Posts Tagged: high HC

Understanding High HC Reading: Causes and Solutions

Failed a smog test due to high HC reading: How to diagnose and fix the problem If you’ve failed your emission test due to a high HC reading, this post is for you. Let’s start by understanding what causes a high a 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. High HC can be caused by improper combustion, where: • Combustion didn’t occur due to misfire (weak spark or … Read More