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Incomplete combustion is the cause of high hydrocarbons. Have the vehicle serviced. (i think the answer looked for here is what is the most common cause of the hydrocarbons. most know that HC is unburned fuel so the causes would be miss fire or bad plug wire or plug or even coil pack but it is bad ignition system that cause HC so look in that area even a vacuum leak so look around those areas)

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Q: What is the cause for a failed smog test on a 1996 Chrysler town and country if the only area it failed was to high hydrocarbons?
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