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.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: I belive its my alternator put 3brand new batteries in the car and still want start

Hey thanks for writing in about your 1990 Lexus LS400. A no crank condition such as this will not be the alternator. You either have a bad starter or a bad connection. The most effective tool to diagnose this condition...

Q: Need help identifying issue please!

Hello, thank you for writing in. It is possible the leak was starting to form when you were driving around the last couple of days. Automatic transmissions have a complex amount of components, seals, gaskets, and various passages for the...

Q: 2004 Mazda Tribubte shut off

This may be a sign of a failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.