High HC emissions, CO & NO is ok

Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it’s not always that the engine’s ignition system is responsible for high Hydrocarbon emissions.

What causes high HC and CO emissions?

What causes high HC emissions? Excessive HC results from ignition misfire or misfire due to excessively lean or rich air/fuel mixtures.

How do you reduce HC emissions?

The researchers concluded that:

  1. Injection splitting up is the greatest parameter to soften combustion noise thanks to a milder HCCI. …
  2. High-pressure EGR loop without a cooler—as a basic but limited solution—can reduce HC-CO emissions at very low load.

What would a high HC low CO and high O2 at the same indicate?

General Rules of Emission Analysis

Remember, CO readings are an indicator of a rich running engine and O2 readings are an indicator of a lean running engine. High HC, high CO, and high O2 at same time indicates a misfire due to excessively rich mixture.

How do you fix high NOx emissions?

Fuel switching is the simplest and potentially the most economical way to reduce NOx emissions. Fuel-bound NOx formation is most effectively reduced by switching to a fuel with reduced nitrogen content. No. 6 fuel oil or another residual fuel, having relatively high nitrogen content, can be replaced with No.

What does HC mean on emissions test?

High Hydrocarbon

High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it’s not always that the engine’s ignition system is responsible for high Hydrocarbon emissions. Read on.

What causes high CO readings?

High Carbon monoxide readings tend to point to what I like to call “unbalanced combustion“. You see, it could be due to lack of combustion air, too much gas, or too much excess air. No matter how you slice it, the combustion process is out of balance.

Can spark plugs cause high NOx?

If the base timing is advanced too far, the spark plug will ignite the air fuel mixture early, causing the combustion temperature to rise as the compression stroke continues, causing NOx to form.

Will changing spark plugs reduce emissions?

Bad spark plugs — plugs that are fouled, damaged or too cold for the engine — are going to increase your hydrocarbon and carbon monoxide emissions, while a decent set of aftermarket plugs should reduce them.

Does changing spark plugs improve emissions?

Increased fuel efficiency and lower emissions. The proper heat range of your spark plugs and your engines’ tune-up will improve fuel efficiency and reduce harmful emissions into the environment surrounding you.

Can new spark plugs help emissions?

A few simple steps, including installing a new set of E3 spark plugs, can help assure your vehicle passes emissions testing. Get an oil & filter change: Dirty oil results in dirty emissions.