Skip the auto shop - Our mechanics make house calls

Q: Car accelerates when I'm not trying to

asked by on

Car doesn't slow down when I try to park. It backs out too fast too when my foot is not on the pedal.

My car has 153000 miles.
My car has an automatic transmission.

A: Hello. Your car uses a throttle body with a...

Hello. Your car uses a throttle body with a throttle cable to accelerate the engine. Most of the time this is caused by a throttle body that is dirty or failing or a throttle cable that is not releasing. It can also be caused by a vacuum leak but that is not as common. I usually check and clean the throttle body first if it is dirty. If that does not help I check and make sure that the throttle plate is closing like it should. I also make sure that the throttle cable is moving freely. If all of this is fine then it may be a bad throttle position sensor.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Power window not working

The problem could be in the switch or the motor / regulator. It could also be a fuse. You will have to see if the motor is receiving power when the switch is pressed. If so, the motor is bad....

Q: Which sensors are most important for monitoring and improving the engine’s performance?

The way modern electronic engine control systems are designed, all of the sensors are important but some are more crucial to the vehicle than others. For example, if the engine electronic control unit (ECU) loses the input from the coolant...

Q: My car overheats

Hello, thank you for writing in. The cooling system does not always rely on the overflow reservoir that you can see into. Most of the coolant is stored in the radiator when it is off. This is also known as...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...