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.
2004 Audi A8FACTORY OEM SERVICE PROCEDURE
Engine data
| Code letters | BFM | BGK | |
|---|---|---|---|
| Displacement | ltr. | 4.172 | 4.172 |
| Output | kW at RPM | 246/6000 | 246/6000 |
| Torque | Nm at RPM | 430/3500 | 430/3500 |
| Bore | dia. mm | 84.5 | 84.5 |
| Stroke | mm | 93.0 | 93.0 |
| Compression ratio | 11.0 | 11.0 | |
| RON | 98 unleaded * See note | 98 unleaded * See note | |
| Fuel injection and ignition system | Motronic | Motronic | |
| Ignition sequence | 1-5-4-8-6-3-7-2 | 1-5-4-8-6-3-7-2 | |
| Catalytic converter | yes | yes | |
| Exhaust gas recirculation | no | no | |
| Charging | no | no | |
| Variable valve timing | yes | yes | |
| Variable intake manifold | yes | yes | |
| Secondary air injection (AIR) | yes | yes | |
| Timing at 1 mm valve lift and 0 mm valve lash: | |||
| Intake valve opens after TDC | 25° | 25° | |
| Intake valve closes after BDC | 45° | 45° | |
| Exhaust valve opens before BDC | 38° | 38° | |
| Exhaust valve closes before TDC | 8° | 8° | |
*In exceptional circumstances 95 RON, however with reduced performance
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.