Bmw secondary air pump

What is the secondary air pump on a BMW?

What is the purpose of the secondary air pump ? The primary purpose of the secondary air pump (SAP) is to reduce harmful emissions. Hydrocarbon (HC) and Carbon monoxide (CO) gasses are the two main gasses which contribute to smog.

Do you need a secondary air pump?

Fuel needs pressurized air to burn, but as it’s being expelled from the engine it’s surrounded mainly by gases. The air injection smog pump pushes air into the exhaust system right after the exhaust manifold, to help intercept and burn those unburned fuels. So, the law says you need a secondary air injection system.

What does a secondary air pump do on a car?

What Does a Secondary Air Pump Do ? The secondary air injection pump (also referred to as a smog pump or SAI pump ) is responsible for lowering the number of carbon emissions that come out of the tailpipe of a vehicle . This is necessary since a vehicle engine is never 100% efficient in the combustion process.

How do you test a secondary air injection pump?

Perform an acoustic check . The sound of a working electric pump will be quite audible when the engine is cold and at idle. When you switch off the engine, you will clearly hear how the pump stops. If the secondary air injection pump sounds normal in the acoustic test , go on and perform a few more checks.

What causes secondary air injection malfunction?

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.

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

All cars are required to have secondary air injection systems, which make exhaust emissions cleaner and help to combust more harmful gases. If your secondary air system fails, then replacing it will cost you between $270 -$390. The labor should run you about $90, while parts cost, on average, about $250.

How long does the secondary air pump run?

120 seconds

What is the purpose of secondary air injection?

Secondary air injection (commonly known as air injection ) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller secondary combustion of exhaust gases.

What is the prime source of problems in secondary air systems?

WATER is a prime source of problems in secondary air systems.

What is a secondary air injection system malfunction?

Error Code P0410 is described as Secondary Air Injection System Malfunction . This means there’s an issue in the vehicle’s emission system , and can be caused by either electrical or mechanical failure .

How can you tell if you have a bad air pump?

Usually, a failed air pump will produce a few noticeable symptoms that can alert the driver that the vehicle requires attention. Engine is running rough. One of the first symptoms of a bad or failing smog pump is a rough running engine. Reduced horsepower. Check Engine Light comes on.

What does the secondary air system do?

The secondary – air pump draws in ambient air and injects it into the exhaust manifold downstream of the exhaust valves. There is a separate integrated air filter if the air is not drawn in from the intake system but rather directly from the engine compartment.

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How does a secondary air injection work?

Secondary air injection systems pump outside air into the exhaust stream so unburned fuel can be burned. Newer aspirated systems use the vacuum created by an exhaust pulse to pull air into the pipe. The latest systems use an electric motor to pump air . These systems are critical for the life of the catalytic converter.

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