Question about 2002 Kia Spectra

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I have a 2001 KIA Spectra, 1.8 liter 4 door, Problem: rough idle, at inital start up car runs fine, after warm up car idles rough, DTC: po 300 shows random missfire, Recent Repairs and Parts Replaced to try and resolve problem: Timing belt, pcv valve replaced and clean pcv system, ICA valve replaced, spark plugs replaced, plug wires replaced, coil-packs replaced, installed injector cleaner through fuel tank, checked for vaccume leaks (found none), wiring harness wiggle test while running (no change), removed O2 sensor (looks fine Lt. brown in color), decarbonize system through vaccume port, Called KIA MOTORS was told possible cause could be Evap-system (part ORVR valve), disconected vaccume line at intake, pluged intake vaccume port (no change in idle)evap-system lines and parts appear ok, test pressure at fuel pump (pressure is good) do not have access to scanner that reads live data, only freeze frame, Data Collected: ETC: 185f., RPM: 1680rpm, %ENG. Load 12.94%, Speed: 24MPH., STFT: .78, LTFT: -.78, Fuel System:cl, readings taken after car was warmed up, would be thankful for any help to resolve this problem, thanks.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Scorpedo
  • 111 Answers

SOURCE: 04 kia sorento runs poorly

Might be going super simple here but from what you have said have you checked the wiring on your sensors? If you know that one works and you swap it and its not working its very possible the wires farther up are shorted or burned somewhere.

Posted on Dec 12, 2008

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  • 232 Answers

SOURCE: 2000 Kia misses

Change the fuel filter and pressure regulator, restart the computer.

Posted on May 06, 2009

  • 40 Answers

SOURCE: 2000 Kia Spectra

http://www.kiatechinfo.com/index.asp

Good source for Kia its free to register NO STRINGS

Posted on Jun 01, 2009

  • 85 Answers

SOURCE: 2002 kia sedona 3.5l has rough idle replaced plugs wires and coil

this vehicle has coil packs for the ignition correct? have you ran the engine at night with all surrounding lights outs so its really dark. spray a mist of water on the coil packs and spark plug wires to see if you have spark/voltage leaks jumping out from them. sometimes the tiny sparks will be so fine and skinny you can barely see them so it needs to be dark. hope this helps your trouble shooting. a coil pack could have such a fine crack for the voltage to leak from that you cant see it.

Posted on Jun 13, 2009

roniecon
  • 6927 Answers

SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

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