Final answer:
The recommended procedure for cranking a vehicle that is reluctant to start is option d) Crank for 30 seconds and then wait for 2 minutes before trying again. This avoids damage to the starter motor and over-draining the battery. If the vehicle still does not start, it's advisable to consult a professional.
Step-by-step explanation:
When attempting to start a vehicle that is reluctant to start, the recommended procedure is to follow a pattern that avoids damage to the starter motor and allows the battery to recover slightly between attempts. It's crucial to avoid excessively long cranking periods that can overheat and damage the starter motor or drain the battery too much.
Therefore, option d) Crank for 30 seconds and then wait for 2 minutes before cranking again is usually advised. After cranking for 30 seconds, if the vehicle does not start, it's important to give the starter motor time to cool down and the battery time to recover, hence the 2-minute wait. More than this amount of cranking without the engine starting indicates that there might be a mechanical issue that needs professional diagnosis. It's important to troubleshoot the possible reasons for the starting problems, which could range from a weak or dead battery, issues with the starter motor or alternator, fuel system problems, or even more complex engine issues.
In practice, gently pressing the accelerator while cranking might help if the issue is related to fuel delivery, but this should be done in moderation. If these efforts do not result in the engine starting, or you hear unusual noises, it's advisable to seek the assistance of a qualified mechanic rather than persisting with further attempts that might cause additional damage.
Remember, excessive cranking can be detrimental, and identifying the cause of the starting issues can save time and potential repair costs. The mention of the correct option answer in the final answer is option d).