I have a 2001 KIA Spectra, 1.8 liter 4 door, Problem: rough idle, at inital start up car runs fine,...
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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.