A8 Engine Performance Practice Test Graded A+
PCV System
What should happen when performing a PCV valve test? The valve should rattle when shaken back
and forth.
What is the purpose of the PCV valve test? To check if the valve is functioning properly.
What tool is used to perform the PC...
What should happen when performing a PCV valve test? 🚗 The valve should rattle when shaken back
and forth.
What is the purpose of the PCV valve test? 🚗 To check if the valve is functioning properly.
What tool is used to perform the PCV valve test? 🚗 A rattle test.
What happens when performing a snap-back test on a PCV valve? 🚗 The plunger snaps back when
pressed with the thumb.
What tool is used to check for crankcase vacuum at idle? 🚗 A water manometer.
Ignition Module
What could cause ignition module failure? 🚗 Loose module mounting screws.
What would not cause ignition module failure? 🚗 A fouled spark plug.
Fuel System
What would happen if the fuel return hose is partially restricted? 🚗 Fuel pressure would be higher than
normal, causing poor fuel economy without affecting drivability.
What would happen if the fuel regulator is stuck open? 🚗 Fuel pressure would be lower, possibly
causing a no-start condition, but not affecting fuel economy.
, EGR System
What is the purpose of the EGR system? 🚗 To lower combustion chamber temperature.
What would happen if the EGR system is inoperative? 🚗 The engine would run hotter, causing spark
knock and elevated oxides of nitrogen (NOx) readings.
Coil
What type of voltage does the ignition coil produce? 🚗 Three types: required voltage, available voltage,
and reserve voltage.
What could happen if there is not enough reserve voltage? 🚗 The engine would miss during
acceleration.
Diagnostic Procedure
What is the first step in any diagnostic procedure? 🚗 Verify the customer complaint.
Fuel Pressure
What would happen if low fuel pressure were present in all cylinders? 🚗 All cylinders would be
affected.
What could cause a multiple-cylinder misfire code? 🚗 Low fuel pressure, a leaking EGR valve, or a burnt
valve.
Gas Cap
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