1994 Audi CabrioletFACTORY OEM SERVICE PROCEDURE

Fuel Injector Leakage & Volume

  1. Ensure fuel system pressure is okay. See BASIC TESTING article in the ENGINE PERFORMANCE Section. Remove intake air hose between mass airflow sensor and noise damper. Disconnect and move spark plug wires aside to allow fuel rail to be removed.
  2. Disconnect fuel injector connectors. Disconnect vacuum hose from fuel pressure regulator. Remove fuel rail from manifold with injectors attached to fuel rail. Suspend fuel rail with wire. In Output DTM, activate fuel pump relay. See OUTPUT DTM in the G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section. If more than 2 drops of fuel per minute falls from fuel injector, replace fuel injector and "O" ring.
  3. If less than 2 drops of fuel per minute falls from fuel injector, set a clear measuring container under fuel injector to be tested. Connect jumper wire between engine ground and one terminal of fuel injector. For 30 seconds, connect jumper wire between battery positive source and other terminal of fuel injector connector.
  4. If output is 85-100 milliliters, volume is okay. If output is not 85-100 milliliters, replace fuel injector.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.