1992 subaru legacy wagon black smoke

SOURCE: cv joint for a 1992 subaru legacy

Ok here's a couple helpfuls before i start if you have PB Blaster, that works great on spindle bolts. Another thing you will need is a long pry bar (maybe a crowbar if you had to) with a flat tapered end. You will need to remove your tire, spray the PB Blaster on the axle nut, and the 2 spindle bolts going through the strut.remove the axle nut, and the 2 spindle bolts, and seperate the strut from the spindle. Then swing the spindle and push down on it as you remove the axle spline from the hub. Once you do that, check the transmission side of the axle, to see if it has a "doul roll pin" that you need to tap out with a hammer and punch, but it may be the simple locking ring internaly at the end of the splined shaft. Then all you do is pry it back, make sure you have a very firm place to use for leverage, and give it a hard shove and it should pop right out. or you may need to repeat the prying step a few times. When installing the new axle, make sure it's snapped in completely on the transmission side so you don't damage it. Then all you need to do is reassemble it all.
Also when doing this, make sure you support the car by the body, behind the front wheel under the fender/door area. you will need to let the lower controal arm hang to do this.
Hope that does it for you,
Good luck!

SOURCE: b4 blowing plooms of smoke

Assuming that the Smoke is White or Black, You are gonna have to get an Overhaul on that Motor.

SOURCE: How do you replace the fuel pump in 1992 2wd Subaru Legacy Wagon

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Remove the rear exhaust pipe and muffler assembly.
4. On All Wheel Drive (AWD) vehicles, remove the rear differential assembly and the rear crossmember. You do not have AWD so this step is not for you
   
5. Remove the fuel filler cap and drain the fuel into a suitable container.
6. Remove the fuel filler pipe protector.
7. Raise and support the vehicle safely on jackstands.
8. Remove the fuel filler, air vent and delivery hoses.
9. On AWD vehicles, disconnect the air breather hoses and evaporation hose from the pipes.
10. Support the fuel tank with a floor jack or equivalent lifting device.
11. Loosen the attaching bolts and lower the fuel tank slightly.
12. Disconnect the fuel pump harness
    

SOURCE: Steering wheel clicks on 1998 Subaru Legacy Outback wagon

steering column bearing sounds like a worn out steering column... jack the front wheels off the ground both sides relieve load on steering wheel to see if it lessens the amount of feel and noise, if it does it shoud be the column bearing, replace bearings or complete column,,, also try with the wheels off the ground and safely supported to manualy steer the wheels by hand and see if you feel in roughness or hear any noises,should some minor resistance but be smooth in it movement if everything suspension and steering component wise is in good working condition... please rate my help.. thanks...

SOURCE: 1992 Subaru legacy ls wagon w/air suspension. Air

your shocks are leaking or a leak in the lines or pump it has a rolling diaphram when you hit a speed they lower and raise on speed

if you cant find the leak you can pump the strut with a compressor if it has a leak replace it if they are expensive and you wish a cheeper fix you can cap off the front lines or rear or replace all of them with regular coils and struts if off a used car the struts may be bad the spring is heavy and the strut needs to be removed and checked if its bad get new ones they are not cheep but the air ride struts new are a grand or better well they use to be a used one was a few hundred i replaced them with springs on a gl-10 years ago and the light may blink remove the bulb or a wire under the drivers side seat not sure on that year