from elsewhere:
Quote:
Originally Posted by ard;
every BMW motor with VANOS valve control will eventually suffer from 'vanos solenoid issues'....some more than others.
the basic issue is that the solenoids- which are bathed in high pressure oil- become fouled over time, causing sluggish operation. In addition the o-ring seals around them become hard and can leak, allowing opil to bypass.
As a result the operation becomes sluggish.
Eventually they will trip a code..eventually.
In the S62 world we have learned that cleaning the solenoids and replacing seals is a maintenance item.
There is a functional VANOS test- available on the GT1, Autogenuity, etc systems- that will actuate the vanos and report how quickly and completely they move. It is usually obvious when one isnt operating properly. Indeed it is common for 8 YO cars to not throw a code but to still fail this vanos test.
Not sure about these motors, but thought this might be useful...
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agree that scanning the DME with something way more involved than a OBD code reader is the way to go...