Final answer:
The correct resistance when checking spark plug wires should be 5,000 ohms per foot. This allows for the proper amount of electrical current to create a spark for the engine's combustion process, and the correct option is number 2.
Step-by-step explanation:
Resistance of Spark Plug Wires
When checking the resistance of spark plug wires, the resistance should generally be 5,000 ohms per foot. This is a standard measure for ensuring the spark plug wires are functioning properly. The resistance of spark plug wires can vary between manufacturers and applications, but the typical range is between 3,000 to 7,000 ohms per foot. The resistance within this range allows the spark plugs to receive the sufficient amount of electrical current needed to create a spark, which is essential for the combustion process within an engine.
The resistance in the wires is measured to prevent issues such as engine misfires, reduced fuel efficiency, and potential damage to other components like the ignition coil and catalytic converter. Proper maintenance and checks of the spark plug wires' resistance help ensure the engine runs smoothly. In the given options, number 2 which is 5,000 ohms per foot would be the correct choice.
It is important to note that while checking the resistance is part of good vehicle maintenance, one should also consult the vehicle's service manual or spark plug wire manufacturer's specifications for the precise resistance range recommended for specific wire sets.