How Often Should You Replace Spark Plugs?

Spark plugs are small but essential components of a car’s engine. Without them, your car simply won’t start. Whether you're driving a compact sedan or a powerful V8 truck, functioning spark plugs ensure smooth ignition, better fuel efficiency, and optimal engine performance.

What Is a Spark Plug?

A spark plug is a small device installed in each engine cylinder. It delivers high-voltage sparks from the ignition system to ignite the air-fuel mixture. Most cars have one spark plug per cylinder, and some high-performance engines have two.

Why Spark Plugs Are Important

The spark plug generates a spark that ignites the compressed air-fuel mixture, powering the engine. Failing spark plugs can disrupt this ignition process, resulting in performance issues.

Symptoms of Bad Spark Plugs

• Engine is hard to start
• Rough idling or engine noise
• Decreased fuel efficiency
• Engine misfires or knocking
• Poor acceleration

How Often Should You Replace Spark Plugs?

There’s no one-size-fits-all answer, but general guidelines include:

• Copper spark plugs: Replace every 20,000–30,000 miles
• Platinum/Iridium spark plugs: Replace every 60,000–100,000 miles

Always consult your vehicle’s manual or mechanic for the best interval.

How to Replace Spark Plugs

Replacing spark plugs is a task many DIYers can do at home. Here’s what you’ll need:

• Spark plug socket and wrench
• Torque wrench
• Spark plug gap tool
• Optional: Anti-seize lubricant

Basic steps:

1. Let the engine cool completely.
2. Remove the ignition coil or wire.
3. Unscrew the old spark plug.
4. Check and adjust the spark plug gap if needed.
5. Install the new spark plug and reconnect the wire/coil.

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