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2005 Jeep Rubicon Failed Smog Check for High HC

My 2005 Jeep Rubicon has 20k. I installed K&N intake system. At about 60 miles after install, engine light came on. Local shop reset light. Ran about a tank of gas before smog test. No light came on. Took test and failed. Report said high hc. 15 mph meas 52, max is 52. 25 mph meas 38 max is 36. Ave is 4. Co% at 15mph meas .16, max is .66. 25 mph meas .09, max is .80. Ave is .01. No at 15 mph meas 10, max is 517. 25 mph meas 14, max is 770. ave is 13. Any advise would be helpful, thanks.

Answer:

It would be good to know which "trouble code" was triggered by your Jeep Rubicon's ECU while the check engine light was on. From your Jeep's emissions it appears it may be running slightly rich, which could be causing your Rubicon's high HC. The diagnosis for this fault should begin with inspection of the fuel injection “feedback” system. This includes ensuring the oxygen sensor, along with other air/fuel metering sensors such as the mass air flow sensor and engine coolant temperature sensors, are working properly your vehicle's emissions computer is receiving the signals from these components, the computer is computing the data properly and sending the correct signals to the fuel injectors to either increase or decrease fuel delivery to the combustion chambers. Typically high HC is due to defective ignition components. However with late model technology ignition components on vehicles now can last over 100,000 miles. posted by SmogTips Support

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