High engine idle

Hello,

Are you getting any trouble codes? Is the check engine light illuminated?

One of the common reason for high idle is a faulty idle air control valve (IAC). Overtime dirt and debris can buildup inside the valve and cause it to stuck open, allowing more air than it supposed to. Which leads to a high idle.

The IAC can be serviced by cleaning it. Many times that improves the idle quality.

Take a look at this helpful guide:

https://www.2carpros.com/articles/engine-idles-too-high


I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

So before changing I look to see if I had a code. Code po503 came up. vehicle speed sensor A intermittent/Erratic/High. Is that the Idle air control?

The code P0503 is for the vehicle speed sensor circuit, not related to the idle air control valve. This usually gets triggered due to an issue with the speedometer or even shifting issues.

I have attached the trouble shooting guide for that code below for your reference.

So, can that code be also why my car has that high idle?

It is a possibility. Go through that guide and see if it helps you determine the issue.