Skip the auto shop - Our mechanics make house calls

Q: Car accelerating while in park, shifts slowly.

asked by on

My car takes too long to shift gears. When in park, the car accelerates by itself.

A: The most likely issue here would be a fault...

The most likely issue here would be a faulty idle air control valve. This can cause the RPMs to rise when the transmission is in park and the engine is just idling. When the engine is not running correctly, the transmission will act differently than it normally would as well. This is sort of a cause and effect deal. I would recommend having your IAC inspected by a professional to determine if it is faulty. If so, have it replaced and see if your transmission reacts differently. If not, check the fluid level. If the fluid level is low, the transmission will also react differently.

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: Exhaust malfunction

Hello. Most of the time with this problem, your EGR (exhaust gas recirculation) valve and EGR solenoid need to be replaced in order to fix your problem. Sometimes this problem can be corrected by cleaning out the EGR valve and...

Q: Cradle

Surface rust on any automotive component, especially under the car is normal and nothing to worry about. "Rotted" is generally used to describe severe rust or areas that have rusted through. If this is the case with your cradle, then...

Q: Dont no think injector

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...