Discovery I | '94-'99
Check basic tune state: timing, cap, rotor, ignition wires and fuel filter. Check for any vacuum leaks. Remove the air intake hose and inspect the throttle plate and housing for dirt and carbon. Clean with an air intake and throttle housing cleaner or a good grade of carburetor choke cleaner reinstall intake hose and any other parts removed. Remove the idle air control valve and housing located at the right rear of the intake plenum. Remove the valve from the housing. Clean the openings on the housing paying attention to the seating area for the idle air control valve and its' plunger. Install the valve back into the housing and install back on the plenum. Making sure that all gaskets are good. Start the engine, check operation. Check the base idle. Must be done on a fully warmed engine. Turn off all accessory loads. Connect a tachometer. (Dash one not accurate enough). Clamp off the hose between the throttle housing and the idle speed control housing. The speed should be 525 +or- 25rpm. If not, remove the plug on the throttle housing and adjust the bypass screw until correct speed is attained. Replace the plug.
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