Using a non-resistor spark plug can potentially decrease engine power. Non-resistor spark plugs can interfere with the operation of electronic ignition systems and onboard electronics in modern vehicles. They can generate electromagnetic interference (EMI) due to the lack of built-in resistance, which can disrupt signals and cause erratic behavior in electronic components. This interference can lead to misfires, inefficient combustion, and ultimately a reduction in engine performance and fuel efficiency.
If you use a non-resistor spark plug, particularly in a vehicle equipped with electronic ignition and control systems, it can cause issues such as radio interference, malfunctioning of electronic devices, and even damage to sensitive components. The absence of resistor elements in the spark plug allows for higher voltage spikes and electromagnetic interference, which can interfere with the proper functioning of the ignition system and other electronic circuits.
The primary benefit of a resistor spark plug is its ability to suppress electromagnetic interference (EMI). Resistor spark plugs contain a resistor element embedded in the ceramic body or integrated into the spark plug wire terminal. This resistor helps reduce EMI generated during the spark discharge, thereby minimizing interference with electronic systems and improving the reliability and performance of the vehicle’s ignition system.
A non-resistor spark plug typically has very low resistance, often in the range of a few ohms or less. This low resistance allows maximum voltage to reach the spark gap for ignition purposes. However, in modern vehicles designed to handle electromagnetic interference and equipped with electronic control systems, the absence of built-in resistance can lead to issues with EMI affecting vehicle electronics.
The resistance of a spark plug does matter, especially in vehicles with electronic ignition systems and sensitive electronic components. Resistor spark plugs are designed with a specific amount of resistance (usually in the range of 5,000 to 10,000 ohms) to suppress EMI and prevent interference with onboard electronics. This resistance helps ensure smooth operation of the ignition system, prevents misfires, and protects electronic components from voltage spikes and EMI-related damage. Therefore, matching the correct type of spark plug (resistor or non-resistor) to the vehicle’s ignition system is crucial for maintaining optimal performance and reliability.