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On vehicles that do not have electronic throttle control, or drive-by-wire, there is a throttle cable that runs from the back of the accelerator pedal to the throttle body or carburetor. When the pedal is pressed, the cable pulls the butterfly valve on the carb or throttle body, and allows more air to enter the engine. When the pedal is released, the butterfly valve inside the carb or throttle body should spring closed to its resting position. The throttle return spring is the part that returns the valve to a closed position. There are two types of throttle return springs: one is attached directly to the carburetor or throttle body, while the other is part of the throttle cable. If the throttle return spring is broken, missing, or damaged, the throttle cable will not easily return the valve back to its resting position.
The throttle spring will last the lifetime on most vehicles. It is not a component that requires regular servicing or maintenance. If the throttle return spring breaks or you experience a related symptom, have one of our expert mechanics diagnose your throttle system.
Because a broken throttle return spring can cause your engine to race, not addressing the issue can put you in a dangerous position. Have a broken or damaged throttle return spring replaced as soon as it is diagnosed.
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