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RPMs surge?

Tiny
PHIL SAVILLE
  • MEMBER
  • 2004 HYUNDAI SANTA FE
  • 2.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 147,000 MILES
The engine starts great and warms up nicely. Then, at tick over the revs seemingly randomly surge up to 1,200 RPMs, sit there for 30 sec then drops back to tick over! There appears to be no rhythm to it. It has revved higher at times. I have changed the idle control valve, the throttle position sensor and MAF sensor, but no change. I have checked for vacuum leaks as well as I can. It has started to randomly increase revs whilst under load now. I’m considering changing the Coolant Temp sensor and Inlet Air temperature sensor but not sure if I’m just throwing money away.
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Sunday, September 17th, 2023 AT 10:17 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,305 POSTS
I have seen a dirty throttle body cause this problem, here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

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

Check out the images (below). Please let us know how it goes.
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Monday, September 18th, 2023 AT 12:52 PM

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