Spark Plug Quiz

What is the purpose of a spark plug?

• To measure the temperature inside the engine

• To ground the engine to the car's chassis

• To ignite the air fuel mixture in the combustion chamber

• To provide high voltage current to the engine

What does a worn spark plug indicate?

• Overheating of the engine

• Problems with the engine

• Misfire issues

• Normal wear and tear

What can cause an oil fouled spark plug?

• Clogged air filter

• Overfilling the engine with oil

• Worn piston rings

• Leaking fuel injector

What does a spark plug with white deposits indicate?

• Burning oil

• Normal wear and tear

• Running rich

• Running lean

What can cause a carbon fouled spark plug?

• Clogged air filter

• Wrong heat range spark plug

• Running rich

• Leaking fuel injector

What does a spark plug with light gray or white insulation indicate?

• High combustion temperatures

• Running lean

• Normal wear and tear

• Overheating of the engine

What can cause high combustion temperatures and running lean?

• Advanced timing

• Leaking fuel injector

• Clogged air filter

• Wrong heat range spark plug

What can happen if engine knock and detonation are left untreated?

• Reduced emissions

• Major engine damage

• Improved engine performance

• Increased fuel efficiency

What should you do if you find a physically damaged spark plug?

• Clean it and reinstall it

• Get it checked out and fix the underlying problem

• Ignore it and continue driving

• Replace it with a new spark plug

What is the recommended maintenance for spark plugs?

• Follow the manufacturer's guidelines

• Clean them every 5,000 miles

• Replace them every 10,000 miles

• Replace them every 50,000 miles