What causes high hydrocarbon emissions?

What causes high hydrocarbon 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.

What is a NOx fail?

engines failing NOx caused by lean condition. General Motors Multiport Fuel Injection engines may fail emissions standard testing due to excess Oxides of Nitrogen levels in the exhaust gas. Here are some steps to determine and correct the cause of high NOx emissions.

How do you lower NOx for smog?

The best way to minimize NOx formation is to reduce flame temperature, reduce excess oxygen, and/or to burn low nitrogen-containing fuels.

What is HC ppm in the smog test?

Find “HC PPM” within the tailpipe section. You read this as hydrocarbon parts per million, and it means the number of hydrocarbon molecules for every million molecules emitted through the exhaust.

How can I reduce HC in smog?

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.

How do I get my CO emissions down?

But there are things you can take into account to improve your driving and ways to maintain your car to ensure you are reducing your car’s emissions as much as possible….

1. Use a cleaning agent.
2. Use better fuel.
3. Change the oil.
4. Change the air filter.
5. Check your tyre pressure.
6. Air conditioning system.
7. Reduce idle time.

How do you pass an emissions test with diesel?

How to pass diesel emissions test

1. Your vehicle must not have visible smoke coming out from the exhaust.
2. Your vehicle’s Diesel Particulate Filter (DPF) must not have been removed or tampered with.
3. Your vehicle must not exceed the emissions restrictions for diesel engines.

Will my car pass smog If I reset the check engine light?

If you clear the ‘Check Engine’ light, or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run. You can also pre-test your vehicle, and confirm that it will pass without issue.