For 1990-2009 cars

1. Clean the intake manifold mating surfaces.
2. Inspect the intake manifold for damage.
3. Inspect the intake manifold for cracks near metallic inserts.
4. Inspect the crankcase ventilation passages in the intake manifold face for blockage.

Caution: Wear safety glasses in order to avoid eye damage.

5. Clean the crankcase ventilation passages with compressed air if necessary. Use a maximum of 172 kPa (25 psi) of air pressure.
6. Replace the intake manifold as necessary.

1. Clean the intake manifold mating surfaces.
2. Inspect the intake manifold for damage.
3. Inspect the intake manifold for cracks near the compression limiters.
4. Inspect the crankcase ventilation passages in the intake manifold face for blockage and clean as necessary.
5. Replace the intake manifold as necessary.