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.
1994 Audi S4FACTORY OEM SERVICE PROCEDURE
Idle Speed: Requirements
- No Diagnostic Trouble Codes (DTC) stored in DTC Memory. Check using Scan Tool (VAG 1551). See RETRIEVING FAULT CODES and BASIC SETTING FUNCTION (4) in SELF-DIAGNOSTICS .
- Engine oil temperature 185°F (85°C).
- Throttle Body (TB) in idle position.
- Fuel pressure gauge NOT connected.
- All electrical accessories switched OFF.
Factory Service Tools
Use the Manual With the Right Hardware
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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.