2. Start the engine and warm it up to normal operating temperature (the fan should turn on twice).
3. Stop the engine and connect the tachometer according to the manufacturer's instructions.
4. Apply the parking brake and block the wheels. Set the transmission to neutral.
Engines with carburetor
5. Disconnect the hose from the outlet air temperature control valve and plug it.
6. Start the engine and measure the idle speed. Compare it with the data given on the plate under the hood. If necessary, adjust the engine speed with the quantity screw.
Fig. 37.6 Quantity screw
7. Stop the engine and connect the hose.
Fuel Injected Engines
8. On 1985 through 1987 models, disconnect the #10 vacuum hose connecting the idle air control solenoid valve (located at the rear wall of the engine compartment) and intake manifold (see fig. 37.8a). On 1988 and later models, disconnect the 2P connector from the electronic air flow sensor (see fig. 37.8b).
Fig. 37.8a Hose No.10 on 1985-1987 models
Fig. 37.86 2P connector on models produced since 1988
9. Start the engine and measure the shaft speed. Compare the data with the recommended ones. If adjustment is required, turn the screw located on the throttle body.
Fig. 37.9a Idle speed adjustment on 1985-1987 models
Fig. 37.9a Idle speed adjustment on models produced since 1988
10. Turn off the engine and disconnect the tachometer.
11. Connect the hose or connector.
[Publication reprinted from the website: HondaBook.ru]