Before you start to check ignition timing, you should check for leaks and the overall condition of the engine.

• A. True
• B. False
• C. Not necessary
• D. Optional

Answer: (A)

Before you start to check ignition timing, you should check for leaks and the overall condition of the engine. If there are vacuum, fuel, or coolant leaks, or if the engine has worn parts, the engine won’t respond normally and timing readings can be skewed. A vacuum leak changes airflow and idle speed, which can make timing marks appear off. Leaks or a deteriorating ignition system can cause misfires or irregular operation, hiding the true timing setting. Ensuring the engine is leak-free and in good condition gives you a stable, reliable baseline, so the timing you set reflects the engine’s actual firing characteristics.