Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 BASE, 2.8 K, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL CONTROLFUEL INJECTOR LEAKAGE & VOLUME
1995 Audi 90 Base, 2.8 K, Automatic
Fuel Injector Leakage & Volume
1995 Audi 90 Base, 2.8 K, AutomaticSECTION Fuel Injector Leakage & Volume
- Ensure fuel system pressure is okay. See BASIC TESTING article. 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.
- 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 DIAGNOSTIC TEST MODE (DTM) under SELF-DIAGNOSTIC TESTS in TESTS W/CODES article. If more than 2 drops of fuel per minute falls from fuel injector, replace fuel injector and "O" ring.
- 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.
- 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.