Common Reasons Of Failing Emission Test…

Emission test is conducted on vehicles to understand the degree of pollution the vehicle can cause……

There are certain standards have been established As per Environmental Protection Agency (EPA) USA to pass the emission test under strict surveillance …

But sometimes engine fails the test …so what are the common causes of failing the test ….

Causes

Defective Ignition system

Faulty oxygen sensor

Bad fuel Metering

Leaks in Vehicle Vacuum

Faulty Evaporative

emission control system…

Rich fuel mixture

Rich Fuel Mixture :

Faulty oxygen sensor faulty mass air flow sensor leaking fuel injector Excessive fuel pressure..

Defective ignition system…

Reasons affecting defective ignition system..

If the vehicle fails the test due to improperly monitored exhaust fumes then it’s definitely a problem with oxygen sensor…

The Oxygen sensor in vehicle measures the percentage of oxygen available in exhaust gas…

Bad fuel metering…

At the time of test if the fuel metering doesn’t show correct air-fuel mixture or out of specification then test conductor will definitely reject the vehicle….

What is the reason behind bad fuel metering …??

Faulty computerized engine control faulty carburetor Faulty Fuel Injection Unit

Leaks in Vehicle Vacuum

What are the causes of vacuum leak .. ???

Leaks in gasket Leaks in vacuum lines….

Faulty Evaporative emission control system…

A faulty evaporation system prevents gasoline vapor to being released into atmosphere …

Causes affecting Faulty Evaporative emission control system..

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