For 1990-2009 cars only
- Clean the upper intake manifold in cleaning solvent.
- Dry the upper intake manifold with compressed air.
- Clean the lower intake manifold in cleaning solvent.
- Dry the lower intake manifold with compressed air.
- Inspect the upper intake manifold for the following:
- Inspect the lower intake manifold for the following:
Caution: Wear safety glasses in order to avoid eye damage.
| • | Cracks or other damage to the exterior (1) |
| • | Cracking or damage in the gasket grooves (2 and 3) |
| • | Damage to the throttle body mounting surface (4) |
| • | Loose or damaged bolt hole thread inserts (5) |
| • | Damage to the gasket sealing surfaces (1, 2 and 3) |
| • | Restricted exhaust gas recirculation (EGR) system passages (4) |
| • | Restricted cooling system passages (5) |
| • | Cracks or damage |
| • | Damage to the threaded bolt holes |
