Introduction
Spark plugs are small but extremely important. They ignite the air-fuel mixture in the engine, creating power for your car.
What Spark Plugs Do
Each spark plug sends an electrical spark into the engine cylinder. Without proper spark, the engine misfires or doesn’t start.
Types of Spark Plugs
- Copper – cheap but short life
- Platinum – long-lasting
- Iridium – best performance & longest lifespan
Symptoms of Bad Spark Plugs
- Hard starting
- Engine vibration (misfire)
- High fuel consumption
- Poor acceleration
- Rough idling
Replacement Interval
- Copper: 20,000–30,000 km
- Platinum: 60,000–80,000 km
- Iridium: 100,000+ km
Why Replacement Matters
Bad spark plugs reduce power, waste fuel, and can damage the catalytic converter if ignored.