Service Information


• Be sure to relieve the fuel pressure with the engine off.

• Bending or twisting the control cables will impair smooth operation and could causc the cables to stick or bind, resulting in loss of vehicle control.

• Work in a well ventilated area. Smoking or allowing flames or sparks in the work area or where gasoline is stored can cause a fire or explosion.

• Do not apply commercially available carburetor cleaners to the inside uf the throttle bore, which is coated with molybdc num.

• Do not snap the throttle valve from fully open to fully close after the throttle cable has been removed; it may cause incorrect idle operation.

• Seal the cylinder head intake ports with tape or a clean cloth to keep dirt and debris from entering the intake ports after the throttle body has been removed.

• Do not apply excessive force to the fuel pipe on the throttle body while removing or installing the throttle body.

• Do not damage the throttle body. It may cause incorrect throttle and idle valve synchronization.

• Prevent dirt and debris from entering the throttle bore, fuel hose and return hose, clean them using compressed air.

• The throttle body is factory pre-set. Do not disassemble in a way other than shown in this manual.

• Do not loosen or tighten the white painted bolts and screws of the throttle body. Loosening or tightening them can cause throttle and idle valve synchronization failure.

• Do not push the fuel pump base under the fuel tank when the fuel tank is stored.

• Always replace the packing when the fuel pump is removed.

• The programmed fuel injection system is equipped with the Self-Diagnostic System described on page 5-6. If the malfunc tion indicator lamp (MIL) blinks, follow the Self-Diagnostic Procedures to remedy the problem.

• When checking the PGM-FI, always follow the steps in the troubleshooting flow chart (page 5-10).

• The PGM-FI system is provided with fail-safe function to secure a minimum running capability even when there is trouble in the system. When any abnormality is detected by the self-diagnosis function, running capability is secured by making use of the numerical values of a situation preset in advance in the simulated program map. It must be remembered, however, that when any abnormality is detected in four injectors and/or the ignition and cam pulse generator, the fail safe function stops the engine to avoid engine damage.

• A faulty PGM Fl system is often related to poorly connected or corroded connectors. Check those connections before proceeding.

• For fuel reserve sensor inspection, see section 19.

• The vehicle speed sensor sends digital pulse signals to the ECM (PGM-FI unit) for computation. Tor vehicle speed sensor inspection, see section 19.

• When disassembling the programmed fuel injection parts, note the location of the O-rings. Replace them with new ones upon reassembly.

• Before disconnecting the fuel hoses, release the fuel pressure by loosening the fuel hose banjo bolt at the fuel tank.

• Always replace the sealing washers when the fuel hose banjo holt is removed or loosened.

• Use a digital tester for PGM-FI system inspection.

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  • Aapo
    How to remove f4i throttle body?
    8 years ago

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