ASE G1 Maintenance & Lt. Repair Practice Test
11. A FWD vehicle has four new tires installed. The left front wheel has a growling sound that increases with vehicle speed. Which of the following is MOST likely causing this condition?
- A. A cupped tire tread.
- B. A feather tire tread.
- C. A worn CV-joint.
- D. A faulty wheel bearing.
Answer A is wrong. When the tire is scalloped or cupped across the tread, it makes a growling sound that increases with vehicle speed. It is usually caused by bad shocks or out-of-balance tires. This vehicle has four new tires.
Answer B is wrong. Typically, when a tire is feathered across its tread, the tie rods are loose, or the vehicle needs to be aligned. The ball studs get loose in their sockets, allowing the tires to toe in/out as the vehicle travels down the road.
Answer C is wrong. A worn CV joint clicks while cornering.
Answer D is correct. A bad wheel bearing results in a growl that increases with vehicle speed; it makes more noise while turning around a corner than a scalloped or cupped tire. If a sealed wheel bearing is noisy or defective, grasp the tire at the top and bottom and rock it back and forth. Looseness indicates a bad bearing.
12. A vehicle pulls to the left only while braking. Which of the following is causing this pull?
- A. A restricted left front brake line.
- B. A frozen right front caliper.
- C. Both A and B
- D. Neither A or B
Answer A is wrong. A restricted left front brake line causes the vehicle to pull to the right when braking. It pulls to the left because the left front brake unit has more stopping power than the right.
Answer B is correct. A frozen right front caliper causes the vehicle to pull to the left when braking. It's pulling because the left brake unit has more clamping force than the right or opposite brake unit.
Answer C is wrong. Answer B is correct.
Answer D is wrong. If the vehicle pulls to the left only while braking, suspect a problem with the front right side brake unit.
13. A vehicle's air conditioner blows warm air at stop lights. It returns to normal at cruising speeds. All of the following will result in this condition EXCEPT:
- A. A faulty fan clutch.
- B. A weak electric cooling fan motor.
- C. A weak blower motor.
- D. Debris on the condenser fins.
Answer A is wrong. Fans provide airflow while the vehicle is at rest. Airflow through the condenser is vital for automotive air conditioning performance.
Answer B is wrong. While the vehicle accelerates and travels forward, ram air passes through the condenser. While at a stop, the weak fan motor is not pulling enough air through, resulting in a loss of heat transfer.
Answer C is correct. This is an EXCEPT type question. A faulty blower motor or blower motor resister affects the air volume at the passenger's compartment interior vents.
Answer D is wrong. Debris on the condenser's fins reduces airflow and its ability to transfer heat.
14. A technician runs a scan and receives a fault code indicating a problem in the MAF sensor circuit. Technician A says this could be caused by a loose connector. Technician B says this could be caused by a faulty MAF sensor. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. There could be a problem with the MAF sensor. MAF sensors, particularly hot wire sensors, sometimes require cleaning to restore operation.
Answer B is wrong. An intermittent circuit causes the MAF sensor to perform one minute and fail the next. Inspect this connection and component to ensure a loose connector or faulty wire isn't at fault.
Answer C is correct. Both technicians are correct.
Answer D is wrong. Perform a wiggle test on any circuit where a loose connector or a broken wire is suspected.
15. An engine emits blue-gray exhaust from its tailpipe only when it's first started. The exhaust smoke goes away after the engine has run for a few minutes. Which of the following is MOST likely causing this blue-gray exhaust?
- A. A blown head gasket.
- B. A leaking intake manifold.
- C. A leaking fuel injector.
- D. Leaking valve seals.
Answer A is wrong. A faulty head gasket results in coolant entering and burning in the combustion chamber; this results in white-colored exhaust.
Answer B is wrong. A leaking intake manifold produces a vacuum leak and a lean air-fuel ratio.
Answer C is wrong. A leaking fuel injector produces a rich air-fuel ratio and black-colored exhaust emitting from the tailpipe.
Answer D is correct. A leaking valve seal causes oil to leak into the combustion chamber over time, usually overnight, resulting in blue-gray exhaust at first start.