Quote:
Originally Posted by F90bmwmastertech
No theyre just a solenoid that controls oil flow to the vanos central bolt. they do not require the engine to be timed to replaced. The charge air coolers come off and they are easily accessible. Again the dme software is the most likely culprit but the valves do fail as well as possibly wrong oil/old contaminated oil can clog the solenoids.
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Ah, I see, you are referring to solenoid actuators. I thought you were talking about vanos central valves that facilitate camshaft mounting and oil distribution. Wouldn't these central valves be the main suspect in oil contamination case, seeing as these have integrated filter mesh and and plunger in those valves handle the oil flow. Solenoid actuator does nothing more than move central valve's plunger with its piston.