Toyota 21100-11393 CARBURETOR Assembly

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To relieve the tank pressure, you need to remove the fuel tank cap.

Before conducting any major carburetor service work, it is important to perform a thorough road test and check the carburetor adjustments. Carburetor problems can manifest as flooding, hard starting, stalling, severe backfiring, and poor acceleration. If the carburetor is leaking fuel or covered in wet-looking deposits, it requires attention. However, it is essential to consider that some performance complaints attributed to the carburetor may actually be caused by loose, out-of-adjustment, or malfunctioning engine or electrical components, as well as vacuum hose leaks, disconnections, or incorrect routing. Therefore, a comprehensive analysis of carburetor problems should include inspecting vacuum hoses and actuators, tightening intake manifold and carburetor mounting nuts/bolts, performing a cylinder compression test, cleaning or replacing spark plugs, checking spark plug wires and ignition primary wires, inspecting the ignition timing, examining the fuel pump, assessing the heater control valve in the air cleaner, checking/replacing the air filter element, inspecting the PCV system, checking/replacing the fuel filter, examining the exhaust system for blockages, checking EGR valve operation, ensuring the choke is completely open at normal engine operating temperature, checking for fuel leaks and kinked or dented fuel lines, inspecting accelerator pump operation, checking for incorrect fuel or bad gasoline, checking valve clearances and camshaft lobe lift, and having a dealer service department or repair shop assess the electronic engine and carburetor controls. When diagnosing carburetor problems, it may be necessary to start and run the engine without the air cleaner, which can potentially lead to backfires. If it is determined that the carburetor requires an overhaul, options include attempting to overhaul it oneself by obtaining a carburetor rebuild kit and necessary solvent, or obtaining a new or rebuilt carburetor that matches the original. Overhauling a carburetor requires careful disassembly, soaking necessary parts in cleaning solvent, and meticulous reassembly. It is important to follow the specific instructions provided with the carburetor overhaul kit. It should be noted that carburetor designs are constantly modified to meet emissions regulations, so the overhaul procedures may not apply exactly to every vehicle.