1. Make sure the ignition system is OK if the engine does not start or stalls.
2. Check the power supply system and battery charging.
3. Perform a visual check of the condition of the injection system components, including check the condition of the air filter. A dirty or clogged air filter element will significantly affect engine performance.
If, after performing the above actions, the cause of the malfunction has not been established, then read the list of possible malfunctions of the fuel injection system and how to eliminate them, and also contact the workshop to print out the trouble codes registered by the control unit. Based on the information obtained, determine the cause and check the relevant part.
Attention! In the event of a sudden complete failure of the fuel injection system, check the fuses first.
A leak in the intake manifold leads to the entry into the system of «side» air. The amount of this air is not included in the parameters stored in the memory of the electronic control unit and its supply leads to malfunctions in the system. Excess air leads to an uncontrolled lean air-fuel mixture.
4. Check the condition of the hoses intended for vacuum supply, as well as their attachment to the connecting fittings. It is necessary to check all hoses on the injection system and intake manifold (brake booster vacuum hose, heated air supply hose, evaporative emission system hoses).
5. Warm up the engine if it starts but runs erratically or malfunctions, and let it idle. Open the hood at the same time.
6. Spray the injection/engine control unit in the area of the flange on the intake manifold side, the gaskets of the intake manifold pipes, and the hoses of the units that produce reduced pressure with the so-called starting fluid. Disconnect the plugs of the lambda probes.
If, when applying the specified liquid to a certain part, the engine speed increases, then this is the place of air leakage.
7. Make sure the fuel hoses are tight and the wires «masses» (-) firmly fixed.
8. Check that the connection plugs fit properly and that their contacts are not broken or bent. If necessary, spray the contacts with an aerosol to improve contact conductivity. Do not bend the contacts yourself.
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