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745i self-leveling troubles, part II (very long) (archive)
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Posted by Afshin on October 21, 2001 at 15:03:56:

Ok guys, there's alot to say and I just don't know where to start with... I was going to check the color of the Pentosin as Bruce asked me and guess what, there was almost nothing left!!! (never checked it since purchased, 3 mounts ago) I had to add a good liter and half on it. I'm amazed because on system there's no leak to see anywhere...
Now it gets really weard, I went for a test-driving right after and there is 2 things, first of all, that weard, loud, BUZZZZZZZ noise from my trunk on every acceleration, disappeared. Sorry guys, that was the noise, that I was thinking was comming from my pump...so, where was it coming from ?!!
Secound thing, I kind of got no shocks any more...the rear end just hooks and jumps and making yo yo with a very strong and bad KLANG noise, on every small bump on the street. An almost dangerous handling...
Back in my garage, I sent my wife and my dad in the trunk (wife's still not happy about it!!!) to do that test that Steve asking me. I turened the key to the ignition position and rightaway, I've heard a sound like GRRRRRR from under the hood that I think is from the pump. Actually you guys are right, it's not possible to hear it when the engine is on...anyway, after having the key on ignition position and waiting about one minute, I had to see that my self leveling doesn't lift the car up (the pump was still running). I turned the key back to the off position and asked my dad and wife to get out of the trunk and then I watched the car lifting back up while they where getting out of the trunk (the normal spring work I guess)

Ok, now the questions please,

What was that BUZZZZZ noise I've had in the trunk after any acceleration? How come it disappeared after adding Pentosin?
How come it needed that much Pentosin (about 2 liters) while I can't detect any leakage..??!!
Why I don't have any shock (like very old, dead normal shocks) working any more right after adding Pentosin?

What would be the next step to get the system back in work please?

My best regards, Afshin.



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