Q: Q: My car is accelerating by itself.

asked by on

I started my car earlier today and it vibrated and then stopped. I started its few more times and was able to drive it very slowly. Even with my foot down all the way on the pedal, there was very little acceleration. About 15 minutes later I tried again and it drove fine for roughly 500m but then it stopped accelerating and I pulled into a parking lot. I shut off the car, waited 5 minutes and started it again. With the car in park and my foot on the break, the engine began to rev as if I was repeatedly pushing my foot on the accelerator. I shut it off and 5 minutes later I started the car like normal and reversed 20 meters. I then put it in drive and slowly pulled forward with my foot pressed gently on the gas. Suddenly the car accelerated to ~4,000RPM and lurched forward and nearly crashed into the wall before I slammed on the break and shut it off.

Here is a video of the car accelerating while in park. My foot was off the gas during this.

https://youtu.be/XtUD2rk064U

My car has 85000 miles.
My car has an automatic transmission.

Hi Conor. Thanks for contacting us today. In most cases, the issue of ’self acceleration’ is caused by one of the following; a damaged throttle body, vacuum leak, electronic throttle control, or idle control valve issue. This is a rather serious issue that should be inspected by a professional mechanic and resolved before driving the vehicle further and as soon as possible for safety reasons.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: My car is accelerating by itself.

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: Q: Battery light

Hello, thank you for writing in. The charging system is controlled by the PCM (powertrain control module). The module receives input information to keep the electrical system operating, if the voltage goes below 9.0 volts the light will come on...

Q: Car starts but acts like it doesn't want to

Hey there. This sounds like a faulty alternator. Use a multi-meter to test the alternator's output voltage. Good alternators test in the range of 13.8-14.2 volts and make sure to use the 20 volt setting, or you could receive a...

Q: Q: My key won't turn on to start car

Hi there. It sounds like you either have a worn key or worn key cylinder. Have a new key cut and see if the new key turns the cylinder to start the car. If that does not work, then the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...