Locations of possible carbon deposits inside the throttle body
If there is a malfunction in the fuel system, first check that all electrical connectors are securely connected and protected from corrosion. Also check the cleanliness of the air filter, the condition and gap of the spark plugs, the correct adjustment of valve clearances, the compression in the engine cylinders, the setting of the ignition timing and the cleanliness of the air supply hoses to the engine.
1. Remove the air intake tube from the throttle body and check for carbon deposits inside the throttle body (see fig. Locations of possible carbon deposits inside the throttle body). If necessary, use an aerosol solvent to clean up carbon deposits.
2. Using a stethoscope, check the operation of the fuel injectors for the presence of clicks when the injector operates.
3. If you suspect that the fuel injector is not working, connect a tester LED to the fuel injector terminals and check that the LED tester flashes while the engine is running.
4. Remove the electrical connector from the fuel injector and check the resistance of the fuel injector, which should be 13.4-14.2 ohms.
5. If the initial actions do not help to identify a malfunction of the fuel system, then it is necessary to have the fuel system checked and repaired at a service station.