- Reduce system pressure. Disconnect the battery ground cable.
- Drain the coolant to a point below the intake manifold.
- Remove the coolant hose at the throttle body.
- Disconnect the air inlet pipe.
- Disconnect the throttle cable.
- Mark and disconnect all vacuum hoses at the throttle body.
- Mark and disconnect all wiring at the throttle body.
- Disconnect and cap the fuel inlet and return lines. When removing the inlet line, remove the two bolts and slowly pull the pipe, allowing the residual pressure to escape. Do not pull the line right off.
- Remove the four bolts and lift off the throttle body.
Do not remove or disassemble the following parts:
- ISC servo.
- Throttle valve.
- Injector holder screens.
- Fuel return nipple.
Do not clean the following parts in solvent:
- TPS sensor.
- Variable resistor.
- ISC servo.
Most screw-type fasteners are securely installed and may be more difficult to remove than they look. Always use the proper size and type screwdriver to avoid damaging the screw heads.
- Remove the TPS.
- Remove the hose between the fuel pressure regulator and the mixing body.
- Remove the injector retainer screws and lift out the retainer.
- Remove the fuel pressure regulator from the retainer.
- Remove the pulsation damper cover from the retainer and take out the spring and diaphragm.
- Pull the injector from the throttle body. Use your fingers; never grab the injectors with pliers!
- Remove the injector gaskets from the throttle body.
- Remove the throttle return spring and damper spring.
- Remove the ISC servo mounting bracket screws and lift off the servo and bracket.
- Unbolt and remove the upper half of the throttle body assembly.
- Clean all parts, noting the earlier cautions.
- Assembly the components. Use new gaskets and seals. Never reuse a gasket or seal. When installing the injectors, use finger pressure only. Injector retainer screws are torques to 12-16 in. lb. Make all necessary adjustments described above.
Install the throttle body. Torque the top half mounting screws to 14 ft. lbs. Always use new gaskets. Use a new O-ring on the fuel inlet hose. Run the engine and check for leakage and proper operation.