How are Air Injection System Control Valve issues diagnosed?
If the air injection control valve is no longer able to prevent or allow the flow of air to the exhaust system, it will become evident through physical inspection. In the most difficult case, the valve may need to be tested using low pressure air or vacuum.
How are Air Injection System Control Valves replaced?
Replacement of the valve will require separating the valve from the metallic line moving from the air pump to the exhaust manifold and installing the new valve. Note that some valves will be an individual unit which may be integrated with the control solenoid for that valve. These can be on or in the metallic line, or mounted adjacent to the rest of the system.
RepairPal Recommendations for Air Injection System Control Valve issues
Since the air injection system uses rubber press-fit hoses and other components subject to deterioration, any time the system is serviced it is advised to perform a complete inspection of the secondary air system. This includes inspecting for exhaust leaks where the air injection system connects to the exhaust manifold or exhaust pipe.
What to look out for when dealing with Air Injection System Control Valve issues
Portions of this system become extremely hot to the touch as they are directly connected the the exhaust system. Any time this system is service, ensure that the engine has had adequate time to cool. Laser thermometers are advised to locate high temperature areas prior to servicing the system.
Can I replace the Air Injection System Control Valve myself?
Control valves are on the hot side of the air injection system, and will likely be mounted between metal lines or fittings. This means replacing the valve will likely require working in tight, hot spaces, and this may also limit the ability to diagnose the control valve. If diagnostics for the control valve is unclear, or replacement seems to be overwhelming, trust a professional to make sure this repair is done correctly.