See Figures 1 and 2
Some fuel injected 2.3L engines are equipped with an air injection system called Pulse Air or Thermactor II. This system does not use an air pump. Instead, the system uses natural pulses, (present in the exhaust system), to pull air into the exhaust manifold and catalyst through air tubes. The pulse air valve is installed to the exhaust manifold, and connects the catalyst to the to the air cleaner silencer with a hose.
See Figures 3 and 4
- Visually inspect the thermactor hoses, control and check valves for leaks that may be caused by a backflow of exhaust gas. If the holes are found, the check valve may be faulty.
- The valve should allow free flow of air in only 1 direction (See illustrations). Exhaust gases should be blocked in the opposite direction.
- Remove the inlet hose from the valve. At idle and normal operating temperature, air should be drawn into the valve.
- With the vacuum line removed, the airflow should stop. If these conditions are met, the valve is operating properly.
- If not, check for vacuum at the valve. If vacuum is present, but no air flows, check the pulse air check valve, silencer filter and air cleaner for blocked or restricted passages.
- If vacuum is present and no blocked or restricted passages are found, replace the valve.
REMOVAL & INSTALLATION
Pulse air control valve-all models
See Figures 3 and 4 (above)
- Remove the clamp that secures the hose to the assembly.
- Rotate and remove vacuum and inlet hoses
- Carefully remove the control valve from the engine by unscrewing it from the threaded collar on the manifold.
- Coat the threaded end of the control valve with engine oil. Thread the control valve into place on the exhaust manifold.
- Lubricate hose ends of valve. Fasten hoses to assembly.
- Tighten the hose clamps.