Genuine Pontiac G6 Secondary Air Injection Pump

Pontiac G6 Secondary Air Injection Pump Parts Questions & Experts Answers

• Pump Assembly, Secondary Air Injection (W/ Bracket)
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  Q: How to replace Secondary Air Injection Check Valve and Secondary Air Injection Pump on Pontiac G6?

  A:

  An air injection system is found on 2009 3.5L engines to help upstream catalytic converters reach their optimal operating temperature during engine warm up, for a duration not exceeding 1 minute after start up. The system entails PCM, electric air pump, 2 solenoid/check valves, 2 injection manifolds, and all the related wiring, relays, hoses, and tubing; every solenoid valve has an air pressure sensor. If the PCM see the need of secondary air injection during warm up, it will turn on the air pump and both solenoid valves to let fresh air to be drawn through the Engine air filter and then forced through the injection manifolds which are situated below the exhaust manifold to ensure air reaches each exhaust port. This injected air helps in complete combustion of the rich start-up fuel mixture; otherwise the fuel mixture would be underburnt and cool the catalytic converters and delay their warm-up. The air injection system is intended for long-term use as it only comes in during the period of warm-up, besides which the major parts of it being are easily serviceable. The air pump is located to the immediate underside of the throttle body inlet and is designed such that the engine cover and throttle body intake duct have to be taken off for its servicing. To access the interior of the emission control system, the Y-shaped discharge tube has to be detached from the pump and manifolds, and the mounting nuts of the pump have to be removed to lift off the pump; as for the procedures of installation, they are the converse of the removal processes. The solenoid/check valves are in the vicinity of the air pump and as a result, require the owner to have the engine cover, intake air duct and other related parts removed. The pump discharge tube from the valve must be disconnected as well as the valve discharge pipe from the manifold by the removal of two nuts. Once the mounting bolts are removed, it is possible to lift the valve off and always it is advisable to use a new gasket. The valve can then be reinstalled in the reverse manner. The air injection manifolds are located below the exhaust manifolds, and the exhaust manifold covering the injection manifold being worked on, has to be taken off. To access the solenoid valve, the tube connecting to it has to be unbolted by undoing the nuts, and the injection manifold has to be unbolted by undoing the four bolts that hold it to be lifted off: after replacing the gasket with a new one, it is bolted back on in the reverse manner.