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.
System Test of Vacuum System MSS65
2008 BMW M5 (E60) V10-5.0L (S85)SECTION System Test of Vacuum System MSS65
System Test of Vacuum System MSS65
This system test checks the leak-tightness of the vacuum system as well as the hose line to the idle actuators of cylinder bank 2.
First of all, the system test evaluates the sensor vacuum in relation to the model vacuum. When both vacuum levels have a certain relation, the system test of the engine is switched off.
After an engine-off period of 5 s, the first sensor measured value is determined; the second after 35 s engine-off period. This results in a leak-tightness test time of 30 s. If the system loses less than 5 mbar partial vacuum in this period, the system is regarded as tight.
The run conditions for the system test are:
- Vehicle stationary
- Engine at idle speed
- Catalytic converter heating not active
- Brake pedal not operated
- Electrical vacuum pump not activated
RENDER: 1.0x
NO RELATED
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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.