FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
:
Car repair manuals for everyone.
Home
>>
Mercury
>>
1994
>>
Topaz L4-140 2.3L HSC
>>
Repair and Diagnosis
>>
Powertrain Management
>>
Emission Control Systems
>>
Air Injection
>>
Air Injection Check Valve
>>
Description and Operation
Air Injection Check Valve: Description and Operation
PURPOSE
The
air check valve
is a one-way valve that allows secondary air to pass into the exhaust system while preventing exhaust gases from passing in the opposite direction.