High Fuel Consumption

WARNING: This page is about a different car, the 1993 Volkswagen Passat, 1993 Volkswagen Fox, 1993 Volkswagen EuroVan, 1993 Volkswagen Corrado, and 1993 Volkswagen Cabriolet. However, it is still accessible from the selected car via links, so may be relevant.

Check fuel system for leaks.
Check oxygen sensor control circuit.
Check cold-start valve.
Check injector fuel pressure and volume.
Check airflow sensor lever adjustment and control plunger.
Check throttle potentiometer.
Check injector fuel pressure and volume.
Check full throttle switch.
Check mass airflow sensor (if equipped).
Check intake air preheating system.
Check exhaust system for leaks (between cylinder and oxygen (O2) sensor).
Check ignition timing.