In the air injection system, air is sucked in during a pulsed increase in pressure in the line during the exhaust gas exhaust. For this purpose, clean air is used, passed through an air filter.
The system consists of reed valves located on the air filter housing and supply pipes and hoses.
Checking the technical condition
A symptom of a malfunction in the air injection system is the reverse penetration of exhaust gases through the air filter. Always check all hoses carefully. Check that all connections are free of damage, dirt and leaks.
A simple system health check can be performed with the engine running.
Remove the top cover and air filter element.
Pic. 8.2. Checking the operation of the reed valve of the air injection system using a sheet of paper
Place a piece of paper over the reed valve inlet with the engine warmed up to operating temperature and idling (pic. 8.2).
When the engine is idling, a steady flow of air must be sucked into the valve. Have an assistant press the accelerator pedal.
As the engine speed increases, observe the vacuum, which should increase.
If the vacuum does not increase, then this indicates a leak in the hose or that the hose is kinked, or the reed valves are faulty.
Increase the engine speed to 1500 rpm-1 and check for exhaust gas leakage at the air hose connection.
If both tests fail, replace the reed valve.
Replacement
Remove the air filter.
Pic. 8.3. Reed Valve Parts
Loosen and remove the screws securing the reed valve body cover, lift and remove the valves and filters from the body (pic. 8.3).
Installation is carried out in the reverse order of removal.