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.
How do you test a BMW secondary air pump?
What does the secondary air pump do e46?
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.
How do I know if my secondary air pump is working?
The secondary air pump has to start audibly after a cold start of the engine. Start vehicle engine. If the power supply of the secondary air pump is fine, but the secondary air pump runs with a scraping, whistling or scratching noise or not at all, the secondary air pump is to be replaced.
How do you check if the secondary air pump is working?
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.
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 a secondary air pump cause a misfire?
Can a Secondary Air Pump Cause a Misfire? Yes, a misfire is a common sign of a faulty secondary air system. If the pump isn’t working properly, there will be too much fuel and not enough oxygen in your vehicle, which often results in a misfire.
What causes a secondary air injection pump to fail?
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. 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.
What turns on the secondary air pump?
How do you fix a secondary air injection system malfunction?
- Replacing the air injection pump and power relay.
- Replacing O2 sensors that respond too slow as they age.
- Replacing the air injection pump intake filter clogged with debris.
How much does it cost to fix a secondary air injection system?
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.
How do you test a secondary air check valve?
- Loosen the connecting hose on the secondary air non-return valve leading to the secondary air pump.
- If there are deposits on this side of the valve (finger test, see Fig.
- Inspect the secondary air pump and replace it if necessary.
How can you tell if you have a bad air pump?
- 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.
How do you clean a secondary air injection system?
The basic procedure is to put solvent and compressed air into the SAI system on the top of the engine and clean the ports from the bottom until air runs freely through the passages.
Can I drive with a P0410 code?
You may drive your vehicle with a P0410 however keep in mind your vehicle will not pass a smog inspection. Problems with the air injection system will not cause any driveability symptoms. The check engine light or malfunction indicator lamp will be illuminated as long as a P0410 is recorded in the ECC.
Can I drive my car with a P0410 code?
Diagnosis: This trouble code will not prevent your vehicle from running. The most common result is increased emission from your vehicle. However, if left unsolved, this code could cause your vehicle to fail emission(s) testing.
What is the code P0411?
What the P0411 code means. P0411 indicates that the ECU has detected the flow from the secondary air injection system to be out-of-specification. This causes the Check Engine Light to be set and displayed on the dashboard. The light will remain on until normal operation occurs or repairs are performed.
Can you drive with a broken secondary air pump?
Technically speaking, you can drive without a secondary injection pump. However, doing so is not advised. 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 air injection fails?
If your secondary air injection pump has failed, you may notice that the catalytic converter is not working as well as it should. This problem can lead to a loss in power and performance from your engine. The catalytic converter is the engine’s first line of defense against harmful emissions.
Where is the secondary air pump relay located?
It’s located in the electrical box in the engine bay under the right side air filter.
What is secondary air injection system incorrect flow?
Diagnostic trouble code (DTC) P0411 stands for “Secondary Air Injection Incorrect Flow Detected.” This code warns about a potential airflow issue in the secondary air system.
How do you diagnose a random misfire?
- The engine loses power.
- It is difficult to start the engine.
- Fuel consumption rises.
- Emissions increase.
- The engine makes popping sounds.
- The intake or exhaust manifold backfires.
- The engine jerks, vibrates or stalls.
What is the purpose of secondary air injection?
The Secondary Air Injection System (SAIS) is part of a vehicle’s exhaust system. Manufacturers began introducing it in the 1960s to help reduce hydrocarbon and carbon monoxide emissions, both of which resulted from incomplete combustion.
How does water get into secondary air pump?
Condensation usually gets into the air injection pump due to a faulty air injection pump check valve. This is a large valve located in-between the air pump and exhaust manifold.
What is a P0410?
A P0410 code relates to the Engine Control Module (ECM) and sets when the ECM detects that the engine oxygen sensor has not seen an increase in the oxygen level in the exhaust when the air injection system is functioning.