Failed Emissions--High Hydrocarbons [Archive] - Toyota MR2 Message Board

valves, lines, checked, sensor, replaced, failed, fine, throttle, vacuum, find, emissions, generally, problem, systems--possibly, accelerates, recently, plugs/wires, plenty, smoothly, runs, good, coil/igniter, power, area, cleaned, filter, breaks, couple, butterfly, valve, thoughts/suggestions, hose, body, freeway, speed, code, place, start, thought, occasionally, yesterday, idle, 16ppm, time, 600rpms, smoother, quieter, sounded, engine, 900-1000rpms

I replaced the O2 sensor and even though I checked vacuum lines, blew air through several valves in the emissions system (did not find any problems with lines or valves) this was all it took. HC levels went from over 900ppm the first time to 16ppm (!!!) yesterday. Idle went from 600rpm