Skip the auto shop - Our mechanics make house calls

Q: Car idles high at startup

asked by on

My car idles high when I start it.

A: The idle air control valve on your car may ...

The idle air control valve on your car may be defective, causing the high idle. A couple of checks would need to be done to determine if this is the case. Your engine needs to be checked for any vacuum leaks, and then the idle air control valve should be checked for carbon sticking valve, and throttle body open. If all of these are okay, then the valve should be checked to be within specifications, electrically. I recommend a mechanic, such as one from YourMechanic, run a detailed inspection of your vehicle's high idle speed.

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: iPhone not charging from car receptacle

Hi. You should have your lighter port changed to a 12 volt charging port. The older ports were only meant to be used as cigar lighters and are not capable of getting a good connection for chargers. They sell these...

Q: After driving the car for 10-15 miles , if I stop the engine and try to start it will CRANK but wont start

Next time this happens, push the gas pedal all the way to the floor. This puts the car into what is called clear flood mode. This means the Powertrain Control Module (PCM) will not supply injector pulse to the injectors,...

Q: Doors Need Oiled?

I would suggest having the doors hinges and swing arm rod checked for binding. If you live near an area that has a lot of exposure to salt water then corrosion may be binding the doors. Have a certified mechanic,...

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 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...
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...