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Irregular Revving and Idling.

Tiny
JWADE86
  • MEMBER
  • 2000 HYUNDAI SONATA
  • 4 CYL
2000 Hyundai Sonatas: Irregular engine idling and surging* at random often resulting in car shut down. No codes come up. Replaced TPS but did not fix problem. Any ideas?

*(Engine revs to 3-4000, drops to idle rev, then surges back to 3-4000 | When driving car randomly revs on its own. Pressing brake to avoid accident often results in engine shut down)
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Saturday, April 30th, 2011 AT 8:00 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Saturday, April 30th, 2011 AT 8:19 PM

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