ASE G1 Maintenance & Lt. Repair Practice Test

11. A vehicle's right front wheel has a growling noise that increases with vehicle speed. The MOST likely cause is:

  • A. Excessive rotor lateral run out.
  • B. Warped rear brake drums.
  • C. A worn CV-joint.
  • D. A worn wheel bearing.

11.

Answer A is wrong. Excessive lateral rotor run-out will result in pulsation felt in the steering wheel (front rotors) or the driver's seat (rear rotors).

Answer B is wrong. A warped brake drum is similar to a warped rotor, causing a pulsation felt in the brake pedal or a pulsating vibration in the driver's seat only when the brakes are applied.

Answer C is wrong. A worn CV joint will produce a clacking noise while cornering.

Answer D is correct. A worn out wheel bearing will cause a growl that increases with vehicle speed.

12. A vehicle pulls to the left only while braking. Technician A says this could be a restricted left front brake line. Technician B says this could be a frozen right front caliper. Who is correct?

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

12.

Answer A is wrong. A restricted left front brake line will cause the vehicle to pull to the right when braking. This is because the right front brake unit has more stopping power.

Answer B is correct. A frozen right front caliper will cause the vehicle to pull to the left when braking.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

13. A vehicle's air conditioner blows cold air while driving at normal speeds, but warm while sitting at stop lights. The LEAST likely cause of this condition is:

  • A. An overheating engine.
  • B. A weak electric fan motor.
  • C. A frozen expansion valve.
  • D. Debris in the condenser fins.

13.

Answer A is wrong. Excessive engine heat affects the condenser's ability to transfer heat.

Answer B is wrong. While the vehicle is moving, ram air is passing 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 a least likely type question. Once the expansion valve freezes, the air conditioner would have poor performance at all speeds.

Answer D is wrong. Debris on the condenser's fins reduces it's ability to transfer heat. This is even more pronounced when the vehicle is at rest.

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 wire or an intermittent open. 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

14.

Answer A is wrong. An intermittent circuit causes the MAF sensor to perform one minute and fail the next.

Answer B is wrong. There could be a problem with the MAF sensor as well. Further inspection and diagnosis will be required. MAF sensors, hot wire sensors in particular, sometimes require a cleaning to restore operation.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

15. A vehicle blows blue gray exhaust from its tailpipe only when first started in the morning. The MOST likely cause of this condition is:

  • A. Worn piston rings.
  • B. A lean fuel condition.
  • C. A leaking fuel injector.
  • D. Leaking valve seals.

15.

Answer A is wrong. Worn piston rings cause a vehicle to emit blue gray exhaust long after it first starts. Valve seals leak overnight and result in blue gray exhaust smoke after the vehicle has sit for a while. If not severe, this smoke will usually begin to clear up after the engine has run for a while.

Answer B is wrong. A lean fuel condition will cause misfires resulting in high levels of hydrocarbon or HC's.

Answer C is wrong. A leaking fuel injector will result in a rich fuel condition and black exhaust emitting from the tailpipe.

Answer D is correct. A leaking valve seal will cause oil to leak into the cylinder's chamber over time, usually overnight, resulting in blue gray exhaust at first start.