2017 Ford Explorer 3.5 Firing Order – Correct Cylinder Layout

The 2017 Ford Explorer equipped with the 3.5L V6 engine follows a specific sequence to balance internal forces and ensure smooth combustion. Knowing the 2017 ford explorer 3.5 firing order is essential for diagnosing misfire codes, replacing ignition coils, or performing a standard spark plug service.

If you have ever felt your Ford Explorer shuddering at a red light or noticed a flashing check engine light, you know how stressful engine trouble can be. Diagnosing these issues often starts with understanding how the engine breathes and fires.

This guide provides the exact 2017 ford explorer 3.5 firing order and a detailed map of the cylinder locations. Whether you are a weekend DIYer or an off-road enthusiast preparing for a long trip, these steps will help you maintain your vehicle with confidence.

We will walk through the physical layout of the engine, the tools you need for the job, and the common pitfalls to avoid when working on the Ford 3.5L platform. Let’s get your Explorer back to peak performance.

Understanding the 2017 Ford Explorer 3.5 Firing Order and Cylinder Map

The 2017 ford explorer 3.5 firing order is 1-4-2-5-3-6. This sequence is the specific timing in which the spark plugs ignite the air-fuel mixture in each cylinder. Maintaining this order is critical for engine balance and power delivery.

To use this information effectively, you must first know where each cylinder is located on the engine block. In the 2017 Explorer, the 3.5L engine is mounted transversely, which means it sits “sideways” in the engine bay. This layout can be confusing for those used to rear-wheel-drive vehicles.

The cylinders are divided into two “banks.” Bank 1 is located at the rear of the engine bay, closest to the firewall. Bank 2 is located at the front of the engine bay, closest to the radiator. Understanding this distinction is the first step in any successful ignition repair.

Cylinder Numbering Breakdown

On the 3.5L V6 (both the Ti-VCT and EcoBoost versions), the cylinders are numbered as follows:

• Bank 1 (Rear/Firewall): Cylinders 1, 2, and 3 (from passenger side to driver side).
• Bank 2 (Front/Radiator): Cylinders 4, 5, and 6 (from passenger side to driver side).

If you receive a diagnostic trouble code (DTC) such as P0302, it indicates a misfire in cylinder number 2. Looking at our map, you now know that cylinder 2 is the middle cylinder on the rear bank, tucked under the intake manifold.

Identifying Your 3.5L Engine: Ti-VCT vs. EcoBoost

The 2017 Ford Explorer came with two variations of the 3.5L engine. While they share the same 2017 ford explorer 3.5 firing order, the physical components and access points differ slightly. Identifying your specific engine helps you buy the right parts.

The standard 3.5L Ti-VCT (Twin Independent Variable Camshaft Timing) is a naturally aspirated engine. It is known for its reliability and is common in the XLT and Limited trims. It uses a large plastic intake manifold that covers the rear bank of spark plugs.

The 3.5L EcoBoost is a twin-turbocharged powerhouse found in the Sport and Platinum trims. This engine has additional intercooler piping and vacuum lines. While it follows the same 1-4-2-5-3-6 firing sequence, the turbocharged nature means spark plug gap and heat range are even more critical.

Which One Do You Have?

Check your engine cover or the VIN (Vehicle Identification Number). If you see “EcoBoost” embossed on the plastic cover or notice two turbochargers tucked near the exhaust manifolds, you have the boosted version. If the engine looks more open and lacks turbo piping, it is likely the standard Ti-VCT.

Regardless of the version, the 2017 ford explorer 3.5 firing order remains identical. This consistency is helpful for Ford owners who might own multiple vehicles on the same platform, such as the Ford Flex or Taurus.

Step-by-Step Guide to Accessing Spark Plugs and Ignition Coils

Accessing the front bank (Cylinders 4, 5, and 6) is straightforward. However, the rear bank (Cylinders 1, 2, and 3) requires more effort. You will need to remove the upper intake manifold to reach these components safely.

1. Disconnect the Battery: Always start by removing the negative battery cable to prevent electrical shorts or accidental start-ups.
2. Remove the Engine Cover: Most covers pop off with a firm upward pull or by removing a few decorative nuts.
3. Clear the Intake Path: Remove the air intake tube and disconnect the electrical connectors for the MAP sensor and throttle body.
4. Unbolt the Upper Manifold: There are several 8mm or 10mm bolts holding the plastic manifold to the engine. Once these are out, carefully lift the manifold to reveal the rear ignition coils.
5. Swap the Coils/Plugs: Work on one cylinder at a time to ensure you don’t mix up the wiring harness connectors.

When you are putting everything back together, ensure the intake manifold gaskets are clean and seated properly. A vacuum leak here will cause a rough idle, even if your spark plugs are brand new. Using a small amount of dielectric grease on the coil boots can prevent future moisture intrusion.

Common Symptoms of a Firing Order Mismatch or Ignition Failure

Problems with the 2017 ford explorer 3.5 firing order or its related components usually manifest in very obvious ways. Because the PCM (Powertrain Control Module) monitors every combustion event, it will usually trigger a warning light quickly.

A “misfire” occurs when the air, fuel, or spark fails to ignite at the exact moment required by the firing sequence. This breaks the rhythm of the engine, leading to a loss of counter-balance and creating noticeable vibrations.

What to Look For

• Flashing Check Engine Light: This indicates a “catalyst-damaging” misfire. You should stop driving immediately to avoid melting your catalytic converters.
• Hesitation Under Load: If the car stumbles when you accelerate onto a highway, it is a classic sign of a weak ignition coil or a worn spark plug.
• Poor Fuel Economy: Unburnt fuel being pushed out of the exhaust means you are literally throwing money out of the tailpipe.
• Rough Idle: If the steering wheel shakes while you are stopped at a light, one of the cylinders in the firing sequence is likely “dead.”

If you have recently replaced your spark plug wires or coils and the engine runs worse than before, double-check your work. It is easy to accidentally swap the connectors for Cylinder 1 and Cylinder 2, which will throw off the 2017 ford explorer 3.5 firing order timing and cause severe bucking.

Essential Tools and Safety Precautions for V6 Engine Work

Working on a modern V6 requires more than just a basic wrench set. To do the job right and avoid breaking fragile plastic clips, you should gather a few specialized tools before you start.

A torque wrench is non-negotiable. Spark plugs in aluminum cylinder heads must be tightened to specific specs (usually around 133 lb-in or 11 lb-ft). Over-tightening can strip the threads, while under-tightening can cause the plug to blow out of the head.

You will also need a 5/8-inch spark plug socket with a rubber insert or magnet. This holds the plug securely so you don’t drop it down the deep well and crack the porcelain insulator. A crack so small you can’t see it will cause a persistent misfire.

Safety First

Never work on a hot engine. The 3.5L engine retains heat for a long time, especially in the rear bank near the firewall. Wait at least two hours after driving before attempting to remove spark plugs to prevent galling the threads in the cylinder head.

Wear safety glasses. When you remove the ignition coils, it is common for dirt and debris to fall into the spark plug well. Use a can of compressed air to blow out the wells before removing the plugs so that no grit falls into the combustion chamber.

Pro Tips for Installing New Spark Plugs and Coils

Experienced technicians know that the “little things” make the difference between a repair that lasts 100,000 miles and one that fails in a week. When dealing with the 2017 ford explorer 3.5 firing order, precision is your best friend.

First, always check the spark plug gap before installation. Even “pre-gapped” plugs can be bumped during shipping, closing the gap. For the 2017 3.5L engine, the gap should typically be between 0.049 and 0.053 inches. Use a feeler gauge to verify this.

Second, consider the “while you’re in there” philosophy. Since you have to remove the intake manifold to reach the rear bank, it is wise to replace all six spark plugs and all six ignition coils at the same time. Replacing just one “bad” coil often leads to another one failing shortly after.

The Importance of Gaskets

When reassembling the intake, use a new set of intake manifold gaskets. These rubber rings flatten over time and lose their ability to seal. A $20 set of gaskets is cheap insurance against having to tear the whole top of the engine apart again to fix a vacuum leak.

Frequently Asked Questions About 2017 Ford Explorer 3.5 Firing Order

Does the 3.5L EcoBoost have a different firing order than the standard 3.5L?

No. Both the naturally aspirated 3.5L Ti-VCT and the twin-turbocharged 3.5L EcoBoost use the same firing order: 1-4-2-5-3-6. The engine blocks share the same basic architecture.

Which cylinder is Cylinder 1 on a 2017 Ford Explorer?

Cylinder 1 is located on the passenger side of the engine, in the rear bank (closest to the firewall). If you are standing at the passenger side fender looking at the engine, it is the cylinder furthest to your left in the back row.

Can I change the spark plugs without removing the intake manifold?

On the 2017 Explorer 3.5L, you can change the front three plugs (4, 5, 6) easily. However, the rear three (1, 2, 3) are physically blocked by the upper intake plenum. You must remove the plenum to access them safely.

What happens if I get the ignition coil wires mixed up?

If the wires are swapped, the spark will fire at the wrong time in the 2017 ford explorer 3.5 firing order. This will cause the engine to backfire, shake violently, and potentially trigger a “Limp Home” mode to protect the drivetrain.

Conclusion

Mastering the 2017 ford explorer 3.5 firing order is a rite of passage for any serious DIY mechanic working on the Ford platform. By understanding the 1-4-2-5-3-6 sequence and the physical layout of the cylinder banks, you take the guesswork out of engine diagnostics.

Remember to take your time, especially when dealing with the rear bank and the intake manifold. Use the right tools, double-check your spark plug gaps, and always prioritize safety by working on a cool engine. A little patience goes a long way in ensuring your Explorer remains a reliable companion for your daily commutes and off-road adventures.

Keep your tools clean, your gaskets fresh, and your firing order correct. Stay safe and stay confident behind the wheel!