Toyota 21100-61140 CARBURETOR Assembly

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Position the carburetor on the gasket and install the mounting fasteners. To prevent carburetor distortion or damage, tighten the fasteners to approximately 16 ft-lbs in a criss-cross pattern, 1/4-turn at a time.

The analysis of carburetor problems should include inspecting vacuum hoses and actuators, tightening intake manifold and carburetor mounting nuts/bolts, performing compression and vacuum tests, cleaning or replacing spark plugs, checking spark plug wires and ignition primary wires, inspecting ignition timing, checking fuel pump pressure/volume, checking heat control valve in the air cleaner, checking/replacing air filter element, checking the PCV system, checking/replacing fuel filter, checking for a plugged exhaust system, checking EGR valve operation, checking the choke, checking for fuel leaks and kinked or dented fuel lines, checking accelerator pump operation, checking for incorrect fuel or bad gasoline, checking valve clearances and camshaft lobe lift, and having a dealer service department or other repair shop check the electronic engine and carburetor controls.

Set the parking brake and block the wheels, then remove the air cleaner and turn the idle speed adjusting screw out as far as possible without the engine running rough.