ASE A8: Engine Performance Certification Exam Practice Test
Build your confidence for ASE A8: Engine Performance Certification Exam. Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
ASE A8 examination covering ignition, fuel/air induction, emissions control, computer controls, and engine diagnosis for automotive technicians. Administered by ASE as a linear (computer-based) format exam. Key domains include Computerized Engine Controls Diagnosis and Repair, General Diagnosis, Fuel, Air Induction and Exhaust Systems Diagnosis and Repair and Emissions Control Systems Diagnosis and Repair. The exam consists of 50 questions over 75 minutes.
Sample Questions
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A 3.5L V6 has a single-cylinder misfire that is worst hot at idle. Scan-tool data and basic checks show relative compression flags cylinder 5 low; leak-down is 34 percent with air heard at the tailpipe. The technician also verifies fuel pressure and injector balance are normal. What is the best diagnosis or next test?
A late-model gasoline vehicle has strict catalyst monitor thresholds. Scan-tool data and basic checks show a small exhaust leak upstream of the downstream O2 sensor appears only when cold. The technician also verifies P0420 sets after cold-weather trips. What is the best diagnosis or next test?
A direct-injected engine has long crank and rail pressure slow to build. Scan-tool data and basic checks show low-side pressure is normal but high-side pressure remains far below command during cranking. The technician also verifies the high-pressure pump command is high. What is the best diagnosis or next test?
A plug-in hybrid has stale-fuel maintenance engine starts. Scan-tool data and basic checks show the engine runs even with sufficient battery charge and no engine DTCs. The technician also verifies scan data shows fuel maintenance mode active. What is the best diagnosis or next test?
A diesel displays an SCR efficiency warning. Scan-tool data and basic checks show NOx remains high downstream of the SCR catalyst and DEF quality measures below specification. The technician also verifies exhaust temperature reaches dosing enable criteria. What is the best diagnosis or next test?
Career Opportunities & Salary
Exam insights and study advice
Engine performance is the cornerstone of vehicle operation, affecting drivability, fuel economy, safety, and environmental compliance. A technician certified in A8 can accurately diagnose intermittent drivability issues, solve complex check engine light problems, and ensure vehicles meet stringent emission standards. This directly translates to reduced diagnostic time, increased first-time repair rates, higher customer satisfaction, and the technical capability to service the increasingly computerized vehicle fleet. In a practical sense, this certification signifies the ability to fix the vehicle correctly, which protects the shop's reputation and the customer's investment.
Recommended
These are the backgrounds the certifying body suggests. Check the vendor's own page for anything it formally requires.
What this exam covers
Use the published domain weights to plan your study. Practice results do not predict your certification exam score.
01Computerized Engine Controls Diagnosis and Repair
02General Diagnosis
03Fuel, Air Induction and Exhaust Systems Diagnosis and Repair
04Emissions Control Systems Diagnosis and Repair
Topics
- Positive Crankcase Ventilation (1)
- Exhaust Gas Recirculation (2)
- Secondary Air Injection (AIR) and Catalytic Converter (2)
- Evaporative Emissions Controls (3)
Learning objectives
- Positive Crankcase Ventilation (1)
- Exhaust Gas Recirculation (2)
- Secondary Air Injection (AIR) and Catalytic Converter (2)
- Evaporative Emissions Controls (3)