Quote:
Originally Posted by ianc
Thanks, good info here. I'm at 60k, running a Cobb tune and logged 15 pounds of boost late last year, so I'm probably ok because the car still feels like an animal to me. ;-)
Would still be nice to be able test the part to see if it's in spec or not though...
ianc
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The OE vacuum hose(with fabric over them) do wear/fray and leak. I would look at all your vacuum lines for leaks. You can use a vacuum pump to check if they are leaking from one end. I would replace them with rubber BMW silicone, vacuum hoses. You can buy this from any BMW dealer by the meter.
N54's have two solenoids and a double vacuum reservoir, while N55 only have one Solenoid and one reservoir.
Perhaps these videos will help you find or show how to test the WG solenoids. They do go bad. But I think its more common for the hoses to wear out and leak.
Also... this thread might be a good read...
http://www.1addicts.com/forums/showthread.php?t=1293630