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 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECOMPRESSION CHECKTESTING AND INSPECTION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Compression Check: Testing and Inspection
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Testing and Inspection
1. Engine warm, oil temperature at least 30°C (86°F).
2. Throttle valve fully open during cranking
3. Disconnect harness connectors from ignition coil power output stage and from all six fuel injectors.
4. Use compression pressure recorder tool No. VAG 1381 together with adapter tool No. 1381/5, or equivalents, to measure compression.
NOTE: Refer to operating instructions for use of the recorder.
5. Operate starter until tester shows no additional increase in pressure.
Compression pressures:
New: 9-14 bar (131-203 psi).
Wear limit: 7.5 bar (109 psi).
Maximum permissible pressure difference between all cylinders: 3 bar (44 psi).
NOTE: If the test values are not within the specifications, recheck compression pressure after a test drive.
2. Throttle valve fully open during cranking
3. Disconnect harness connectors from ignition coil power output stage and from all six fuel injectors.
4. Use compression pressure recorder tool No. VAG 1381 together with adapter tool No. 1381/5, or equivalents, to measure compression.
NOTE: Refer to operating instructions for use of the recorder.
5. Operate starter until tester shows no additional increase in pressure.
Compression pressures:
New: 9-14 bar (131-203 psi).
Wear limit: 7.5 bar (109 psi).
Maximum permissible pressure difference between all cylinders: 3 bar (44 psi).
NOTE: If the test values are not within the specifications, recheck compression pressure after a test drive.
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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.