What is a throttle control cable?
The throttle control cable, also known as the accelerator cable, is a braided metal wire that connects the gas pedal to the engine throttle plate. When you press the gas pedal, the cable lifts the plate. This allows fuel and air to enter the intake, which makes you go faster.
On carbureted engines, the throttle body is part of the carburetor. It is opened and closed via the throttle control cable and a link from the gas pedal and engine vacuum. When the valve opens, more fuel is delivered
On newer fuel-injected engines, the throttle body is typically found between the air filter and the intake manifold and is connected to the gas pedal in two ways:
Electronically via a wire
When you press the gas pedal, the butterfly in the throttle body pivots to allow more airflow into the manifold. The throttle position sensor then reports to the ECU that the gas pedal has been pressured, which means the airflow sensor detects more air and sends a message to the car’s computer to increase how much fuel the injectors supply.
The gas pedal won't work correctly when the throttle control cable stops moving freely. If it gets stuck in the open position, the engine will surge. If stuck in the closed position, the car won’t accelerate.
Either way, you won’t have control. If it happens while you’re driving, it could put you in a perilous situation with a runaway car
or a car that can’t move out of the way. If your gas pedal isn’t responding properly, there’s a good chance it’s the throttle control cable. If that’s the case, a mechanic can open the hood
, disconnect the faulty cable, and install a new one. How do I know if my throttle control cable needs replacing?
To spot throttle control cable problems before they become critical, look for the following common symptoms:
Cruise control
problems. Your car may jerk in cruise control or not maintain a consistent speed.Damage to the cable covering. The cable is covered in a protected rubber coating. If you examine the cable and see damage to the coating, the whole cable should be replaced.
Delayed engine response. If there’s a lag between when you press the gas pedal and when the engine accelerates
, the problem may be the cable.
If you establish you need a throttle cable repair, take it to a mechanic
. Alternatively, depending on the age of your car, the repair or replacement may be covered under warranty. Call your local dealership and speak to a car care specialist to determine if it’s covered. How often should the throttle control cable be replaced?
The throttle control cable is essential to your vehicle’s operation and is built to last. On average, its lifespan is about five years. However, not all cars have them. Some newer cars operate with an electronic throttle control system instead.
If you notice any of the symptoms of a worn throttle control cable, contact your local mechanic and have it replaced as soon as possible.
Can I replace my throttle control cable myself?
If you're car-savvy and want a weekend DIY project, replacing your throttle control cable is straightforward. But if you’re not familiar with the underhood of your car and don’t have the required tools, it’s best to leave it to the professionals and bring your vehicle to a mechanic for help.