OEM Chevrolet Suburban 1500 Secondary Air Injection Check Valve

Chevrolet Suburban 1500 Secondary Air Injection Check Valve Parts Questions & Experts Answers

• Check Valve
  12556070
  Q: How to replace the Secondary Air Injection Check Valve/Pipe on Bank 2 on Chevrolet Suburban 1500?

  A: To replace the Secondary Air Injection Check Valve/pipe on bank 2, remove the clamps and air hoses from the air system right pipe and disconnect the check valve from the air pipe and the right air pipe from the Exhaust Manifold. Before replacing the existing check valve, test the existing check valve by connecting a Vacuum Pump to the nipple side (AIR pump side) of the check valve and pumping up to 10 inches h g and observing the gauge. If the bleed down time of the vacuum to zero is less than 5 seconds, the check valve should be replaced. To install the new check valve, attach the same to the air pipe and tighten it at a torque value of 23 n.m (17 lb ft) then connect the right air pipe to the Exhaust Manifold and tighten it to a torque value of 20 n.m (15 lb ft). Finally, install the hose and clamp to the check valve and check air system for proper operation.