What causes a car to have a high HC reading?
What causes a car to have a high HC reading?
High HC can be caused by improper combustion, where: • Faulty fuel injectors are introducing too much fuel during intake, or clogged fuel injectors are injecting too little fuel into the combustion chamber. • A worn engine is causing too much oil to enter the combustion chamber and the excess oil enters the exhaust.
What does high HC mean on a car emissions test?
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:
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 a catalytic converter?
• The catalytic converter lacks the proper level of oxygen storage capacity so it can’t clean up left over hydrocarbons. The two most common causes of high HC readings are worn ignition parts and unmetered air entering the engine. mass of all incoming air. If the MAF is dirty, it can mess up the readings. Always start by cleaning the MAF sensor.
Why does my engine have a high HC reading?
The two most common causes of high HC readings are worn ignition parts and unmetered air entering the engine. mass of all incoming air. If the MAF is dirty, it can mess up the readings.
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:
• The catalytic converter lacks the proper level of oxygen storage capacity so it can’t clean up left over hydrocarbons. The two most common causes of high HC readings are worn ignition parts and unmetered air entering the engine. mass of all incoming air. If the MAF is dirty, it can mess up the readings. Always start by cleaning the MAF sensor.
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.
