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?

 

maybe when you mess with the rod you are throwing off the TPS. I would leave it disconnected and premix it too see if it is a bad OMP. S4 OMP are nearly bulletproof so i dont think that is the problem IMO. I smoke is from way too much gas, also check the FPR on the vacuum nipple to make sure no gas is leaking into the vac line.

 

the other problem is, withthe OMP attached to the throttle, the motor eats oil.....alot of it

 

Did the plugs all look about the same? Starting to sound like a bad oil injector. Look for a plug with more oil that the rest to help ya find out what injector when bad. Or look at the lines to see if one looks like it is flowing faster that the others.

 

I havent looked at the plugs, but with the OMP hooked up, the car will also miss alot and backfire at high RPMs. I have a spare set of injectors, I guess I could check the ones that are in it to see if they are bad.

 

Easy way to see without doing much it the way of work, disconnect and cap both ends of the big vacuum tube on the front of the TB, going to the spider that has 1 in, and 4 out the provides vacuum to the oil injectors. A tire valve stem cap fits perfect in the large suppy vac tube too if you shove it in backwards BTW. Get some premix and dump in 16 OZ and fill up the tank, oil first , gas second. If you problem is solved it is surely the oil injectors that are the issue.