If your engine fails to start, how long should you crank it before checking for problems?

Answer: B — 15 seconds

Cranking the engine for 15 seconds is a recommended practice when diagnosing a starting issue. This duration allows sufficient time for the engine to attempt ignition without risking damage from overheating the starter motor. If the engine does not start within this timeframe, it is advisable to stop cranking to avoid excessive wear on the starter and other components, as prolonged cranking can lead to overheating and potential damage. After this period, it becomes essential to check the vehicle for any underlying issues, such as battery problems, fuel delivery issues, or starter malfunctions, rather than continuing to attempt to start the engine. This approach encourages a systematic troubleshooting process to efficiently identify and resolve the cause of the starting failure.