Windsor Firing Order

By Nick Marchenko, PhD

The 351 Windsor engine has a specific firing order: 1-3-7-2-6-5-4-8, ensuring efficient combustion in all cylinders. Different engines may have distinct firing orders, so it is vital to know your engine's correct order for peak performance.

Online resources can help, or consult a mechanic or your owner's manual if unsure. Correct firing order maintains smooth operation, efficiency, and component longevity. For 351 Windsor engine owners, knowing the right sequence is crucial for optimal performance.

Why is the firing order for the 351 Windsor important?

The firing order of the Ford 351 Windsor engine is closely tied to its camshaft configuration. The typical arrangement is 1-3-7-2-6-5-4-8. However, if you are unsure about the wiring or starting from scratch, the Ford 351 Windsor engine is an exceptional choice.

Whether you are powering a boat or a vehicle like the Grand Marquis, the 351 Windsor offers an impressive performance profile.

Changing spark plugs on this engine is relatively straightforward, and you can enhance the performance of this stock engine by staying informed about the latest advancements in the automotive world.

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Ford 351 Windsor firing order

Ensuring the correct spark plug firing order is vital for the proper performance of your Ford 351 Windsor engine. If the car ran smoothly before removing the plug wires, chances are they were in the right sequence.

It is a smart move to label them to avoid mix-ups during spark plug replacement. However, not all Ford 351 Windsor engines share the same firing order due to various modifications over the years.

Some may even have the 302 firing order instead of the 351. If the standard 1-3-7-2-6-5-4-8 firing order does not work for your Ford engine, you can try an alternative like 1-5-4-2-6 to see if it improves engine performance.

It is also essential to confirm that your engine is indeed a 351 Windsor, as certain vehicles, like 1970 Cougars, used the 351 Cleveland instead.

The 351 W engine can face challenges with high-performance cams, and converting it to the conventional 302 configuration might yield better results.

If your engine has a dual-plane carbureted manifold, be cautious as they are often set up for the 1-3-7 firing order. However, this is not an issue with a single-plane setup or an EFI intake.

Symptoms of an engine that needs a tune-up

Some vehicles may not reach the 100,000-mile mark on the odometer before needing a tune-up, while others can go much farther.

Therefore, understanding what signs to watch for concerning your 351 Windsor engine is crucial. Here are key symptoms that indicate it is time to replace the spark plugs in your 351 Windsor:

Engine misfiring

Failing spark plugs can lead to engine misfires, causing one or more cylinders to fire improperly. This can result in rough engine operation, vehicle shaking, and reduced fuel economy.

Engine stalling

Faulty spark plugs can cause the engine to stall abruptly, bringing it to a complete stop. This typically occurs when the spark plugs fail to ignite properly. In some instances, the engine may restart on its own, only to stall again shortly after.

Inability to start

The engine will not start if the spark plugs are not operating properly. Without spark plugs, the engine cannot function since they are essential for igniting the gasoline in the engine.

Reduced fuel mileage

One of the initial signs of deteriorating spark plugs is a decline in fuel efficiency. This occurs because the engine operates less efficiently, leading to increased fuel consumption over time.

Rough idling

Faulty spark plugs result in rough idling, characterized by engine vibrations and shaking during idle. Additionally, unusual noises may emanate from the engine.

Check engine light

When spark plugs fail to fire correctly, the check engine light activates. This warning illuminates because the vehicle's computer system detects irregular engine performance. Typically, the check engine light appears before other symptoms become noticeable.

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Replace your spark plugs

The good news is that replacing engine spark plugs is a straightforward task that you can do yourself with some basic tools. When comparing maintenance intervals, choosing the 100,000-mile spark plugs over the 30,000-mile ones is frequently more economical.

Step 1 focuses on safety

It is essential to take safety precautions before starting any auto repair job. Firstly, ensure the car is turned off and engage the parking brake.

Secondly, open the hood and disconnect the negative battery cable. This step prevents any accidental electrical shocks and allows the engine to cool down.

Step 2

Remove the spark plug wire. To begin, remove the spark plug wire from the spark plug. Simply pull on the boot (the rubber covering the spark plug wire), and it should come off easily. If it is stuck, gently use pliers to assist in removal.

Step 3

Extract the COP (coil on plug). The COP, responsible for providing the spark to the spark plug, needs to be unscrewed from the spark plug.

To achieve this, utilize a ratchet and a socket that fits the COP, typically 17 millimeters. After removing the COP, you can extract the spark plug from the engine.

Step 4

Replace or clean the spark plug. A wire brush can be used to clean a filthy spark plug. If it is broken, you should get a replacement.

Step 5

Reinstall the wires or COP and start the engine. After replacing the spark plugs, reattach the wires or COP. Start the engine after finishing this to ensure smooth operation.

The Ford 351 Windsor features a unique firing order compared to other V8 engines

1-3-7-2-6-5-4-8, as defined by Ford. It is important to recognize that the cylinder numbering does not follow a consecutive order from the front left.

Cylinders four and eight are located on the front right side of the engine. On the back left side, you will find cylinders three and seven, and the back right houses cylinders two and six.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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