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Bmw secondary air pump purpose?

What does a secondary air pump do?

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.

Can you drive without secondary air pump?

The secondary air pumps purpose is to inject air into the exhaust stream to light off the catalytic converter(s). Without the air pump the catalytic converter(s) will eventually plug up and will have to be removed or replaced. The pump has virtually no drag on the engine so fuel mileage is not an issue.

What does the secondary air injection check valve do?

The secondary air injection system is an emissions system equipped on many road going vehicles. It functions as a one-way valve, allowing the air to pump through into the exhaust, while preventing the exhaust fumes from leaking into the secondary air injection system.

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What is the secondary air system in a car?

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.

Can a bad secondary air pump cause a misfire?

A faulty MAF sensor will cause your secondary air pump not to switch on. this can cause a rich condition, which can cause misfires, etc

How long does the secondary air pump run?

The secondary air pump has to run for about 90 – 120 seconds after a cold start of the engine.

What causes secondary air injection malfunction?

A faulty pump is generally the most frequent cause of the system failing. Faulty ground and voltage supply can also cause the pump to fail. Blocked or leaking lines can also cause the failure or malfunction of the control or combination valve, resulting in the failure of the secondary air system.

Will a car run without a smog pump?

Which begs the question: Does a car need a secondary air injection system to run? Strictly speaking, no, it doesn’t. If your car doesn’t have a smog pump, a couple things can happen.

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

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

What happens when check valve fails?

For example, failing check valves will start to vibrate and even lose some internal parts when problems begin to arise. Other symptoms of check valve failure include reverse flow and excessive component wear and damage. Check valves will also emit noises as they start to break down.

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How do you know if you have a bad air pump?

One of the first symptoms of a bad or failing smog pump is a rough running engine. When a smog pump fails the finely tuned air-fuel ratios can be upset, and it will negatively affect the performance of the engine. The engine may have trouble idling, and may drop in engine speed, or stall when the pedal is pressed.

How does secondary air injection system work?

Secondary air injection systems pump outside air into the exhaust stream so unburned fuel can be burned. Early systems have a belt-driven air pump. 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.

How do you test a secondary air 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 is primary air and secondary air?

Primary air provides a percentage of the combustion air, but more importantly, controls the amount of fuel that can be burned. Secondary air improves combustion efficiency by promoting the fuel to burn completely.

How much does it cost to fix a secondary air injection system?

If your secondary air injection system is failing or damaged, then the secondary air injection system repair cost will run between $270 and $390. The labor should usually cost under $100, while the parts cost on average run at around $250.

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