Checking pop-off valves
WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Remove both pop-off valves
NOTE:
To check the function of the pop-off valves (2), it is necessary to build up vacuum pressure at the valves.
Establish vacuum pressure with the BMW auxiliary diagnosis unit - vacuum.
Establish vacuum pressure with the BMW auxiliary diagnosis unit - vacuum.
Connect vacuum hose (3).
Establish vacuum pressure at 500 mbar.
Plunger (1) must visibly release the opening in the direction of the arrow as far as it will go.
IMPORTANT:
Plunger (1) must maintain this position while vacuum pressure is being created.
If this is not the case, replace the pop-off valve (2).
If this is not the case, replace the pop-off valve (2).
Assemble engine.
Observe BMW diagnosis instructions.