Positive Crankcase Ventilation: Description and Operation

Crankcase Ventilation, Cleaning

NOTE: As the illustrations in this service information are used for different model years and/or models, some variation may occur. However, the essential information in the illustrations is always correct.

Cleaning the crankcase ventilation

Applies to B5xx4Sx up to model year - 2001.

Remove:

- the oil filler cap
- The vacuum hose for the crankcase ventilation from the nipple at the intake hose.

Blow into the hose and nipple to check that they are open.

If there is no air flow, remove the hoses and nipples for cleaning.