Question

An engine will not start and no spark is found at the spark plugs when the engine is turned over by the starter. Technician A says that the problem is probably the battery. Technician B says that the ignition system is most likely at fault. Who is correct?

1) Technician A
2) Technician B

Answer 1

The most likely source of the problem when an engine won't start with no spark at the spark plugs is the ignition system, not the battery, if the engine is turning over. Thus, Technician B is correct.

Step-by-step explanation:

The question relates to trouble in starting an engine and determining the probable cause of no spark at the spark plugs. When an engine fails to start and there is no spark present, the most likely issue is with the ignition system. The battery's primary function is to provide power to start the engine. If the engine is turning over, this suggests that the battery is likely functioning to some extent. However, the creation of a spark at the spark plug is controlled by components of the ignition system, which include the ignition coil, distributor, ignition module, and spark plug wires.

Technician A who suggests the battery might be at fault is less likely to be correct if the engine is indeed turning over. Technician B is more likely to be correct as the problem of no spark typically indicates an issue with the ignition system, not the battery.