Why is a leak-down test performed, and how should results be interpreted?

Why is a leak-down test performed, and how should results be interpreted?

• A. Assess cylinder sealing by pressurizing the cylinder; high leakage indicates valve, ring, or head gasket issues; results are compared to acceptable specifications for the engine
• B. Measure air intake airflow
• C. Test fuel injector spray pattern
• D. Check coolant level

Answer: (A)