GM 24505066 Pump Kit, Secondary Air Injection

The operate known as AIR system is implemented in all models that use the V6 engine and manual transaxles to lessen the hydrocarbons and carbon monoxide chucked out by the engine's exhaust by hitting an air injector into the exhaust ports of each of the cylinders. Using an air pump, it discharges air into the exhaust stream; an Electric Air Control (EAC) valve controlled by the Electronic Control Module (ECM) regulates the discharge of air in conformity with the temperature of the engine and the general driving conditions of the vehicle. During deceleration, all the air is directed to the atmosphere, so as to avoid back firing. A check valve to its exhaust stream is another feature of the system to avoid backflow return. There are an engine-driven air pump; an EAC valve; air hoses; a check valve; and from 2007-electrically driven pump. Since it is a system, it may be somewhat difficult in identifying problems, however, the parts of the system can be examined. Inspections should being with hoses and wire checks whereby they are checked to ensure that they are in good condition. The pump can be tested by using the engine with normal temperature and using mouth to try to suck air from the pump hose. Check valve must permit air flow in only one direction, while vacuum at the air control valve must also be checked. In the case of component replacement, to adjust or replace pump drivebelt, bolts are to be loosened and the pump has to be removed. AIR pump pulley and filter is easily serviceable by compressing the drivebelt and removing the bolts on the pulley; however, when replacing the filter, one must avoid causing overhead damage to the pump housing. Most of the hoses and tubes must first be removed and then replaced with new ones made of the same type of material and with approximately the same dimensions as the old ones; the check valve can be replaced simply by disconnecting it from the assembly. The EAC valve is designed to be replaced by disconnecting the battery and subsequently, all hoses and connectors connected to the valve. The AIR pump can be removed by freeing the drivebelt and removing mounting bolts; AIR pump installation is to be done in reverse order with attention being paid on the tension of the drivebelt.

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.

The AIR system includes the electric AIR pump, check valves, and hoses and pipes connecting these components.