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Posts Tagged: high HC

Fix high HC and failed emissions test

How to deal with failed emissions test and high HC What causes high HC? If you’ve failed your emission test due to high HC readings, this post is for you. 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. High HC can be caused by improper combustion, where: • Combustion didn’t occur due to misfire (weak spark or no spark due … Read More

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