ASE A1 · Engine Repair
General Engine Diagnosis
Pinpointing engine problems before teardown: verifying the concern, telling mechanical faults from other systems, and running vacuum, power balance, compression and leak-down tests.
- Questions on the A1 test
- 18
- Share of the test
- 40%
- GearheadPass questions
- 50
- With exhibits
- 10
What this area covers
ASE's task list for General Engine Diagnosis on the A1 Engine Repair test groups into these tasks. Expect diagnosis-first questions: what's the most likely cause, what should be checked next, and which technician is right.
- Concern verification and service research
- Leak, noise and vibration diagnosis
- Oil/coolant use and exhaust smoke
- Vacuum and cylinder power balance tests
- Compression and leak-down testing
- PCV checks and scope/scan tool use
How to study it
- This area carries 18 of the A1 test's questions (40%). Give it study time in proportion.
- Work the free questions first, then read every explanation, including the ones you got right; the reasoning is what transfers to new questions.
- 1 of the 5 free questions here are Technician A/B items. Judge each statement on its own before you pick A only, B only, Both or Neither.
- 2 free questions use an exhibit. Read the exhibit's numbers before the answer options.
- Always confirm specifications in the vehicle manufacturer's service information. Test questions assume you would.
Free practice quiz
5 General Engine Diagnosis questions with explanations
All 50 General Engine Diagnosis questions are in the app
Plus a full-length A1 mock, flash cards, and English or Spanish on every question.
More A1 content areas
A1 · 6 questions on the test
Cylinder Head & Valve Train
Inspecting and repairing cylinder heads and valve trains: valves, seats, springs, guides, lifters, cams, timing drives and variable valve timing and lift parts.
A1 · 4 questions on the test
Engine Block
Engine removal and block-level work: measuring cylinders, crankshaft, bearings and rods, timing camshafts and balance shafts, and reassembling with the right seals.
A1 · 8 questions on the test
Lubrication & Cooling
Diagnosing and servicing oil and coolant systems: oil pressure and leak tests, pumps and coolers, oil changes, cooling system pressure tests, thermostats, water pumps, fans and belts.
A1 · 9 questions on the test
Fuel, Electrical, Ignition, Air Induction & Exhaust
Finding engine problems caused by outside systems, then testing and repairing fuel, air induction, electrical, ignition and exhaust components.