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Hyundai sonata 2002 over revving

The car over revs from normal idle upto 4500 rpm back to 2000rpm back upto 3500rpm and generally all over the place and this happens just in the garage with no foot near the accelerator , I had two qualifed mechanics look neither were sure although one thought it was the purge control solenoid so changed that with no result hopefully someone will have answer thanks

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3 Suggested Answers

Bat1956
  • 585 Answers

SOURCE: Hyundai Sante Fe 2001 6 cyl. - no power; idle only

It may take as much as 60 PSI to overcome the fuel pressure regulator. No, you can't blow through it. I suspect you have a fuel starvation issue. It could be a clogged fuel filter. It may more likely be a pressure leak inside the tank. That pressure gauge you mentioned comes highly recommended at this point. There is a flexible line connecting the pump to the metal line in the tank. If it ruptures, you have only minimal pressure, and the vehicle starves for fuel. Using the gauge, turn the ignition on and off a couple of times, (do not start) If the filter is choked, you will still achieve pressure to overcome the regulator. If it never makes that much pressure, then it is the flex or the pump itself. My first experience with this I found the rupture after the third pump! Embarrassing!


If you find my suggestions to be helpful, please share with us some details so that others may benefit from knowing the whole story. Thank you!

Posted on Dec 30, 2008

polarcycle
  • 1392 Answers

SOURCE: Hyundai Sonata 2002 idle at high RPM and accelerate 40-45 MPH

Look for a vacuum leak somewhere. This is the most common problem for a high idle.

Posted on Jun 23, 2009

mcdevito75
  • 1970 Answers

SOURCE: Revs upto 4000 rpm in idle and while driving too ! all by itslef.

mcdevito75 here, Sounds like the idle speed motor or the idle speed sensor is no good. Your local shop can check this out for you.

Posted on Jun 17, 2010

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