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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car idles high at startup

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: My lexus sc 400 tunes over but won't stay running

Claimed by Jessica Howe

Q: Car idling rough and missing.

A misfire will generally cause a rough idle, but you must find out if its one cylinder misfiring or a random misfire, this is were a scan tool is essential. If you can trace the misfire to one cylinder its...

Q: my car makes a sound like rocks rolling when i place car into drive cannot hear when in park on under load

It seems you have two separate problems. The "rocks rolling around a tin can" sound is most commonly from the exhaust system. Possibly a broken / loose baffle in the muffler or resonator. Most commonly would be a heat shield...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...