Doc67 had a pressurized manifold and traced his problem to the PTC nipple valve which was cloggged. I brought this item to the problem list because all of the turbos since 1990 have a PTC and they tend to get clogged during cold weather.

"The PTC Nipple is mounted in the cold air intake pipe that runs from the air filter box to the turbo. It is in the elbow of the pipe, nearest the turbo. It has two vacumm hoses connected that run back to the oil trap. There is also an electrical connector. It looks like your typical piece of electical mumbo jumbo stuff. It is not very large, about the size of a spark plug.

I am not sure what its actual function is, but it passes the crank case gases back into the engine to be burned. I have been told that it may be a device to heat the gases when the engine is cold. Regardless, mine was blocked and I had way too much pressure in the crank case, causing oil to blow from the filler cap."

I hope we all learn from each other,

Klaus

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98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)