How do you lower Hydrocarbon Emissions?

Question

My Chevy Silverado has good Carbon Monoxide readings for inspection purposes but it horribly failed the Hydrocarbon test( like 900). The vehicle is driven very hard and had a recent transmission change to a heavier transmission. Is there a way to drop the Hydrocarbon emissions and would the transmission change have anything to do with this?

Answer 1

change your spark plugs give it a tune up. Or buy the gas additive the pass or don't pay stuff. No Transmission has nothing to do do with emmisions

Answer 2

Extra HydroCarbons means you're not burning all the fuel. What's strange is, this usually means you're gonna have alot of carbon monoxide to go with it. There are a couple of possibilities here. Use a higher octane fuel, first of all, since it's a performance truck to begin with. Also, check for vacuum leaks. You may have a leak that is preventing the right amoung of airflow into your chamber. The most likely, however, is that your fuel injectors are not atomizing the fuel, and droplets are making it to the chamber. Since liquid gasoline doesn't burn, they are ejected if not evaporated and burned in time. Buy some fuel injector cleaner. Also, it's possible that your spark plugs aren't getting enough spark to burn all the fuel, but again, this usually also causes carbon monoxide. Try changing your plugs and wires and rotor/button if it's been more than 20,000 miles. Finally, you could possibly have a leaky exhaust valve, which is ejecting fuel during compression and before the burn. Yeah, that sounds like a good possibility... but very difficult to repair if you don't have time, money and an engine lift system. (Easy if you do)