Gas Engine Tune-Up Quiz

Gas Engine Tune-Up Test

• Question 1: What is the primary purpose of a gas engine tune-up?

  • Optimizing engine performance and efficiency
  • Improving fuel economy
  • Reducing emissions
  • Maintaining optimal engine life
  • Correcting potential problems

• Question 2: List at least four key components typically included in a gas engine tune-up.

  • Air filter
  • Spark plugs
  • Carburetor or fuel injectors (depending on the engine type)
  • Ignition system (wires, distributor, etc.)
  • Valve clearance (in older engines)

• Question 3: Describe the function of an air filter in a gas engine.

  • Prevents dirt and debris from entering the engine's cylinders, ensuring proper air intake for combustion.
  • Improves engine performance.
  • Extends engine life by preventing damage from contaminants.

• Question 4: Explain the importance of checking and replacing spark plugs during a tune-up.

  • Ensures proper ignition of the fuel-air mixture.
  • Prevents misfires and rough idling.
  • Improves fuel economy and power output.
  • Improves cold start performance.

• Question 5: What are symptoms of a faulty spark plug?

  • Rough idling or misfiring
  • Poor acceleration
  • Low fuel mileage
  • Difficulty starting.

• Question 6: How often should spark plugs be replaced?

  • Depends on the type of vehicle and driving habits
  • Usually every 30,000 to 100,000 miles, or as recommended by the vehicle's maintenance schedule.

• Question 7: A customer brings in a car with a rough idle, and the mechanic suspects the air filter has low performance. How should the mechanic test the air filter condition?

  • Visually inspect the filter for excessive dirt or damage.
  • Physically feel the filter for excessive obstruction (using hand to feel for airflow restriction - should be relatively easy to move air through a clean filter).

• Question 8: What tools are commonly used during a tune-up procedure?

  • Screwdrivers, wrenches, socket sets
  • Spark plug socket and wrench set
  • Gauge tools (for measuring valve clearance, compression, etc.)
  • Air filter replacement tools (depending on the filter type)

• Question 9: Explain the process of replacing a spark plug.

  • Gather tools and appropriate spark plugs for engine type
  • Properly disconnect the battery to prevent electrical problems
  • Remove the old spark plug using a spark plug socket and wrench
  • Inspect the plug's condition using a file or other tool for proper cleaning
  • Install the new spark plug, ensuring a proper seal.
  • Tighten to the recommended torque setting specified by vehicle manufacturer.

• Question 10: What are some safety precautions to take when working on a gas engine?

  • Wear appropriate safety glasses, gloves, and long sleeves
  • Ensure the engine is turned off and the ignition is disconnected.
  • Use appropriate precautions with tools and potentially dangerous items within the engine.

Answer Key

• Question 1: Optimizing engine performance and efficiency, improving fuel economy, reducing emissions, maintaining optimal engine life, correcting potential problems

• Question 2: Air filter, spark plugs, carburetor or fuel injectors, ignition system (wires, distributor, etc.), valve clearance (older engines)

• Question 3: Prevents dirt and debris from entering cylinders, improves engine performance, and extends engine life.

• Question 4: Ensures proper ignition of the fuel-air mixture, reduces misfires, improves fuel economy and power output, and improves cold start performance.

• Question 5: Rough idling/misfiring, poor acceleration, low fuel mileage, difficulty starting.

• Question 6: Depends on the vehicle type and driving habits, typically every 30,000-100,000 miles or by vehicle manufacturer guidelines.

• Question 7: Visually inspect the air filter, physically feel the filter for airflow restriction.

• Question 8: Screwdrivers, wrenches, socket sets, spark plug socket/wrench, gauge tools (for relevant measurements) and air filter replacement tools.

• Question 9: Detailed steps of removing and installing a new spark plug (from above).

• Question 10: Wear safety gear (glasses, gloves, long sleeves). Ensure the engine is off and the ignition is disconnected, and employ use of appropriate precautions.

Additional Notes

• Understanding specific engine types (e.g., 4-stroke, 2-stroke) and their respective tune-up requirements can considerably enhance understanding.
• Always refer to the vehicle's repair manual for accurate guidelines and specifications.
• Following manufacturer's recommendations for specific procedures is extremely important.