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Test first to see if it's clogged. Here is good test of the PCV system. Do this with the engine off and cool. Get a two-foot length of 5/8 ID hose. (If you buy PCV hose, you can use it later, in conjunction with a three-inch section of 5/8 OD copper pipe from a plumbing store or building site, to relocate the flame trap if you want.) Pull the flame trap assembly off the breather box, and push the new hose over the nipple on the breather box. Take off the oil filler cap, and try to blow by mouth through the hose that you just connected to the breather box. With a new or super clean breather box, you'll be able to easily blow through it. The easier you can blow through it, the easier your crankcase will breathe. Your breath will come out the oil filler cap hole in the valve cover. This test just checks the breather box. Also, check all the hoses and fittings downstream (above) the breather box, and clean or replace any part that is sludged up or clogged. This includes the brass fitting in the manifold where the little hose connects.
If it's clogged, I'd remove it for cleaning or replacement. When I did mine, I removed the intake manifold, and moved the fuel distributor unit toward the fender, but did not remove it. No fuel lines have to be disconnected. I also removed my starter and accessed stuff from underneath but I don't know if that was necessary. While you're in there, you might consider heater hoses, a wiring harness if it needs one, new silicone vacuum lines for sure, and a good cleaning of the electrical connections under the manifold. It wouldn't be a bad idea to give it new injector seals also, but that doesn't have to be part of the same job. And definitely relocate the flame trap. I relocated mine to the front edge of the intake where it is readily accessible. Actually, I'd drive the car a week or so before you dig in to determine whether the thermo time switch and gauge sender are working right. These are tough to replace with the manifold on. The K-Jet non-Turbos are cluttered under the manifold.
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Thanks everyone for all the help, Doug C. 81 242 Brick Off Blocks, turbo bars and wheels, M46; 86 244, B230, 150k , auto.
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