- Are leaks visible on fuel lines?
- Have you disconnected and then reconnected wire connectors several times? Corrosion or unprofessional handling may damage the contacts.
- Carefully inspect the connectors of the individual components of the injection system. Do not bend the contacts, just spray them with contact spray.
- If the engine malfunctions in the idle range, check to see if the engine is sucking in additional air.
Search for a place of admission «additional air»
Leaky sections of the air intake system allow the so-called additional air to pass through, i.e. air that is not included in the calculation of the control unit and therefore significantly disrupts the process of preparing the fuel-working mixture. The amount of fuel in the working mixture is uncontrollably reduced. Most noticeable is the violation at idle by fluctuations in the number of revolutions.
1. Check the vacuum hoses for cracks and the strength of their fastening. Check all hoses connected to the intake manifold (for example, from the brake booster, from the fuel pressure regulator, the solenoid valve of the system, the fuel vapor collection / return system).
2. Warm up the engine, then, leaving it to idle, open the hood.
3. Pour starting fuel from the dispenser (For example, «Startpilot») throttle valve, flange gaskets, inlet ports and piping to units controlled by reduced pressure. To do this, disconnect the lambda probe connector.
4. If the number of revolutions changes when spraying a certain place, then a leaking area has been detected.
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