ASE G1 Maintenance and Lt. Repair Practice Test

21. White colored exhaust is billowing from the tailpipe of a vehicle. Which of the following is correct?

  • A. It has worn piston rings.
  • B. It has a leaking head gasket.
  • C. It has worn valve seals.
  • D. It has a leaking fuel injector.


Answer A is wrong. Worn piston rings result in blow-by and oil burning in the combustion chamber producing blue/gray exhaust.

Answer B is correct. A leaking head gasket results in a coolant leak from the jacket into the cylinder producing white/gray exhaust.

Answer C is wrong. Leaking valve seals result in oil entering the combustion chamber, especially overnight or after sitting a while. At start up the engine will produce blue/gray exhaust from this oil burning in the combustion chamber. This symptom may go away after the engine runs a while, but return again after the vehicle sits.

Answer D is wrong. A leaking fuel injector results in a rich condition producing excessive hydrocarbons and black exhaust.

22. An automatic transmission's fluid is pink and milky. Technician A says this is caused by engine overheating. Technician B says the transmission could have been overfilled and the fluid has become aerated. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


Answer A is wrong. Transmission coolers are found in the radiator and cooled by the engine's cooling system. Engine overheating can result in black or dark brown colored transmission fluid.

Answer B is wrong. Overfilling the transmission alters transmission system pressures, causes aeration, and can result in fluid escaping from the vent.

Answer C is wrong. Neither technician is correct. Transmission fluid turns pink and milky when it's mixed with coolant in the radiator. The radiator contains an internal transmission cooler that cools the transmission fluid with coolant after it has been cooled by the radiator.

Answer D is correct. Neither technician is correct, the ATF is contaminated with coolant.

23. Technician A says fuel filters have an arrow that always points toward the fuel tank. Technician B says a clogged fuel filter will reduce fuel pressure at the fuel rail. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


Answer A is wrong. The ASE G1 Maintenance and light repair test has questions regarding maintenance of the engine, transmission, and other automotive systems. The fuel system’s fuel filter is replaced at recommended intervals because it can become clogged restricting the flow of fuel to the fuel rail. The arrow on the filter points in the direction of flow, toward the engine.

Answer B is correct. A clogged fuel filter reduces pressure at the fuel rail and injectors. This will result in a lean fuel condition.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

Illustration of tire wear.

24. Which of the following is true about the tire in the illustration?

  • A. It is underinflated.
  • B. It is overinflated.
  • C. There is too much camber.
  • D. The coil spring on that wheel is weak.


Answer A is wrong. An underinflated tire will show premature wear on its shoulders.

Answer B is correct. Overinflating a tire wears the center of its tread.

Answer C is wrong. Too much camber wears either the inner or the outer tread of the tire. Camber is the inward or outward tilt of the top of the tire viewed from the front of the vehicle.

Answer D is wrong. Weak coil springs cause tire cupping. A cupped or scalloped tire makes a growling sound that increases with vehicle speed. Be careful, it can be difficult to distinguish between a cupped tire and a faulty wheel bearing.

25. A vehicle with power assist brakes has a hard brake pedal with little stopping power. Which of these is the MOST likely cause of this condition?

  • A. The brake booster.
  • B. The master cylinder.
  • C. Air in the system.
  • D. Contaminated brake fluid.


Answer A is correct. A faulty brake booster will result in a hard brake pedal.

Answer B is wrong. A faulty master cylinder typically results in a spongy pedal that drifts to the floor after application.

Answer C is wrong. Air in the system results in a spongy brake pedal.

Answer D is wrong. Contaminated brake fluid damages rubber seals and results in a soft spongy brake pedal.