Procedure
The control unit cannot be checked at home, but in practice it rarely fails. Sensors, switches and plugs break much more often. If there is a malfunction, the following procedure is recommended:
- Make sure the ignition system is in order.
- Check the fuel supply.
- Perform a visual inspection of the injection system components.
- Finally, you should interrogate the memory of the self-diagnostic system. Find in this way the possible cause of the malfunction, check the part suspected of having a malfunction.
Visual inspection
First, check the air hoses for tightness.
All hoses must be checked.
Check the gaskets under the cold start valve and on the injectors, as well as the flange gaskets of the intake ports.
Additional air can penetrate through leaks into the intake system, which is not taken into account by the air quantity meter and therefore disrupts the mixture proportions. The mixture becomes uncontrollably leaner, which leads to engine malfunctions.
Checking the details
Below are described the work on checking the injection system parts, which the car enthusiast can perform independently:
- You should inspect the fuel lines to try to find any leaks.
- Check the plugs on the engine (looseness, corrosion damage and, as a result, unreliable contact).
- Check the plugs on the individual components of the injection system. You can slightly bend the cells with a thin screwdriver.
[The original version of the article is posted on the website «AUDIMANUAL.RU»]