant changes to the cylinder heads, internals, turbochargers, and fuel injection system.
Did the redesign fix all the problems with the original EcoBoost? The 2017 redesign addressed many of the common issues with the original engine, such as timing chain stretch and carbon buildup, but it doesn't eliminate all potential problems. Regular maintenance and proper driving habits are still crucial for long-term reliability.
Is the redesigned 3.5 EcoBoost more reliable? Yes, the redesigned engine is generally considered to be more reliable than the original, thanks to its stronger components and improved design. However, any engine can experience problems, so it's important to follow the manufacturer's recommended maintenance schedule.
What vehicles have the redesigned 3.5 EcoBoost? The redesigned engine first appeared in the 2017 F-150 and has since been used in various Ford and Lincoln models, including the Expedition, Navigator, and Explorer. Always check the specific vehicle's specifications to confirm the engine configuration.
How much horsepower does the redesigned 3.5 EcoBoost have? Horsepower figures vary depending on the specific application, but the redesigned engine typically produces around 375-450 horsepower. Check the vehicle's specifications for the exact horsepower rating.
Final Thoughts
The 2017 redesign of the 3.5L EcoBoost engine was a pivotal moment, transforming it from a promising technology into a truly exceptional powerplant. Understanding the changes implemented in this redesign is crucial for anyone considering purchasing a vehicle equipped with this engine, ensuring they're aware of the potential benefits and improvements offered by the updated version. When in doubt, always consult a trusted mechanic or Ford dealership to verify the specific engine configuration of a vehicle.