What causes high CO and HC emissions?

What causes high CO and HC emissions?

Ignition defects including dirty spark plugs, leaking or open-circuited spark plugs or wires, or defective ignition coils can all result in a shortage of spark energy. Any shortage of spark energy may cause high HC emissions. If the spark occurs at the wrong time, incomplete combustion and high hydrocarbons may result.

How can I lower the HC emissions on my car?

On a precomputer carbureted car, one way to get under the HC and CO limits is to retard the ignition timing. This will slow the idle and provide a longer, hotter burn. Then, bring the idle speed back up to specs with the throttle stop screw or idle stop solenoid, which will admit more air.

What causes high CO levels in boilers?

If the oxygen level is set too low and something changes the combustion process can become ‘fuel rich’ as there is insufficient oxygen for all the fuel to burn. This can cause high levels of CO to be generated and in the extreme enough fuel to enter the boilers flue and ignite (explode) outside the combustion chamber.

What causes high CO in cars?

Carbon Monoxide is a by-product of incomplete combustion. Carbon Monoxide exceeding maximum limits, can be due to a number of emission failures ranging from inadequate air intake to defective engine computer sensors. This condition is referred to as a “Rich Fuel Conditon”.

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 an emission problem?

How do I fix my emissions problem?

  1. Check the air filter on the air cleaner system.
  2. Inspect the Positive Crankcase Ventilation (PCV) system.
  3. Examine the Evaporative Emissions Control (EVAP) system.
  4. Go over the Exhaust Gas Recirculation (EGR) system.

What can cause high CO?

Household appliances, such as gas fires, boilers, central heating systems, water heaters, cookers, and open fires which use gas, oil, coal and wood may be possible sources of CO gas. It happens when the fuel does not burn fully. Running a car engine in an enclosed space can cause CO poisoning.

How do I reduce the CO in my boiler?

Since CO2 is the goal of burning hydrocarbons, the only way to reduce CO2 is to decrease the load on the boiler by designing more efficient heating or process loads; or by making the boiler/burner package as efficient as possible.

What causes a high HC reading on an emissions test?

Let’s start by understanding what things cause a high HC reading. A high HC reading means the test found high HC (hydrocarbons) in your emissions. In other words, too much gas is left in the exhaust after combustion.

What happens if you fail the HC ppm test?

If you fail the HC PPM part of the test, it could mean that there is a problem with the carburetor, fuel injection system or oxygen sensor, or that the engine oil is diluted or the air cleaner is dirty. Tip. Ask for diagnostic work to be performed on your vehicle if you fail the HC PPM portion of the test.

What should my HC ppm reading be on my car?

Determine whether you pass or fail the HC PPM part of the test. The number of hydrocarbons allowed varies from state to state, but generally for vehicles made after 1994, your vehicle will need an HC PPM reading of below 50.

What causes high hydrocarbons in a fuel failure?

Common high HC failures. Common HC faults. Failed high HC. Failed high Hydrocarbon. What Causes High Hydrocarbon (HC)? Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition.