Which is the most common cause of HC failure?

The following is a list of the most common causes: HC Failure is the result of incomplete combustion. Any item that causes incomplete combustion can result in high HC. The most common causes are: NOX Failure is the result of combustion temperatures that are too high.

Why are my internet speed test results so inaccurate?

There are many factors that can slow down your internet connection and affect your measurements and provide inaccurate results. To get accurate speed results while connected to your router over a wireless connection, the placement of your computer or mobile device makes a huge difference.

How can I get accurate WiFi speed test results?

To get accurate speed results while connected to your router over a wireless connection, the placement of your computer or mobile device makes a huge difference. Certain wall materials or other objects can potentially block or interfere with your Wifi signal. Solution: Create a clear wireless path

When to diagnose an emissions test failure?

However, armed with a test report indicating what gases are high can help you determine what systems may not be functional. If the vehicle has failed as a result of high CO and HC, the CO failure should be diagnosed first. If the “Service Engine Soon” or “Check Engine” light is on it should be diagnosed prior to any emissions diagnosis.

What are the results of the HC and co test?

The test results are summarized below: Essentially, HC and CO are far too high while NO is fairly low. Also, CO2 is low, indicating lean conditions. What are some possible causes, and some ways to investigate them, that could cause the test results?

Why are HC and co high and no low?

Essentially, HC and CO are far too high while NO is fairly low. Also, CO2 is low, indicating lean conditions. What are some possible causes, and some ways to investigate them, that could cause the test results? The supplied gas values suggest a rich run condition and possibly a non-functional catalyst.

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 to do if your car fails the HC test?

Check cracks in the air duct from the air filter box to the throttle body. If you can’t find any, spray carburetor cleaner around the intake manifold while watching the O2 sensor readings on your scan tool. In many cases you can see the vacuum leak as it sucks in the liquid spray.