What size spark plugs are in a Ford Fiesta?

The spark plugs in a Ford Fiesta typically have a size of 0.028 to 0.031 inches (0.71 to 0.79 mm) gap. This is the standard spark plug gap for most Ford Fiesta models, though the exact size may vary slightly depending on the year, engine, and other factors.

Understanding Spark Plug Sizes in Ford Fiestas

Spark plugs are a critical component in the ignition system of a Ford Fiesta, responsible for providing the electrical spark that ignites the air-fuel mixture in the engine's cylinders. The size of the spark plug gap, which is the distance between the center electrode and the ground electrode, plays a crucial role in the engine's performance and efficiency.

The recommended spark plug gap for a Ford Fiesta can typically be found in the owner's manual or service documentation for the specific model and year. However, as a general guideline, the spark plug gap for most Ford Fiesta models falls within the range of 0.028 to 0.031 inches (0.71 to 0.79 mm).

Factors Affecting Spark Plug Size

Several factors can influence the recommended spark plug size for a Ford Fiesta, including:

• Engine Type: Different engine configurations, such as naturally aspirated or turbocharged, may require slightly different spark plug gap sizes.


• Model Year: Spark plug gap specifications may vary between different model years of the Ford Fiesta, so it's important to refer to the correct documentation for your vehicle.


• Driving Conditions: Factors like driving style, climate, and engine load can affect the optimal spark plug gap over time, requiring periodic adjustments.

It's essential to use the correct spark plug size for your Ford Fiesta to ensure optimal engine performance, fuel efficiency, and emissions compliance. Consult your owner's manual or a qualified mechanic if you're unsure about the appropriate spark plug size for your vehicle.

What size socket is a Ford spark plug?

For the majority of plugs, you need a 5/8” or 16mm socket. Some Fords use 9/16″ plugs, some newer European and Asian vehicles use 14mm plugs, and there are a few applications that use 7/8″, 13/16″, ¾” or 18mm plugs. All spark plugs are 6 sided, except some BMW engines.

How do I know my spark plug size?

To measure spark plug sizes and dimensions, you'll need to consider several factors: Thread Size: This is the diameter of the spark plug's threads. You can measure this with a caliper. The most common thread sizes are 10mm, 12mm, 14mm, and 18mm.

What size spark plug socket for Ford Fiesta?

Use the spark plug socket #16. Use a ratchet wrench. Be careful to avoid damaging spark plug wires. Remember the sequence of the spark plug wires connectors.

How often should I change the spark plugs on my Ford Fiesta?

AI Overview Spark plugs for a Ford Fiesta should be replaced every 30,000 miles, or as recommended in your owner's manual. The exact interval depends on the type of spark plug and your vehicle's model.  Spark plug types 

• Conventional copper spark plugs: Should be replaced every 20,000 to 30,000 miles
• Platinum spark plugs: May last up to 60,000 miles or more
• Iridium spark plugs: May last up to 100,000 miles or more

Signs of bad spark plugs 

• Poor fuel economy
• Engine misfiring
• Engine idles roughly
• Car doesn't accelerate easily
• Engine is loud
• "Check Engine" light comes on
• Trouble starting
• Engine surging
• Lack of acceleration

You can also watch this video to learn more about when to replace your spark plugs:18sMercie J Auto Care, llcYouTube · Jun 6, 2023Generative AI is experimental. Learn more

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What size socket extension for spark plugs?

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What size is a Ford Fiesta spark plug?

NGK 97576 Spark plug for FORD FIESTA M12 x 1,25, Spanner Size: 14 mm.