What does a secondary air injection do?
Table of Contents
What does a secondary air injection do?
The purpose of the secondary air injection pump is to reduce hydrocarbons in your emissions system. So, if you have a bad secondary air injection pump, then it means your emissions system will be allowing too many hydrocarbons to be released into the atmosphere.
What is secondary air and why is it necessary?
To reduce the level of these pollutants, ambient air with a high oxygen content (“secondary-air”) is injected into the exhaust manifold directly downstream of the exhaust valves during the cold starting phase. This results in post-oxidation (“afterburning”) of the pollutants to form carbon dioxide and water.
How do you fix a secondary air injection?
How to Fix
- 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)
Can you drive with a bad secondary air injection?
While failing a smog test is a serious enough problem, the real danger from a bad air pump is the possibility that reduced engine performance and driveability could cause be hazardous to your driving safety.
Where is secondary air injection valve?
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 causes secondary air injection malfunction?
CAUSES OF A FAILURE: CAUSE OF FAILURE 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 much is an air injection pump?
The average secondary air injection pump replacement cost is between $250 and $400. This is significantly cheaper than replacing the primary air pump, which can cost from $600 to $700. Keep in mind that the exact cost for your vehicle’s repairs will vary depending on what you drive and where you take it in for repairs.
Will a car run without secondary air pump?
The air injection smog pump pushes air into the exhaust system right after the exhaust manifold, to help intercept and burn those unburned fuels. Which begs the question: Does a car need a secondary air injection system to run? Strictly speaking, no, it doesn’t.
What are signs of bad smog pump?
Symptoms of a Bad or Failing 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. Another common symptom of a bad air pump is a reduction in power output from the engine.
- Check Engine Light comes on.
Is the secondary air injection system important?
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.
Where is the secondary air injection system located?
The secondary air injection pump is usually located on the engine or at least in the engine bay. It can sometimes be hidden deep into the engine bay, but mostly you will find it installed pretty visible on the engine.