2001 Hyundai Elantra - Idle surge

  • 2001 HYUNDAI

012My 2001 Elantra started to shift erratically, with RPMs spiking very high. Check Engine light came on. At first I received 2 codes: P0121 and P0121 pending. I still don't know what the pending means. I replaced the Throttle Position Sensor and cleared the codes. Car ran fine for about 20 minutes and then RPMs started to go slightly too low or too high. I came to a stop light and put the car in park for a few seconds and the RPMS began bouncing between 1500 and 2500. The check engine light came back on and I got code P0303, misfire on cylinder 3. Can anybody tell me what's up?

Do you
have the same problem?
Tuesday, March 21st, 2006 AT 8:30 PM

1 Reply


Did you pull hte negative battery cable when you swapped out the TPS? If not disconnect it for a whi;e. Let the computer start fresh with the new TPS.

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer
In that order.

How many miles? Have plugs, wires, etc, been replaced?

Good luck and let us know. :)

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Saturday, March 25th, 2006 AT 8:07 PM

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