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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A1 Fuel, ignition, air and exhaust: practice questions

Our ASE A1–A8 bank has 9 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A1 Engine Repair

A weak ignition coil on one cylinder most often causes what?

  1. Blue exhaust smoke
  2. A misfire under load on that cylinder
  3. Low oil pressure
  4. Low compression on that cylinder, worse when hot
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B. A misfire under load on that cylinder — Swapping the coil to another cylinder and seeing if the misfire moves helps confirm it.

Question 2 · A1 Engine Repair

An intake manifold gasket leaks coolant into the intake. What could result?

  1. Coolant loss, white smoke and possible oil contamination
  2. A rich black exhaust and fouled plugs on every cylinder
  3. Higher fuel economy
  4. Brake fade
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A. Coolant loss, white smoke and possible oil contamination — Some intake gaskets seal coolant passages.

Question 3 · A1 Engine Repair

What is the main effect of a clogged engine air filter on a modern fuel-injected engine?

  1. Reduced power at high load
  2. Low oil pressure
  3. A rich misfire at idle
  4. Black smoke at idle in every case
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A. Reduced power at high load — The engine computer meters fuel to measured airflow, so the mixture usually stays near correct.

Question 4 · A1 Engine Repair

A turbocharger is losing oil into the intake. What symptom is likely?

  1. Blue smoke and oil in the intercooler piping
  2. A no-start
  3. Overheating
  4. Black smoke only, with no oil consumption at all
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A. Blue smoke and oil in the intercooler piping — Worn turbo seals or a restricted oil drain are common causes.

Question 5 · A1 Engine Repair

A fouled spark plug has wet, black, oily deposits. What does this suggest?

  1. A lean mixture
  2. Oil entering that cylinder
  3. Too-hot spark plug heat range
  4. Correct operation
Show the answer

B. Oil entering that cylinder — Check rings, valve seals and guides.

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