Chevrolet 17075080 Valve Assembly, Air Injector Control

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The air injection reactor system acts to minimize the amount of hydrocarbons in the exhaust through the introduction of fresh air into the exhaust manifold ports of each engine cylinder helping in the burning of the uncompeted hydrocarbons. It runs through all engine speeds and the passage of air is blocked only sometimes during deceleration and at high speeds when fresh air in abundance may cause back fires. In GM engine, the parts of this system include the air injection pump, an air diverter valve, manifold, and injection tubes, and the check valves that are provided at the end of hose connected to the pump. Installed automotive systems are dependable, but failure of any of them leads to engine surge, back firing, overheating sparks, although the air-pump is the most sensitive part. The drive belt should also be checked for crack or fray and also make sure that it has the right tension. The hose should be examined for flow when the engine is on, and the diverter valve should discharge air when tested. Exhaust gases should not re-enter the air pump and for this; check valves should be installed and the functionality checked. Hose connection leaks can be done with the help of a soapy water solution to identify the leaks. For removal and installation of this air pump, the disconnect hoses, and compress the drive belt and finally remove the securing bolts. The diverter valve comes with hoses as well as securing bolts to be disconnected during removal and also has some particularities to be used with regard to the replacement valves. High temperatures may mean that the air manifold and injection tubes will need penetrating oil to remove and installation needs anti-seize compound on threads. These valves cannot be removed without disconnecting the air supply hose, then using wrenches for slow and cautious removal; the process of installation is similar to the process of removal.

For the check valve, disconnect the line from the pump assembly and unscrew it from the air injection pipe, with installation following the reverse order.

Check valves prevent exhaust gases from flowing back into the air pump and should be tested for proper function.