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.
Requirements
Idle Speed: Requirements — 1994 Audi S4 Service Manual & Component Testing >> Idle Control Systems >> Idle Speed >> Requirements 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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.