Q: Car accelerates when I'm not trying to

asked by on September 29, 2016

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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

I drove through a puddle and my car won't start.

Hello, thank you for writing in. The crankshaft position sensor would cause the vehicle not to start if there was an issue with it. With that being said, there may be a variety of other issues due to the water...

Rattling noise under car

Damage often occurs to a vehicle when it hits a curb, even it the initial impact seems small. Your Nissan Versa could be experiencing one or more of its splash shields, found underneath the vehicle, come loose and is now...

car stalls when stopping

The Service Engine Soon Light is the equal to the Check Engine Light. A proper diagnosis for the Service Engine Soon should be performed to find out what is going on. A tune up may help but the Service Engine...

Related articles

The Best Used Cars to Buy If You Have 3 or More Kids
If If you have three or more kids, you could probably get by with a mid-size sedan if all you want to do is take them from Point A to Point B. Realistically, though, having kids means music lessons, athletics,...
The Best Used Cars to Buy If You’re a Wedding Planner
As As a wedding planner, the demands placed on your time are going to be significant, even if you’re only dealing with one or two couples. You need to be a master juggler when it comes to your time and...
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.