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.
1989 Audi 90 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Full Throttle Enrichment
- Connect Dwell Meter (VW 1367) to vehicle. Using Adapter Cable (US 1112) connect Green test lead to OXS system test connector (Blue/Black wire). Set "%" button on duty meter.
- Disconnect vacuum hose going to ECU. Remove throttle switch. Start and allow engine to idle. Bridge throttle switch terminals No. 2 and 3. Ensure that duty meter indicates a constant 60% duty cycle. If not, check continuity of throttle switch wiring back to ECU.
Factory Service Tools
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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.