Intake Manifold Cleaning and Inspection
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Clean the intake manifold mating surfaces.
- Inspect the intake manifold (1) for damage.
- Inspect the intake manifold for cracks near metallic inserts.
- Inspect the crankcase ventilation passages in the intake manifold face for blockage.
- Replace the intake manifold as necessary.
Clean the EGR valve housing (1).
- Clean the EGR valve assembly (2).
- Inspect the EGR valve assembly.
- Replace the EGR valve assembly as necessary.
- Apply 15 inHg to EGR valve.
- Verify that the EGR valve opens.
- Verify that EGR valve does not leak down.
- Replace the EGR valve if any concern is found.