Checking the fuel injection system

In the fuel injection system, only the main electrical circuits can be checked independently.

Order of execution

1. If the normal operation of the engine is disturbed, first check the condition of the electrical wiring and connectors. Check the condition of the air filter element and the condition and gap of the spark plugs. Check the passage of the crankcase ventilation hoses and the adjustment of the accelerator cable. If the engine is still unstable, check the compression in the engine cylinders.

2. If you suspect a bad fuel injector, clean it.

3. If the engine is still erratic, check the ignition system components.

4. If the problem still persists, check the integrity of the fuses and the condition of the electrical connectors and wiring. The electrical connectors must be free of melted contacts, moisture, corrosion, dirt and other damage.

5. After conducting an independent check, contact a specialized Volkswagen station to diagnose the fuel injection system on special equipment.