For 1990-2009 cars

### Removal Procedure

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the negative battery cable.
2. Disconnect the pre-converter oxygen sensor connector.
3. Remove the exhaust manifold heat shield bolts.
4. Remove the exhaust manifold heat shield.
5. Remove the auxiliary catalytic converter nuts from the exhaust manifold.
6. Remove the exhaust manifold retaining nuts in the sequence shown.
7. Remove the exhaust manifold.
8. Remove the exhaust manifold gasket.

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

9. Clean the sealing surfaces of the exhaust manifold and the cylinder head.

### Installation Procedure

1. Install the exhaust manifold gasket.
2. Install the exhaust manifold.

Notice: Refer to Fastener Notice in the Preface section.

3. Install the exhaust manifold retaining nuts and tighten them in the sequence shown.

Tighten
Tighten the exhaust manifold retaining nuts 25 N·m (18 lb ft).

4. Install the auxiliary catalytic converter nuts to the exhaust manifold.

Tighten
Tighten the auxiliary catalytic converter-to-exhaust manifold nuts to 40 N·m (30 lb ft).

5. Install the exhaust manifold heat shield.
6. Install the exhaust manifold heat shield bolts.

Tighten
Tighten the exhaust manifold heat shield bolts to 15 N·m (11 lb ft).

7. Connect the pre-converter oxygen sensor connector.
8. Connect the negative battery cable.