Fuel injection system — checking and adjustment (Audi A4 B5)

1. If there is a fault in the fuel injection system, make sure that all electrical connectors are tightly connected and free of corrosion. To make sure that the fault is not due to poor maintenance, check that the air cleaner filter element is clean, that the spark plugs are in good condition and connected correctly. The compression in the cylinders should be normal, and the vacuum hoses should be clean and undamaged. For details, see chapters 1A, 2A or 5B.

2. If the checks do not yield positive results, the car must be presented to a properly equipped dealer station for inspection. The engine management system has a diagnostic connector to which a specialized diagnostic device is connected. With its help, the malfunction can be detected quickly and easily, without checking the system in detail, which takes a lot of time and is very unproductive (especially when the malfunction occurs spontaneously) and increases the risk of damage to the electronic control unit.

3. Experienced car enthusiasts who have a stroboscope and a calibrated gas analyzer can check idle speed and CO content. If the data obtained is outside the prescribed limits, Specifications, the car must be presented to the dealer to find the cause. Mechanical adjustments of the CO composition and idle speed are not provided. Incorrect results indicate a malfunction in the injection system.

(The original version of the article is posted on the website «audimanual.ru»)