For 1990-2009 cars

### Cleaning Procedure

1. Clean the exhaust manifold in solvent.

Caution: Refer to Safety Glasses Caution in the Preface section.

2. Dry the exhaust manifold with compressed air.

### Inspection Procedure

1. Inspect the left exhaust manifold for the following:

• | Damage or corrosion above acceptable tolerances to the exhaust manifold exterior.

• | Damage to the exhaust manifold mounting holes.

• | Damage to the threaded holes for the heat shield.

• | Damage to the exhaust manifold flange bolt holes.

• | Damage to the gasket sealing surfaces.

• | Damage or restrictions within the exhaust passages.

2. Repair or replace the left exhaust manifold and/or components as necessary.
3. Measure the alignment or surface flatness of the exhaust manifold (2) flanges, using a straight edge (1) and a feeler gauge (3). Exhaust manifold surface flatness must not exceed 0.254 mm (0.010 in).
4. If the surface flatness is not within specifications, the exhaust manifold (2) is warped and must be replaced.