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1998 subaru legacy outback.Will not pass at idle. HC are too high measuring 132. Passes @ 2500 RPMs

Sparkplugs & wires are new. Do I have timing to check or is it fixed. No engine check light is not on. Car runs smooth at idle and no signs of power loss. Car has 180,000 on O.G. CAT. What more would you advise to check
Answer:

Ignition timing may certainly be an issue. We don't have specs on what degree the timing should be set to. Our emissions application manual indicate you need to refer to the underhood "emissions label". Timing will absolutely effect HC (hydrocarbon) on your Subaru Legacy. Some other factors that come into play are the CO and CO2 readings. CO2 readings should measure around 15% indicating complete combustion. CO should not be too low. Low CO maybe causing a lean misfire resulting in high HC as well. First thing first... Check the ignition timing. posted by SmogTips Support

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