Carburetor Cleaning and Exhaust Manifold Inspection

1. Remove the air cleaner assembly.

2. Clean the outside of the carburetor using carburetor spray cleaner. Check the choke valve for smooth operation.

3. Using carburetor spray cleaner, clean the choke shaft, Primary Main Air Jet, and the Secondary Main Air Jet (Figure 8).


EXHAUST MANIFOLD INSPECTION

1. Disconnect air control valve hoses.

WARNING:
These procedures must be performed on a cool vehicle. Serious burns can result from a hot exhaust manifold or catalytic converter.

2. Remove air control valve from the air pipe and exhaust manifold.

3. Remove the heat tube from the exhaust manifold.

Note:
Penetrating oil may be necessary to loosen heat tube threads from the exhaust manifold.

4. Disconnect the oxygen sensor electrical connector.





5. Remove the upper heat protector (Figure 9).


6. Visually inspect the back side of the heat protector for signs of gas leakage like black sooty carbon deposits.

7. If you see any sign of gas leakage from the exhaust manifold (black sooty carbon deposit), replace the exhaust manifold as described in the service manual.

Note:
If there is no sign of exhaust gas leakage on the back side of the heat protector, it is not necessary to replace the exhaust manifold.