What does the secondary air injection system do?

What does the secondary air injection system do?

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 injection?

The secondary air valve can be quickly inspected in an easy way:

1. Loosen the connecting hose on the secondary air non-return valve leading to the secondary air pump.
2. If there are deposits on this side of the valve (finger test, see Fig.
3. Inspect the secondary air pump and replace it if necessary.

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…

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 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 combustion of exhaust gases.

How much does a secondary air injection?

The total secondary air injection system replacement cost as an average price comes in around $618 for the car owner. The secondary air injection system usually consists of an electric pump, a control relay, a pneumatic control valve, and a combination valve. This system is controlled by the engine control unit, which is the vehicle’s computer.

How does the air injection system and smog pump work?

Pumped air injection systems use a vane pump called the air pump, AIR pump, or colloquially “smog pump” turned by the engine via a belt or electric motor . The pump’s air intake is filtered by a rotating screen or the vehicle air filter to exclude dirt particles large enough to damage the system.

What is a secondary air injection check valve?

The Secondary Air Injection System (AIR) Switching Valve is the computer controlled valve that controls the air injection into the exhaust system of the engine (this valve may be integral to the AIR pump).