Engine Performance and Driveability Quiz

What is the first step in diagnosing a no-start problem?

• Check engine compression

• Check for vacuum leaks

• Check for fuel pressure

• Check for strong spark

What does a vacuum gauge measure?

• Turbocharger boost pressure

• Positive air pressure

• Negative air pressure

• Exhaust system back pressure

What is the primary cause of a lack of engine power or sluggish engine?

• Fuel system problems

• Ignition system problems

• Emission control system problems

• Engine mechanical problems

What is the purpose of a technical service bulletin (TSB)?

• Explain problems that frequently occur in one make or model vehicle

• List common engine performance problems

• Provide information on trade magazines

• Explain how to use a scan tool

What is the cause of a hard starting problem?

• Fouled spark plugs

• Vacuum leak

• Worn timing chain

• Battery depletion

What does a misfire code indicate in OBD II cylinder misfire monitoring?

• Problem in one cylinder

• Catalytic converter damage

• Increase in emissions

• Problem occurring in all cylinders

What is the cause of a backfiring problem?

• Defective ignition coil

• Exhaust system leakage

• Incorrect ignition timing

• Faulty air injection system

What is the purpose of a scan tool in diagnosing engine performance problems?

• Check for vacuum leaks

• Check ECM for stored trouble codes

• Check for strong spark

• Check for fuel pressure

What is the cause of a rough idle problem?

• Lean air-fuel mixture

• Dead cylinder

• Vacuum leak

• Fouled spark plugs

What is the cause of a hesitation problem?

• Throttle position sensor failure

• Slow oxygen sensors

• Temporarily lean air-fuel mixture

• Engine temperature sensor failure