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RPM thing goes crazy and goes up to 3,000 RPMs?

Tiny
ITSDANIELLE145
  • MEMBER
  • 2003 HYUNDAI TIBURON
  • 160,000 MILES
Sometimes when I start my car the rpm thing goes crazy and goes up to 3rpms. When im not even hitting the gas. Idk whats wrong or how to stop it from accerating. I dont know what to do about this problem can you please help
Monday, October 21st, 2013 AT 5:36 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like an issue with the idle air control valve (IAC).
Hyundai call that part idle speed actuator (ISA).
This could be due to a dirty valve that has a seized pintle and allowing more air to pass, or it could just have a defective stepper motor inside.

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

Try cleaning out the valve, as many times cleaning out that component can improve the idle quality.

Here are couple of helpful articles:

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works
https://www.2carpros.com/articles/idle-air-control-valve-service

I have attached the IAC/ISA testing procedure for your reference.

Please let me know of any questions.
Thank you.
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Friday, October 1st, 2021 AT 1:46 PM

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