Q: Car idles high at startup

asked by on February 09, 2016

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?
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

My car starts but will not stay running at idle.

You may have 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 at idle. Since...

The power steering goes out occasionally, the AC does not work, and the engine loses power.

The O2 sensor has many codes associated with the sensor itself. Some codes can indicate that your engine is running lean and alternatively some can mean that your engine is running too rich. The power steering and A/C have pressure...

Motor stalls when I shift to drive or reverse

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

How Long Does an Idler Pulley Last?
The The drive belt that is on a car runs nearly all of the major components of the engine. Most of the newer cars on the market have a serpentine belt rather than various V-belts. In order for this belt...
The Best Used Cars to Buy to Maximize Resale Value
A A car is not an investment. An investment, by definition, increases in value. A car is a necessary purchase, and it will never appreciate in value, with the possible exception of classics and antiques. So, as a used car...
A Buyer’s Guide to the 2012 Lexus LS
With With a four-generation legacy spanning a quarter of a century, the Lexus LS may not be the riskiest, most cutting-edge vehicle in its class but its devotees don’t mind – the reliability, near perfection of design, and pronounced bent...