Intake Manifold: Inspection
WARNING: This page is about a different car, the 2003 Infiniti Q45, 2003 Infiniti M45, 2003 Infiniti G35, 2003 Infiniti FX45, and 2003 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
Using straightedge and feeler gauge, inspect surface distortion of intake manifold lower and intake manifold upper. Surface distortion should not exceed 0.004 in. (0.1 mm). See Figure.
Using straightedge and feeler gauge, inspect the surface distortion of each surface on intake manifold. If it exceeds 0.04 in. (0.1 mm), replace the intake manifold. See Figure.