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740t crankcase pressure-stumped! 700

posted by  superglyde on  Mon Apr 18 03:17 CST 2005
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last visit: Mon May 21 09:42 CST 2007
[RELATED]

Okay, on my 90 740t. The car fails the jiggle test. Pulled the small hose from the "non-flame trap" Y, the brass fitting to the manifold is clear. Replaced the hose, but found out the small nipple on the Y was clogged solid. Opened that up, cleaned it. Also ran a tube down to the hose going into the breather box and blew smoke in. Smoke came out the oil filler so the breather box is clear. Replaced the oil cap gasket, and it still has oil coming out of it and fails the jiggle test. It does however, draw a vacuum when you rev the motor up, but at idle there is definitely positive pressure coming OUT of the fill hole.
Drained the intercooler at the large hex bolt, and got less than a teaspoon of oil out of it.
So now I am stumped. Any thoughts?






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