What does a secondary air check valve do?

Secondary air valves are an integral part of the secondary air system. They are fitted between the secondary air pump (1) and exhaust manifold. They prevent pressure peaks in the exhaust flow from damaging the secondary air system and exhaust gas or condensate from entering the secondary air pump.

What does a Subaru secondary air pump do?

This Fits Your Subaru. Smog Pump. An emissions component, that is part of the secondary air injection system, which is responsible for pumping clean air into the vehicle’s exhaust stream to promote a cleaner and more complete burn before the fumes exit the tailpipe.

What is a secondary valve?

Secondary-air valves are fitted between the secondary-air pump and the exhaust manifold. Use is made of different versions. The secondary-air non-return valve stops exhaust gas, condensate or pressure peaks in the exhaust system (e.g. misfiring) causing damage to the secondary-air pump.

Can you drive without secondary air pump?

Technically speaking, you can drive without a secondary injection pump. However, doing so is not advised. What is this? This stems from the fact that a faulty secondary injection pump can cause a host of drivability-related issues, most of which can vary significantly in severity, on a case-by-case basis.

What happens when secondary air pump fails?

What Happens When the Secondary Air Pump Fails? A secondary air pump failure will not be the end of the world, simply because it is not the main air intake. Of course, it can lead to power loss, idling issues, or stalling during cold starts. Pump failure will also affect the emissions output of your vehicle.

How do I know if my secondary air pump is working?

Check Engine Light

One of the most common symptoms of a bad secondary air system is that the Check Engine Light will come on. This light comes on when there is a problem with the engine, and it can be triggered by a variety of issues, including a failing secondary air injection pump.

How do I know if my secondary air pump is bad?

The following are the most common symptoms associated with secondary air injection pump failure.

1. #1 – Check Engine Light.
2. #2 – Erratic Idle.
3. #3 – Reduced Performance.
4. #4 – Failed Emissions Test.
5. #1 – Poor Power/Ground Delivery.
6. #2 – Compromised Vacuum System.
7. #3 – Water Contamination.
8. #4 – Age.

Can a car run without a secondary air pump?

The system is critical to help cars achieve government emissions standards. So, the law says you need a secondary air injection system. Which begs the question: Does a car need a secondary air injection system to run? Strictly speaking, no, it doesn’t.

Can you drive with a bad secondary air pump?

What causes a secondary air pump to fail?

A faulty pump is generally the most frequent cause of the system failing. Ingress of moisture can cause damage which results in seizure of the pump. Faulty ground and voltage supply can also cause the pump to fail.

What are the symptoms of a bad secondary air pump?

The failed secondary air injection pump can cause fluctuation in power. For instance, in one minute your vehicle is performing well and in the other minute, you may face a drop in revs. Thus, you need to replace the pump to avoid continuous engine stalls and ensure a smooth drive.

How much does it cost to replace a secondary air pump?

If it is broken, then you need to replace it as quickly as possible. Overall, repairing a secondary air injection system will cost you around $450. This cost is split between the cost of parts and the cost of labor. New parts will cost about $250 while labor will usually cost another $150-$200.