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L1 Advanced Engine Performance — practice test

Studying for L1 (Advanced Engine Performance)? Overhaul Prep has 163 verified L1 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.

163L1 questions
100%with explanations
9,711questions in total
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Sample L1 questions

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

During a cranking relative-compression test using a current probe on the battery/starter cable, a weak (low-compression) cylinder is identified by:

  1. A higher current pulse for that cylinder
  2. An increase in cranking speed (RPM)
  3. A lower current pulse for that cylinder
  4. A longer crank time affecting all cylinders equally
WhyA cylinder with good compression resists the piston's upward travel, so the starter must draw more current on that stroke. A weak cylinder offers less resistance, producing a noticeably lower current hump.

Two technicians discuss crank/cam sensors. Technician A says a magnetic (variable-reluctance) crankshaft sensor produces an AC voltage whose amplitude rises with RPM. Technician B says a Hall-effect sensor produces a digital square-wave signal whose amplitude stays constant regardless of RPM. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyA variable-reluctance sensor's induced AC voltage increases with tooth speed, while a Hall-effect sensor switches a fixed-amplitude digital signal independent of speed. Both are correct.

A secondary ignition waveform shows one cylinder with a firing line far higher than the others and a shortened spark line. The MOST likely cause is:

  1. A fouled (shorted) spark plug on that cylinder
  2. An open or high-resistance secondary path (worn plug, wide gap, or bad wire) on that cylinder
  3. A rich mixture on that cylinder
  4. A leaking head gasket
WhyExcess firing voltage plus a short spark line means the spark is struggling against high resistance or an open in the secondary, such as a worn or wide-gapped plug or a bad wire/boot. A fouled plug would instead show a low firing line.

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