For 1990-2009 cars

### Cleaning Procedure

Notice: Do not place the following components in a solvent or cleaner bath:

• | The Throttle Position (TP) sensor

• | The fuel pressure regulator diaphragm assembly

• | The fuel injector

• | Any other components containing rubber or electrical parts

Do not soak the TBI unit with these components attached. Keep the soaking time in the cleaner to a minimum if the TBI unit requires cleaning. Follow these instructions in order to avoid damage to the TBI unit and component parts.

| Important: Use only Carbon X (X-55) or an equivalent cold immersion cleaner for soaking the throttle body fuel injection (TBI) unit assemblies.

• | Soak the metal parts of the TBI assemblies in a cleaner bath if necessary.

• | Remove any dirt or burns from the fuel and air passages in the TBI assemblies.

| Caution: Wear safety glasses when using compressed air in order to prevent eye injury.

• | Dry all metal components with compressed air.

• | Clean the passages and the fuel injector chamber with compressed air.

### Inspection Procedure

• | Inspect the casting mating surfaces for damage that will affect proper gasket sealing.

• | Inspect the throttle valve and throttle shaft for free and smooth movement.

• | Inspect the fuel injector inlet filter for dirt or damage. If dirt is present check for foreign materials in the fuel pipes and the fuel tank. Repair as necessary.