ASE A1 Engine Repair Practice Test
ASE A1 Engine Repair Practice Test
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Questions updated at Aug 24, 2026, 10:43 PM CDT
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Today's 10 ASE A1 Engine Repair questions
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Question 1 of 10
Objective Inspect camshaft drive gear-train components, including gears, chains, tensioners, guides, and belts; repair or replace as needed.
Cylinder Head and Valve Train Diagnosis and Repair (13%)
A timing belt has correct tooth alignment but tracks hard against one flange. The belt and tension are new. What should be inspected before returning the engine to service?
A belt that walks sideways despite correct timing indicates a pulley/alignment issue that can damage the belt and cause later timing failure. Choice A is correct because a belt that walks sideways despite correct timing indicates a pulley/alignment issue that can damage the belt and cause later timing failure. Choice B is not the best answer because excessive tension accelerates bearing/belt wear and does not correct misalignment. Choice C is not the best answer because tooth timing does not correct pulley plane alignment. Choice D is not the best answer because belt dressing is not an alignment repair and can damage modern belts.
Concept tested:
Question 2 of 10
Objective Visually inspect cylinder heads for cracks, warpage, corrosion, leakage, and passage condition; determine needed action.
Cylinder Head and Valve Train Diagnosis and Repair (13%)
After overheating, a cleaned aluminum cylinder head measures within flatness specification overall, but dye penetrant reveals a crack between a valve seat and coolant passage. What is the BEST decision?
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Concept tested:
Question 3 of 10
Objective Diagnose engine mechanical, electrical, electronic, fuel, and ignition problems with an oscilloscope, DMM, and/or scan tool; determine needed action.
General Engine Diagnosis (40%)
A direct-injection engine has one misfire. Injector command voltage is present, but the injector current waveform is outside the manufacturer’s known-good pattern and that cylinder also fails the manufacturer injector-balance test. Which conclusion is BEST?
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Concept tested:
Question 4 of 10
Objective Isolate engine noises and vibrations; determine needed action.
General Engine Diagnosis (40%)
A warm engine has a deep knock under light load. During a cylinder power-balance test, canceling cylinder 3 makes the knock substantially quieter; canceling the other cylinders has little effect. What is the BEST interpretation?
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Concept tested:
Question 5 of 10
Objective Inspect, test, reinstall, or replace thermostat, coolant bypass, and thermostat housing, including electronically controlled thermostats.
Lubrication and Cooling Systems Diagnosis and Repair (18%)
An electronically controlled thermostat receives the correct heater command, but its resistance is open and engine temperature exceeds the commanded control range. What is the BEST repair?
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Question 6 of 10
Objective Inspect, test, repair, and/or replace components of the ignition system.
Fuel, Electrical, Ignition, Air Induction, and Exhaust Systems Diagnosis and Service (20%)
After coil replacement, a misfire remains. The coil boot spring was not seated onto the spark-plug terminal and the secondary path arcs inside the well. What is the BEST correction?
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Question 7 of 10
Objective Inspect engine block for cracks, corrosion, passage condition, plug holes, warpage, finish, and condition; determine needed action.
Engine Block Diagnosis and Repair (9%)
A rebuilt engine shows no oil pressure during pre-lube even though the pump is primed, the pickup is sealed, and the crankshaft turns freely. The block has just returned from hot-tank cleaning. Inspection reveals an open threaded oil-gallery bore where a plug should be installed. What is the BEST action?
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Concept tested:
Question 8 of 10
Objective Inspect and replace engine water/coolant pump(s), including electric pumps.
Lubrication and Cooling Systems Diagnosis and Repair (18%)
An engine overheats at higher rpm but cools normally at lower rpm. Belt tension drops sharply as speed rises and the pump pulley slows relative to crank speed. What is the MOST likely cause?
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Question 9 of 10
Objective Diagnose engine problems caused by faults in the ignition system; determine needed action.
Fuel, Electrical, Ignition, Air Induction, and Exhaust Systems Diagnosis and Service (20%)
Two cylinders sharing one coil pack misfire, and secondary output is weak on both towers. Primary power/ground and command are correct. Plug wires and plugs test good. What is the MOST likely fault?
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Question 10 of 10
Objective Inspect piston oil-cooling nozzle/jets for damage, alignment, and restrictions; determine needed action.
Engine Block Diagnosis and Repair (9%)
A piston-cooling oil jet is slightly bent and now points away from the underside of the piston. Oil pressure is otherwise normal. What is the BEST action?
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ASE A1 ASE A1 Engine Repair
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Question 1 A timing belt has correct tooth alignment but tracks hard against one flange. The belt and tension are new. What should be inspected before returning the engine to service?
Answer choices
- A. Check tensioner/idler/water-pump pulley alignment and mounting for the cause of belt tracking.
- B. Increase belt tension above specification to keep it centered.
- C. Move the cam timing one tooth to change tracking.
- D. Apply belt dressing to the timing belt.
Correct answer
Check tensioner/idler/water-pump pulley alignment and mounting for the cause of belt tracking.
A belt that walks sideways despite correct timing indicates a pulley/alignment issue that can damage the belt and cause later timing failure. Choice A is correct because a belt that walks sideways despite correct timing indicates a pulley/alignment issue that can damage the belt and cause later timing failure. Choice B is not the best answer because excessive tension accelerates bearing/belt wear and does not correct misalignment. Choice C is not the best answer because tooth timing does not correct pulley plane alignment. Choice D is not the best answer because belt dressing is not an alignment repair and can damage modern belts.
Wrong-answer review
- B. Increase belt tension above specification to keep it centered.: Excessive tension accelerates bearing/belt wear and does not correct misalignment.
- C. Move the cam timing one tooth to change tracking.: Tooth timing does not correct pulley plane alignment.
- D. Apply belt dressing to the timing belt.: Belt dressing is not an alignment repair and can damage modern belts.
Extra learning features
Why candidates miss this
Over-tensioning may accelerate belt, pulley, or bearing wear and does not correct tracking geometry. With a new belt and specified tension, inspect pulley, tensioner, guide, and water-pump alignment/runout or mounting condition. Likely wrong answer: Increase belt tension above specification to keep it centered. Review focus: Gates Water Pump Installation Instructions
Why this matters
A belt that tracks against a flange is being forced sideways by alignment or component geometry. Correcting the source prevents edge wear, belt damage, and a repeat timing-drive failure instead of trying to hold the belt in place with excessive tension.
Question 2 After overheating, a cleaned aluminum cylinder head measures within flatness specification overall, but dye penetrant reveals a crack between a valve seat and coolant passage. What is the BEST decision?
Answer choices
- A. Reuse the head because warpage is within specification.
- B. Install a thicker head gasket to seal the crack.
- C. Treat the crack as a structural defect and follow the manufacturer-approved repair/replacement procedure rather than relying on flatness alone.
- D. Machine the deck until the crack is no longer visible.
Correct answer
Treat the crack as a structural defect and follow the manufacturer-approved repair/replacement procedure rather than relying on flatness alone.
Question 3 A direct-injection engine has one misfire. Injector command voltage is present, but the injector current waveform is outside the manufacturer’s known-good pattern and that cylinder also fails the manufacturer injector-balance test. Which conclusion is BEST?
Answer choices
- A. The injector has an internal electrical/mechanical fault despite receiving command and should be replaced per service procedure.
- B. Replace the PCM because it commands the injector.
- C. Perform a cylinder hone before replacing the injector.
- D. Replace the MAF sensor because fuel delivery is incorrect.
Correct answer
The injector has an internal electrical/mechanical fault despite receiving command and should be replaced per service procedure.
Question 4 A warm engine has a deep knock under light load. During a cylinder power-balance test, canceling cylinder 3 makes the knock substantially quieter; canceling the other cylinders has little effect. What is the BEST interpretation?
Answer choices
- A. The test localizes the noise toward a lower-end component associated with cylinder 3, such as a connecting-rod bearing or wrist pin; continue the specified lower-end diagnostic procedure before disassembly.
- B. Replace the cylinder 3 injector because canceling that cylinder changed the noise.
- C. Adjust the cylinder 3 valve lash because valvetrain noises are normally most affected by cylinder cancellation.
- D. Replace the cylinder 3 connecting-rod bearing immediately.
Correct answer
The test localizes the noise toward a lower-end component associated with cylinder 3, such as a connecting-rod bearing or wrist pin; continue the specified lower-end diagnostic procedure before disassembly.
Question 5 An electronically controlled thermostat receives the correct heater command, but its resistance is open and engine temperature exceeds the commanded control range. What is the BEST repair?
Answer choices
- A. Replace the coolant-temperature sensor because temperature is high.
- B. Install a conventional thermostat of any matching diameter.
- C. Replace the thermostat assembly/control element per service procedure and verify commanded temperature response.
- D. Increase fan speed permanently to mask the temperature rise.
Correct answer
Replace the thermostat assembly/control element per service procedure and verify commanded temperature response.
Question 6 After coil replacement, a misfire remains. The coil boot spring was not seated onto the spark-plug terminal and the secondary path arcs inside the well. What is the BEST correction?
Answer choices
- A. Increase coil dwell to jump the internal gap.
- B. Reinstall the boot/spring correctly, inspect for carbon tracking damage, replace damaged parts, and verify secondary ignition under load.
- C. Replace the injector because the misfire persisted after a coil replacement.
- D. Fill the plug well with dielectric grease.
Correct answer
Reinstall the boot/spring correctly, inspect for carbon tracking damage, replace damaged parts, and verify secondary ignition under load.
Question 7 A rebuilt engine shows no oil pressure during pre-lube even though the pump is primed, the pickup is sealed, and the crankshaft turns freely. The block has just returned from hot-tank cleaning. Inspection reveals an open threaded oil-gallery bore where a plug should be installed. What is the BEST action?
Answer choices
- A. Install the correct gallery plug using the specified sealant/depth procedure, then re-prime the lubrication system and verify pressure before starting the engine.
- B. Install a higher-volume oil pump to overcome the open gallery.
- C. Start the engine briefly so oil flow can seat the missing plug area.
- D. Increase oil viscosity until pressure appears.
Correct answer
Install the correct gallery plug using the specified sealant/depth procedure, then re-prime the lubrication system and verify pressure before starting the engine.
Question 8 An engine overheats at higher rpm but cools normally at lower rpm. Belt tension drops sharply as speed rises and the pump pulley slows relative to crank speed. What is the MOST likely cause?
Answer choices
- A. A worn or weak belt tensioner is allowing water-pump drive slip at higher speed.
- B. A thermostat stuck closed.
- C. A radiator cap with too high a rating.
- D. A failed coolant sensor.
Correct answer
A worn or weak belt tensioner is allowing water-pump drive slip at higher speed.
Question 9 Two cylinders sharing one coil pack misfire, and secondary output is weak on both towers. Primary power/ground and command are correct. Plug wires and plugs test good. What is the MOST likely fault?
Answer choices
- A. Both injectors failed at the same time.
- B. The shared coil pack has an internal high-voltage/output fault.
- C. The MAF sensor is dirty.
- D. The thermostat is stuck open.
Correct answer
The shared coil pack has an internal high-voltage/output fault.
Question 10 A piston-cooling oil jet is slightly bent and now points away from the underside of the piston. Oil pressure is otherwise normal. What is the BEST action?
Answer choices
- A. Increase engine oil pressure to compensate for the wrong aim.
- B. Bend it by eye until it looks close enough.
- C. Block the jet because the engine still has splash lubrication.
- D. Replace or correctly restore the oil jet per manufacturer procedure and verify the passage is unrestricted.
Correct answer
Replace or correctly restore the oil jet per manufacturer procedure and verify the passage is unrestricted.
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