How does the secondary air pump work?

How does the secondary air pump 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.

What does the secondary air injection pump do?

The secondary air injection pump—The electric secondary air injection pump suppliespressurized, filtered air to the secondary air injection solenoid (shutoff and check)valves. The secondary air injection pump is a turbine type pump that is permanentlylubricated and requires no periodic maintenance.

How does a secondary air system work in a car?

Newer vehicles with variable valve timing on both exhaust and intake camshafts can adjust the timing so that a small amount of exhaust gas is sucked back into the chamber during the intake stroke. Secondary air injection systems pump outside air into the exhaust stream so unburned fuel can be burned. Early air systems have a belt-driven air pump.

When does the air injection pump start up?

This occurs when the start-up engine coolant temperature (ECT)is between −10 to +56°C (14–133°F), the intake air temperature (IAT) is greater than−10°C (14°F) and it has been more than 60-minutes since the last engine start. Thesecondary air injection pump operates 5–60-s after start-up.

What is the secondary air injection solenoid assembly?

The secondary air injection solenoid (shutoff and check) valve assemblies—The valveassemblies have direct current (DC) motor operated valves.

Where does the secondary air pump go in a car?

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 does a secondary air injection system work?

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

When to replace a secondary air injection pump?

If you’ve already experienced engine stalling, poor acceleration, and a check engine warning light, then you need to have the secondary air injection pump checked out immediately. If it is proven to be the problem, have it replaced by a certified mechanic.

What kind of system is an air pump?

An air pump, also commonly referred to as a smog pump, is an emissions component that is part of the secondary air injection system.