The ignition system of the Toyota 4Runner is the most essential segment of the entire engine system as it is the bit responsible for producing the quintessential spark that jumpstarts the operation of the entire Toyota 4Runner engine system. The ignition system is comprised of several key elements that must be in perfect synch with each other’s operation for the engine to achieve its highest possible performance. Among these components is the leading edge Denso spark plug which is tasked with the very delicate job of igniting the air and fuel mixture in the Toyota 4Runner cylinder. The power that is generated by the Toyota 4Runner ignition coil is transported to the Toyota 4Runner distributor before being conveyed to the Denso spark plug for final disposition. It is very crucial for the operation of the ignition system as well as the entire engine system of the Toyota 4Runner that the Denso spark plug is always in perfect functioning condition. If there is even the slightest damage in the Denso spark plug, the efficient function of all the other components of the Toyota 4Runner ignition system would be to no avail. The malfunction of the Denso spark plug could stem from a number of causes, primary of which is wear due to the tremendous amount of high voltage electricity that it is constantly exposed to. Once this happens, immediate replacement would be the best course of action. Call now for your Denso spark plug replacements.