Measuring the internal engine pressure (B48 and B46 engine) (Cooper S and John Cooper Works)

Special tools required:

NOTE:

NOTE: Create hose piece (1), Ø = 8 x 13 mm, length = 70 mm.
Create hose piece of low pressure line (2), length = 300 mm.

Connect hose piece (1) with low pressure line (2).

Connect low pressure line (2) with the diagnosis connection of the Integrated Measurement Interface Loudspeaker (IMIB).

Connect tube (1) to special tool 11 9 880.

Open oil filler cap.

Insert special tool 11 9 880 hand-tight into oil filler neck opening.

Start engine and run at idle speed.

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Order number of the vacuum hose (IMIB accessory) 81 31 2 468 782 (previously: 81 31 2 357 800 or 81 38 2 201 924)

NOTE: Illustration shows B47 engine.

Different fault patterns as example:

0.97 bar Ambient pressure.

0.95 bar Engine internal pressure normal.

If the deviation is significantly greater than -0.04 bar, the crankcase ventilation system is faulty.

0.80 bar Pressure control valve faulty.

If the deviation is significantly greater than +0.04 bar, the crankcase ventilation system is clogged.

1.07 Clogged ventilation system, e.g. iced up, bar contaminated or kinked vent line.