2001 Hyundai Elantra - Idle surge

HIKEMOOVER

MEMBER
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?

Tuesday, March 21st, 2006 AT 8:30 PM

1 Reply

PEPPERMRJ

MECHANIC
1,158 POSTS

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.

PO303
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