Crankcase Ventilation System Check For 1994-2007 BMW Engines

Short Description
All current BMW engines (M42 (from 1/94), M44, M52, S52, M60, M62 and M73 engines) incorporate a pressure-controlled crankcase ventilation system. If oil consumption issues are being diagnosed, this information can be helpful. The crankcase ventilation systems use various crankcase ventilation valves depending on the engine type as shown in Figure 1 below.

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Content
Although the valves all look different, they function similarly using a spring and diaphragm assembly to control the crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum (approximately 10 - 15 mbar) in the crankcase which ensures reliable crankcase venting during all engine operating conditions.
A malfunctioning crankcase ventilation valve may cause the following complaints:
• Engine runs rough;
• Whistling noise from crankcase ventilation valve; and
• Check engine light on - possible DME faults stored: misfire all cylinders, oxygen sensor/mixture faults, etc.
To assist in troubleshooting the above complaints a special tool (p/n 99 00 0 001 410) has been developed to quickly check a pressure controlled crankcase ventilation system. Also refer to service information bulletin number 04 08 98 for further information regarding the slack tube manometer tool.
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