The throttle body is located between the air flow meter and the intake manifold. It controls the intake air flow by responding to the accelerator pedal movement. The throttle body shaft if connected to a throttle valve switch.
REMOVAL & INSTALLATION
- On non-turbo engines, disconnect the air intake tube between the air flow meter and the throttle body. On turbocharged engines, disconnect the air intake tube between the turbocharger and the throttle body.
- Unfasten the electrical connector from the throttle valve switch at the throttle body.
- Remove the vacuum hoses from the throttle body.
- Disconnect the accelerator linkage from the throttle body.
- Remove the throttle body-to-intake plenum bolts and the throttle body.
- To install, use a new gasket and reverse the removal procedures. Adjust the throttle linkage and the throttle valve switch if the idle speed is off.
Throttle Valve Switch
See Figures 1, 2, 3 and 4
- Remove the electrical harness connector from the throttle valve switch.
- Using an ohmmeter (set on the 1x ohm position), connect the leads to the No. 2 and 18 pins (1975-78 vehicles), No. 29 and 30 pins (1979-81 vehicles), or No. 18 and 25 pins (1982-88 vehicles). There should be continuity; if not, proceed to the next step.
- Loosen the throttle valve switch-to-throttle body bolts.
- On 1984 and later turbocharged models, disconnect the Auxiliary Air Control (AAC) valve's electrical connector.
- Start and idle the engine (by opening the throttle valve by hand) at 1,400 rpm (1975-79 vehicles), 900 rpm (1980-83 vehicles), 850-950 rpm (1984-88 non-turbo models), or 800-900 rpm (1984-88 turbo models). Rotate the throttle valve switch until it turns from ON to OFF , as indicated by a clicking noise.
If the throttle valve switch cannot be adjusted, replace it.
- Tighten the throttle valve switch-to-throttle body bolts and reconnect the electrical connector.
- On 1984 and later turbocharged models, connect the Auxiliary Air Control (AAC) valve's electrical connector.