Engine revving up and down

2016 HYUNDAI SANTA FE
18,000 MILES • 2.3L • 4WD • MANUAL
Avatar
CHESHIRECAT18
  • MEMBER
  • 1 POST
the engine idle is fine when starting but when engine is warm it revs up and down when at t/lights or standstill. it stops this when it reaches normal idle revs.

any ideas?

thanks
Feb 1, 2021 at 7:20 PM
Advertisement
Avatar
SEVAG P
  • ✓Experienced Mechanic
  • 405 POSTS
hello,

It sounds like throttle valve defected or just needs cleaning, for more diagnosis read fault codes and send to us.

check our link below how to read fault codes.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check our link below how to check erratic idle and how to clean throttle valve.

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

https://www.2carpros.com/articles/throttle-actuator-service

Let us know what happens with you.

thank you.
Feb 1, 2021 at 9:30 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.