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ASE Automobile

A1 Engine Repair — practice test

Studying for A1 (Engine Repair)? Overhaul Prep has 119 verified A1 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

119A1 questions
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9,711questions in total
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Sample A1 questions

Straight from the bank — answers highlighted, with the explanation underneath.

A cylinder shows low compression during a dry compression test. When a small amount of engine oil is added to the cylinder and the test is repeated, the compression reading increases substantially. This result most directly indicates:

  1. A leaking or burned intake valve
  2. Worn or broken piston rings
  3. A blown cylinder head gasket
  4. A cracked cylinder head
WhyAdding oil temporarily seals the piston rings, so a large rise on the wet test points to worn or broken rings. A leaking valve or head gasket cannot be sealed by oil, so those readings would stay low.

Two technicians are discussing valve stem-to-guide clearance. Technician A says exhaust valve guides are usually specified with slightly more stem-to-guide clearance than intake guides because exhaust valves run hotter and expand more. Technician B says excessive valve stem-to-guide clearance can cause oil consumption and blue exhaust smoke. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyBoth are correct: exhaust clearances (about 0.002-0.004 in) are typically greater than intake (about 0.001-0.003 in) to allow for heat expansion, and worn/excessive clearance lets oil be drawn down the guide, causing consumption and blue smoke.

A cylinder leakage (leak-down) test is performed with the cylinder held at TDC on the compression stroke. Air is heard escaping from the tailpipe. This is MOST likely caused by:

  1. worn piston rings
  2. a leaking or burned exhaust valve
  3. a leaking intake valve
  4. a blown head gasket
WhyAir escaping at the tailpipe points to a leaking exhaust valve. Air at the throttle body/intake indicates an intake valve, air from the oil filler or PCV indicates worn rings, and bubbles in the coolant indicate a head-gasket leak.

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