Skip the auto shop - Our mechanics make house calls

Q: My car revs it's rpms when at park and drives itself to 25 mph without pressure on the gas pedal

asked by on

So when I start my car up it spits and struggles to come alive, when I put it in park the car wants to rev up the engine and rpms, and when the car is in drive it drives itself slowly upto 25 mph without any pressure on the gas pedal. What could be the problem with that?

My car has 240000 miles.
My car has an automatic transmission.

A: This may be a sign of a failing throttle po...

This may be a sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position on the gas pedal. The sensor is usually located on the throttle plate so that it can directly monitor the position of the throttle. The ECU then makes the direction to supply more or less fuel to the motor. When this sensor is not working properly, this can cause intermittent responses when pressing the gas pedal. I would suggest having a professional from YourMechanic come to your home to diagnose your throttle control system.

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・Save up to 30%

Get a quote

What others are asking

Q: There is a strange slip in the engine

This may be a sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that it...

Q: Car taking too long to pick up speed

Hello. If the engine seems to lack power than that can be caused by a number of things. Most of the time this is caused by a weak fuel pump or a failing catalytic converter. As for the headlamp the...

Q: Are the repairs more expensive on this vehicle than on other types of SUVs or trucks?

Hi there: Thanks for writing into YourMechanic.com today seeking advice about buying a reliable SUV. First off, I'd stay away from the Ford and Cadillac Escalade for one simple reason - they both have pretty high ride height; so getting...

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 to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.