ASE A8 Engine Performance Practice Test
1. An engine with a vacuum operated EGR system has fault code P0401, poor performance, and ping and detonation. A vacuum of 18"hg is applied to the EGR valve, the engine stumbles, and there is a significant drop in RPM. Which of the following is causing this condition? The engine has:
- A. A faulty EGR position sensor.
- B. A faulty EGR valve.
- C. A clogged EGR passage.
- D. A faulty EGR vacuum solenoid.
2. A cylinder power balance test indicates two adjacent cylinders are underperforming. All of the following would cause this result EXCEPT:
- A. Crossed ignition wires.
- B. A leaking head gasket.
- C. A faulty COP ignition coil.
- D. A cracked cylinder head.
3. An engine with a (COP) coil on plug ignition system cranks but will not start. A voltage meter measures 0.00 volts at each of the coil's (B+) power feeds. Which of the following is MOST likely causing this no start condition?
- A. n open in the primary circuit.
- B. The ECM's driver is faulty.
- C. Resistance in the secondary circuit.
- D. A faulty Engine Control Module.
4. Technician A says a faulty Heated-Wire (MAF) Mass Air Flow sensor affects fuel trim resulting in a loss of power and hesitation. Technician B says the MAF sensor's tip can become contaminated with deposits affecting its signal to the engine control module. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B