OK so heres the deal.

I have an 87 GXL (going to the scrapyard once I get this problem figured out).

The motor (86K) runs amazing, with one exception. It smokes like crazy.

Now before we say its a blown motor, let me run through what I tested.

I just replaced the plugs (with NGKs) and I noticed the car was very low on oil (it had been sitting for a long time until a few weeks ago when i got it). i put oil in it, and started it up.

Smoked like crazy, blue, but smelled like pure gas coming from the exhaust.

After awhile, it would clean up somewhat.

NOW

This morning I go to start it, and I unhook the linkage to the OMP and then start it. It fires up like a champ, not a bit of smoke in sight. Run it for 5 minutes, then cut it off, and reattach the rod.

Start it up, smokes like hell.

Unhook the rod again, start it up, it burns off excess, then stops smoking.

I took it down the road real fast with no OMP, so I could get some load on the motor, and no smoke.

So I leave the car running, and reattach the OMP linkage again, the car starts to smoke no more than 15 seconds later.

I'm not sure that I understand whats going on here, as it seems like the OMP is pushing too much oil into the intake and housings. I'm fairly certain the internals are in good shape.

Any ideas?

 

Oil control seal o'ring failure is very common for your model year. Add an internal oil leak to OMP feed and you would have too much oil when one or the other isn't too much by it's self. Try a run with no OMP and run the car at high RPM 5-7k engine brake. Basically rev it up to 5-7k in gear and lift the throttle while still in that gear. This would be a high vaccum load on the combustion chamber and would draw an internal oil leak in faster. If it smokes on high RPM decel with no OMP then internal seals may be a likely culprit.

 

no smoke under load after 5K with the OMP disconnected. I dont think the oil control rings are shot.