ASE A8 Engine Performance Practice Test

Test your knowledge of common auto engine performance issues with our free automotive service excellence ASE A-8 auto mechanic practice exam. Find a mechanic school near you.

Results

You passed! Correct answers are: 1. A only 2. B only 3. A only 4. both A and B 5. a broken valve spring 6. crankshaft position (CKP) sensor 7. low manifold vacuum 8. a disconnected spark plug wire 9. retarded ignition timing
Well, that's what the study guide is for... click the link below 🙂 Correct answers are: 1. A only 2. B only 3. A only 4. both A and B 5. a broken valve spring 6. crankshaft position (CKP) sensor 7. low manifold vacuum 8. a disconnected spark plug wire 9. retarded ignition timing

#1. An engine equipped with the ignition system shown misfires on cylinders #1 and #4. Technician A says that a failed ignition coil could be the cause. Technician B says that a weak rpm signal to the PCM could be the cause. Who is right?

the correct answer is A only

#2. While the engine is running, a technician pulls the PCV valve out of the valve cover and plugs the valve opening. There are no changes in engine operation. Technician A says that the PCV valve could be stuck in the open position. Technician B says that the hose between the intake manifold and the PCV valve could be plugged. Who is right?

the correct answer is B only

#3. Blue smoke comes from the exhaust pipe of a vehicle. Technician A says that blocked cylinder head oil return passages could be the cause. Technician B says that a stuck-open engine thermostat could be the cause. Who is right?

the correct answer is A only

#4. A vehicle is being diagnosed for poor fuel economy. Engine tests show a rich exhaust gas mixture. Technician A says that a failed oxygen (O2 ) sensor could be the cause. Technician B says that a failed engine coolant temperature sensor could be the cause. Who is right?

the correct answer is both A and B

#5. A vacuum gauge is connected to the intake manifold of an engine. With the engine running at 2,000 rpm, the pointer on the gauge fluctuates rapidly between 10 and 22 in.Hg. The cause could be:

the correct answer is a broken valve spring

#6. The technician finds no spark and no injector pulses on a vehicle that will not start. The cause could be a failed:

the correct answer is crankshaft position (CKP) sensor

#7. An engine with a return-type electronic fuel injection (EFI) system has high fuel pressure at idle. Which of these could be the cause?

the correct answer is low manifold vacuum

#8. Which of these could cause a catalytic converter to overheat?

the correct answer is a disconnected spark plug wire

#9. Engine detonation (knock) could be caused by any of these EXCEPT:

the correct answer is retarded ignition timing

finish

 

Next test: ASE A9 Diesel Mechanic Practice Test

Reference:

This is not an official test it is a practice test based on the official study guide. Use it for entertainment purposes only.