What to know about the Throttle Return Spring:
On vehicles that do not have electronic throttle control, or drive-by-wire, there is a throttle cable that goes 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 unconstrained, 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.
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Facts to Note:
A weak or broken throttle return spring can cause your engine to race.
If your vehicle is furnished with drive-by-wire, it does not have a throttle return spring.
How to Fix:
The vehicle battery is disconnected
The air cleaner assembly and faulty throttle cable is removed
The new throttle cable is fixed and the throttle is exercised for appropriate operation
The air cleaner is reinstalled and the battery is reconnected
The repair is confirmed and the vehicle is road tested for proper throttle operation
The throttle spring will last the lifetime on most vehicles. It is not a component that requires regular servicing or upkeep. If the throttle return spring breaks or you experience a related symptom, have one of your expert mechanics analyze your throttle system.
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Common symptoms indicating you may need to change the Throttle Return Spring:
No resistance in the accelerator pedal when pressed
Accelerator pedal doesn’t return back to the top when released
Engine RPMs will not come down the accelerator released
Importance of this service:
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 changed as soon as it is analyzed.