ASE A1 Engine Repair Practice Test
1. A vehicle has white-colored exhaust emitting from its tailpipe at all engine speeds. Which of the following is causing this white-colored exhaust?
- A. Worn piston rings.
- B. A leaking head gasket.
- C. Worn valve seals.
- D. A leaking fuel injector.
2. A vacuum gauge is connected to a port on the intake manifold of an engine with poor performance. The needle on the gauge fluctuates between 15 "hg and 20 "hg vacuum at idle. This vacuum gauge reading indicates:
- A. Late ignition or valve timing.
- B. A normal condition.
- C. A sticking valve or misfire.
- D. A restricted exhaust system.
3. New crankshaft bearings are installed after the main bore of an engine block has been line bored. Which of the following is correct?
- A. Use oversized bearings.
- B. Align the oil hole in the bearing to the oil passage in the engine block.
- C. Worn main bearings result in high oil pressure.
- D. Both A and B.
4. A cylinder power balance test indicates two adjacent cylinders are underperforming. All of the following will cause this problem EXCEPT:
- A. A faulty fuel injector.
- B. Crossed ignition wires.
- C. A cracked cylinder head.
- D. A faulty head gasket.
5. Technician A says that insufficient hydraulic lifter preload results in excessive valve train noise. Technician B says excessive hydraulic lifter preload results in a high intake manifold vacuum. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
