Contents
- 1 How does a secondary air injection work?
- 2 What is the purpose of injecting secondary air into the exhaust ports during warm up?
- 3 How does air injection work?
- 4 How do I know if my secondary air pump is bad?
- 5 What does a secondary air injection system do?
- 6 Do you need a secondary air injection system?
How does a secondary air injection work?
Secondary air injection systems pump outside air into the exhaust stream so unburned fuel can be burned. The system injects the correct amount of air using inputs like coolant temperature, air temperature, and oxygen sensors.
What is the purpose of injecting secondary air into the exhaust ports during warm up?
The secondary air injection system introduces oxygen into the exhaust during engine warm up. This causes the fuel injectors to read lean, which in turn causes the powertrain control module (PCM) to add more fuel. This additional fuel helps warm up the catalytic converter faster.
What is the purpose of air injection system?
An air injection system forces fresh air into the exhaust ports of the engine to reduce HC and CO emissions. The exhaust gases leaving an engine can contain unburned and partially burned fuel. Oxygen from the air injection system causes this fuel to continue to burn.
What causes a secondary air injection system 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.
How does 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.
How do I know if my secondary air pump is bad?
5 Symptoms of a Bad Secondary Air Injection Pump
- 1) Check Engine Light.
- 2) Failed Emissions Test.
- 3) Weak Acceleration.
- 4) Engine Stalling.
- 5) Low Idle.
How do you fix a secondary air injection system malfunction?
How do you fix a secondary air injection system malfunction?
- Replace both the air pumps and the one-way check valve.
- Try and clean the air pump and test it. The one-way air check valve must be replaced as well.
- Replace the inlet hose of the air pump.
- Replace the fuse of the air pump (you can find it under the hood)
What is the purpose of secondary air injection?
The primary purpose of a secondary air injection system is to consume the excess fuel that is injected during cold-start enrichment before it can reach the catalytic converter. This has the effect of improving tailpipe emissions.
What does a secondary air injection system do?
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. 1 Development. Oct 12 2019
Do you need a secondary air injection system?
The air injection smog pump pushes air into the exhaust system right after the exhaust manifold, to help intercept and burn those unburned fuels. The system is critical to help cars achieve government emissions standards. So, the law says you need a secondary air injection system .
Where is the secondary air injection system located?
The secondary air injection pump is located under the left corner of the front bumper area.The pump is accessed from under the vehicle with the plastic air dam shield removed.