Ignition diagnosis Quiz

Which of the following is a common symptom of a faulty ignition system?

• Failure to start, misfires, poor performance, erratic running.

• Good fuel economy.

• Smooth idling.

• Increased engine power.

A misfire can be caused by:

• Faulty spark plugs, ignition leads, coil, or other ignition components.

• A properly functioning ignition system.

• A full fuel tank.

• A new air filter.

"Pinking" or engine knock can be a symptom of:

• Incorrect ignition timing (too advanced).

• Correct ignition timing.

• A rich air/fuel mixture.

• A lean air/fuel mixture.

Failure to start (hot or cold) can be due to:

• A faulty ignition switch, battery, coil, or other ignition components.

• A properly functioning ignition system.

• A full fuel tank.

• A new air filter.

Erratic running can be caused by:

• Intermittent faults in the ignition system, such as loose connections or faulty sensors.

• A properly functioning ignition system.

• A full fuel tank.

• A new air filter.

When inspecting an ignition system, what should you check?

• Spark plugs (condition, gap), ignition leads (condition, resistance), coil (output), distributor cap (if applicable), and connections.

• Fuel injectors, fuel pump, fuel filter.

• Air filter, intake manifold, throttle body.

• Exhaust pipe, catalytic converter, muffler.

How do you typically check the spark plug gap?

• With a feeler gauge.

• With a micrometer.

• With a ruler.

• By visual inspection only.

What can a visual inspection of spark plugs tell you?

• The condition of the engine, such as whether it's running too rich or too lean, or if there are other issues.

• The fuel pressure.

• The air flow.

• The exhaust gas composition.

How can you test the ignition coil output?

• With a spark tester.

• With a multimeter (for resistance).

• By visual inspection only.

• By listening for a spark.

When inspecting ignition leads, what should you look for?

• Cracks, damage, and secure connections.

• Correct spark plug gap.

• Cleanliness of the distributor cap.

• Proper fuel injector operation.