GM 12659290
Check Valve

The replacement of both the secondary air injection shutoff and check valve begins by taking out the exhaust crossover pipe. First remove the AIR feed tube bolt from the heater inlet/outlet pipe bracket then disconnect the secondary air injection (AIR) feed tube quick connect fitting from the AIR shutoff/check valve. The next step requires the removal of the engine wiring harness electrical connector from the AIR shutoff/check valve. After suitable vehicle support you should start by removing the AIR shutoff/check valve nuts before lowering the vehicle. To remove the AIR shutoff/check valve bolts you should extract the AIR check valve together with its companion gasket that needs disposal. Install the NEW gasket onto the AIR pipe studs before you position and install the AIR check valve followed by installing the AIR shutoff/check valve bolts to a torque of 50 Nm (37 lb-ft). With the vehicle elevated, install the AIR shutoff/check valve nuts by torquing them to 10 Nm (89 lb in). Lower the vehicle during installation while you reattach the engine wiring harness electrical connector to the AIR shutoff/check valve and you should finalize by connecting the AIR feed tube quick connect fitting to the same valve. The last step involves attaching the AIR feed tube bol to the heater inlet/outlet pipe bracket while tightening it to 10 Nm (89 lb in). Next, reinsert the exhaust crossover pipe.

The first step to replace the secondary air injection shutoff and check valve requires removing the exhaust crossover pipe. Detach the secondary air injection (AIR) feed tube quick connect fitting from its connection with the AIR shutoff/check valve while also removing the AIR feed tube bolt from the heater inlet/outlet pipe bracket. You should disconnect the engine wiring harness electrical connector that connects to the AIR shutoff/check valve. After supporting the vehicle properly you should take off the AIR shutoff/check valve nuts then lower the vehicle first to access and remove the AIR shutoff/check valve bolts . Remove the AIR check valve after discarding its gasket. Place a NEW gasket on the AIR pipe studs before installing the AIR check valve through positioning it correctly with subsequent tightening of the AIR shutoff/check valve bolts to 50 Nm (37 lb ft). You must raise the car while it remains supported to tighten the AIR shutoff/check valve nuts to 10 Nm (89 lb in). The engine wiring harness should be reconnected to the AIR shutoff/check valve while the vehicle remains on its lower position. Also install the AIR feed tube quick connect fitting to the AIR shutoff/check valve. Place the exhaust crossover pipe back before reattaching the heater inlet/outlet pipe bracket with the AIR feed tube bolt at 10 Nm (89 lb in).

Connect the engine wiring harness electrical connector to the AIR shutoff/check valve, followed by connecting the AIR feed tube quick connect fitting to the AIR shutoff/check valve.