The Toyota MR2 Throttle Cable is a simple device that is designed to connect the throttle plate of an engine to the accelerator pedal via a direct, mechanical connection. Thus, the driver can modulate the amount of airflow that enters the engine just by using their feet. In early generations, the Throttle Cable was comprised of a braided metal wire that was routed from the cockpit to the throttle body. The pedal pull opens the butterfly valve so that more air can enter. Sensors then tell the PCM to enrich the fuel so that there is a brisk response. Subsequently, the Throttle Cable was replaced with sensors and a motor (electronic throttle control) in later versions of the sports coupe, but many motorsport aficionados keep the original Throttle Cable or restore it because of its crispness and predictability. Across the production run, two main approaches therefore exist, a traditional cable and the drive-by-wire setup, and knowing which your Toyota uses is vital when sourcing the right length, end fittings, and firewall grommet. It is easy to inspect the Throttle Cable on first and second-generation MR2 models. If the cable is showing signs of fraying strands, stiff motion, or uneven idle signal then it is time to swap the Throttle Cable before it snaps and strands the lightweight MR2 roadside. The Toyota's pedal stroke is light thanks to a smooth, corrosion-free sheath that allows the engine to respond quickly while maintaining the car's playful nature.
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