1979-1993 & 94 Conv [Subscribe to Daily Digest] |
do a compression test. all SB 150 plus or minus a bit, no more than 10% from min to max is good. get the car warmed up and idling with hood open, look a resivor and see if it's getting bubbles from either the big hose to the block or the small hose to the radiator, either is a sign of *possible* slight leak in head gasket, not a for sure. If no bubbles that's a good sign. take the intake hoses off so you can get to the turbine wheel on the intake side, reach in and grasp the nut and try to shake side to side and to pull out and push in.... you should not feel any movement. If you do it's most likely as you suspected, turbo seals and/or bearings. There are rebuild kits for not too much, if the vanes in the turbine have not contacted the housing it should be rebuildable.
ALSO, just a thought, there is a saab lingo "check valve" everyone else PCV valve, on the smaller of the two hoses coming from the two headed fitting on the valve cover, it should pass air towards the throttle body, and yet prevent movement towards the valve cover/the head. If the check valve is missing or AFU, it will all the pressureization of the oil lines to the turbo and usually forces oil around the seal and dumps into the exhaust side of the turbo and creates smoke.... remind you of anyone? check it out, use a clean piece of vacuum hose and put on the valve and blow, do the other side, it should pass one way and not the other (there is often an arrow or a triangle that points the way of the passing flow) make sure the passing directions is *from* the valve cover and *towards* the throttle body... you may get lucky on this one!
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