What is HC in emission test?
Vehicle emissions are a major source of air pollution in urban areas. The impact on urban air quality could be reduced if the trends of vehicle emissions are well understood. More than 48000 valid gasoline powered vehicle emissions of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxide (NO) were measured.
Does diesel contain methane?
Total hydrocarbons (THC or simply HC) include all gaseous HC species, while non-methane hydrocarbons (NMHC) exclude methane emissions (due to their lesser smog reactivity). In the case of diesel engines, the difference between THC and HC emissions is typically small—on the order of one percent.
What is PM in exhaust system?
Abstract: Exhaust particulate matter (PM) is the most complex of exhaust emissions. Particulate matter, as defined by most emission standards, is filterable material sampled from diluted and cooled exhaust gases. PM contains a large portion of the polynuclear aromatic hydrocarbons (PAH) found in engine exhaust.
How can I reduce emissions?
Drive Less
- Go easy on the gas and brakes — driving efficiently can help to reduce emissions.
- Regularly service your car to keep it more efficient.
- Check your tires.
- Air conditioning and intensive city driving can make emissions creep up.
- Use cruise control on long drives — in most cases, this can help to save gas.
How to troubleshoot an automotive engine high idle?
The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.
Is it normal to have a rough idle?
This is definitely not a normal situation. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top 5 causes that a mechanic would look for.
Why is my idle speed so high on my Land Cruiser?
-Higher idle speed might point to something like the ACSD (auto cold start device) misbehaving – not sure why the battery change would prompt something like this… – I don’t think the alternator running would cause a higher idle speed but if it is the alternator, then you need to track down where the extra current draw is happening.
How can I check the idle air control?
To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness. While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly.