Join Date: Feb 2011
Location: France (Europe)
Drives a Santa Fe 2.0L diesel, 4WD, year 2004
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Well, maybe your throttle pedal sensor is giving too high voltage signal when idling.
You could check by undoing the pedal sensor connector at the throttle pedal.
When revs fall back then it's that pedal sensor. Could then also be a grounding wiring problem for at idle those are very low voltages.
When revs stay high, something else is going on.
However, the EMU will not like it and throw the check engine light, but when you put back the connector the light will go out by itself after some rides.
It will also write some error codes in memory but they can be discarded when you check for error codes.
So, when revs stay high, maybe a bit stuck throttle valve at the air intake or a foreign object inside.
It all is EMU controlled voltages so cure of EMu is a bit difficult.
In some post about idling I read about a throttle valve learn, so maybe that is the case. Check other earlier threads about idling.