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.
1988 Audi 5000 CS, StandardFACTORY OEM SERVICE PROCEDURE
Boost Pressure
- To test turbocharging system, use Pressure Gauge (VW 1397). Gauge is equipped with a valve which locks pressure measurement when closed.CAUTION: This operation requires the use of a chassis dynamometer to safely test components. If dynamometer is not available, testing can be simulated with a road test and the correct equipment arrangement.
- Attach gauge to vacuum advance at distributor, using "T" fitting supplied with gauge. Ensure vacuum advance unit and charcoal canister purge valve are free of leaks. Use hose clamps at all connections to avoid low readings.
- Warm engine until oil temperature is above 176°F (80°C). Accelerate engine to 4000 RPM in second gear with automatic transmission (third gear on manual transmission). Hold vehicle speed constant and close gauge shut-off valve. Record reading.NOTE: Testing should not exceed 10 seconds at full boost.
- Boost pressure readings will vary with temperature. Compare results with readings in BOOST PRESSURE SPECIFICATIONS table.
- If boost pressure is incorrect, replace wastegate as a testing measure and retest. If boost pressure is still incorrect, replace turbocharger.
BOOST PRESSURE SPECIFICATIONS
| Ambient Temperature | psi (kg/cm2 ) |
|---|---|
| -4°F (-20°C) | 6.2-6.9 (.43-.49) |
| 14°F (-10°C) | 6.0-6.8 (.42-.48) |
| 32°F (0°C) | 5.9-6.6 (.41-.47) |
| 50°F (10°C) | 5.7-6.5 (.40-.46) |
| 68°F (20°C) | 5.6-6.3 (.39-.45) |
| 86°F (30°C) | 5.3-6.2 (.37-.44) |
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.