Why this guide
- Built from the official ASE 2025 Automobile Study Guide task list — not generic engine repair notes
- Weighted by the real exam percentages so you spend time where the questions actually are
- Technician A/B and measurement interpretation practice — the two formats that cause most first-time misses
- Print-ready pack: full guide plus two 1-page cheat sheets and a 1-page pocket card for the shop
Who this is for
- Automotive technicians certifying in engine repair at dealerships or independent shops
- Shop foremen and lead techs preparing apprentices for ASE A1
- Automotive students in post-secondary or trade-school programs
- Mobile mechanics and fleet technicians needing ASE credentials
- Experienced techs recertifying A1 with the latest task list
What you'll learn
- General Engine Diagnosis (30%): verify customer concern, road test, no-crank/no-start diagnosis, engine noise/vibration isolation, oil/coolant/exhaust consumption, manifold vacuum/pressure tests, cylinder power balance, cranking/running compression, leak-down, PCV inspection, scan-tool/DMM/oscilloscope diagnosis
- Cylinder Head and Valve Train Diagnosis and Repair (20%): cylinder head removal/inspection, valve/seat/spring inspection, valve guide clearance, installed stem height, pushrod/rocker/lifter service, camshaft drive gear train, timing, VVT/VVL components, head gasket installation, thread repair
- Engine Block Diagnosis and Repair (20%): block disassembly/inspection, cylinder bore measurement, crankshaft journal inspection and endplay, main/rod bearings and clearance, piston/pin/ring inspection and installation, flywheel/flexplate service, oil pan/cover replacement, engine assembly and priming
- Lubrication and Cooling Systems Diagnosis and Repair (16%): oil pressure/leak tests, oil pump inspection, oil cooler service, oil/filter changes, cooling system pressure/leak tests, radiator/heater core/thermostat/water pump service, coolant testing/flushing, fan/drive-belt inspection
- Fuel, Electrical, Ignition, and Exhaust Systems Inspection and Service (14%): fuel-system diagnosis and component repair, air-induction system inspection, electrical-system diagnosis and repair, ignition-system diagnosis and repair, exhaust-system diagnosis and repair
What you're getting
- 6 printable PDFs: cover, course notice, full study guide, two condensed cheat sheets, and an exam-day pocket card.
- Content built from the public syllabus and real test-taker accounts.
- No fake "actual exam" content — honest, source-cited study aids.
"General Engine Diagnosis is the heaviest section at 30%; interpreting compression and leak-down results trips up a lot of people."
— paraphrased from public test-taker accounts