High hydrocarbons are most often caused by unburned fuel. Do you have a check engine light on indicating a fault. The problem could be a catalyst that is not working properly, excessive fuel saturated oil(crankcase vapor), faulty oxygen sensor(s). Before you go throwing any parts at it, the basic maintenance needs to be assessed. Then having the problem diagnosed hands on, would be a suggestion.
Friday, August 26th, 2011 AT 1:38 AM