Secondary Air Injection Pump Function and Failure Symptoms

In this article, we are going to explain about the one part in the engine systems known as: secondary air Injection pump. After read this article, you will know the basic function and failure symptoms of this part.

Basic Function

The secondary air injection pump is responsible for lowering the number of carbon emissions that come out of the tailpipe of a vehicle. This component is also called a smog pump, or an air pump, and it lies within the secondary air injection system of the vehicle. It can reduce carbon emissions by pumping fresh air from outside into the exhaust stream. By the time fumes leave the tailpipe, there are fewer hydrocarbon pollutants in them. This promotes a safer environment by cutting down on air pollution outside.

If there is ever a problem with your secondary air injection pump, then more hydrocarbon pollutants will be in the fumes which come out of your tailpipe. You won’t realize this until you receive an emissions test. Either that or you’ll experience a lot of unfortunate symptoms that will affect your engine. Both scenarios are not something you’ll want to happen. They can make your life rather difficult if you do.

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5 Failure Symptoms

Secondary air injection pump failure is easy to recognize if you know which symptoms to watch out for. As a courtesy to you, we have listed the top 5 symptoms of secondary air injection pump failure below. If you experience even one of these symptoms, then you should take your vehicle to your local auto mechanic and have them take care of it right away. Otherwise, the problem will only get worse for the emissions and for your engine.

1) Check Engine Light – One of the early symptoms of a bad secondary air injection pump is the Check Engine warning light turning on. The engine control unit can automatically detect when the secondary air injection pump has gone bad. Since the functionality of the air pump impacts the engine, any problem with it will activate the Check Engine warning light on the dashboard.

2) Failed Emissions Test – The purpose of the secondary air injection pump is to reduce hydrocarbons in your emissions system. So, if you have a bad secondary air injection pump, then it means your emissions system will have an abundance of hydrocarbons. Not only does this spell trouble for the environment, but it also spells trouble for whenever you get an emissions test. If you happen to live in a state which requires emissions testing, you will fail the test if your secondary air injection pump is bad.

3) Weak Acceleration – A faulty secondary air injection pump will cause problems for the air-to-fuel ratio in your internal combustion engine. If this ratio is not balanced, then your engine will have trouble generating speed whenever you press the gas pedal. Weak acceleration could be caused by several mechanical issues, but a bad secondary air injection pump is certainly one possibility. A failed emissions test in conjunction with weak acceleration can leave no doubt in your mind that it is the pump’s fault.

4) Engine Stalling – You may be driving normally and then suddenly experience engine stalling or hesitation in your vehicle. A secondary air injection pump that is wearing down can cause inconsistent power gaps from the engine. One minute the power may be fine, and the next it may be weak. If the pump is not replaced, the power will stay weak.

5) Reduced Engine Speed – When your engine is idle, check the tachometer and see what the current RPM is. The normal RPM of an idle engine is around 1,000. But in situations when the secondary air injection pump is not working, you can expect the RPM to drop. If you’ve already experienced engine stalling, weak acceleration, and a Check Engine warning light, then you need to have the secondary air injection pump checked out immediately. If it is proven to be the problem, have it replaced by the mechanic.

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