The end of the blacky- COMPRESSION TEST RESULTS :(
03-06-2005, 04:54 PM
#61
Wel there's not much to it Rock. The oil seperator is little more than a plastic bucket into which crankcase fumes pass on thier way to the J-boot. The idea is that oil that gets in it will drain to the bottom and back into the crankcase. Under normal conditions, that is what happens and only combustion blowby vapors make thier way back into the intake to be burned (this is known as positive crankcase ventilation). But if for some reason the crankcase is excessively pressurized (or maybe the oil level is too high), oil doesn't all drain in the breather; some gets pulled through the hose to the J-boot, mixed with air and burned. What causes excessive crankcase pressure? Usually worn piston rings.
03-06-2005, 05:08 PM
#62
Lazer Beam Shooter
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Plugs were silverstones and are tosted with black soot
I think im calling bad air/oil seperator on this.
Heres what ive found, there is a huge oil leak that is draining down right below the air/oil seperator. There is also oil all over the underside of the manifold, and even on the fuel rail above the seperator.
The smoke entering the cabin looks like the oil that was spat up from the leaking seperator was tossed onto the engine, where it burned and smoked me up good. Since oil pressure is highest when the car is under load, and the problem only happens when the car is under load, i think the pressure is not enough for the old air/oil seperator to hold back and is going all over the engine and smoking pretty good.
The oil then must have been sucked through the vaccum line, into the combustion chamber, and caused the white smoke to come through the exhaust pipe. This also must have caused that huge backfire.
ANd that is Dr. Rocks theory
I think im calling bad air/oil seperator on this.
Heres what ive found, there is a huge oil leak that is draining down right below the air/oil seperator. There is also oil all over the underside of the manifold, and even on the fuel rail above the seperator.
The smoke entering the cabin looks like the oil that was spat up from the leaking seperator was tossed onto the engine, where it burned and smoked me up good. Since oil pressure is highest when the car is under load, and the problem only happens when the car is under load, i think the pressure is not enough for the old air/oil seperator to hold back and is going all over the engine and smoking pretty good.
The oil then must have been sucked through the vaccum line, into the combustion chamber, and caused the white smoke to come through the exhaust pipe. This also must have caused that huge backfire.
ANd that is Dr. Rocks theory
03-06-2005, 05:17 PM
#64
Lazer Beam Shooter
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I support my claim with evidence. This may also be why there are oil leaks all over my driveway, despite previous thoughts that the cracked oil filler would have caused these.
WAS oil, now there is a swimming pool
WAS oil, now there is a swimming pool
03-06-2005, 05:29 PM
#68
Nerd Herder
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Originally Posted by Dmitry S.
Uhhhh. Stop pouring oil into the airbox and start pouring it into the engine.
03-06-2005, 05:45 PM
#73
Lazer Beam Shooter
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This is a head scratcher indeed. For the oil is not only being forced into the airbox, but it is also being forced out of the air/oil seperator and out of the engine
03-06-2005, 05:54 PM
#74
Rock,
Since this is a problem not many of us have read about before, make sure to keep us all posted as to the ultimate resolution. Maybe make a new clean thread with pics and observations when you are done.
Is the air filter totally soaked with oil now? I assume that a paper filter soaked with motor oil would really deprive the engine of air.
My other question was on the gutted catalytic converter. Was it cleaned out well enough to see from one end to the other? I admit I've never seen a gutted catalytic converter before. Is it possible that a stray piece left in there got lodged in the tailpipe?
BTW, best of luck trying to get the car sorted out and back on the road.
Since this is a problem not many of us have read about before, make sure to keep us all posted as to the ultimate resolution. Maybe make a new clean thread with pics and observations when you are done.
Is the air filter totally soaked with oil now? I assume that a paper filter soaked with motor oil would really deprive the engine of air.
My other question was on the gutted catalytic converter. Was it cleaned out well enough to see from one end to the other? I admit I've never seen a gutted catalytic converter before. Is it possible that a stray piece left in there got lodged in the tailpipe?
BTW, best of luck trying to get the car sorted out and back on the road.
03-06-2005, 06:17 PM
#75
Race Car
Hmm, that is more oil than I have ever seen in the air box!!
One main cause of this, is when people add oil, they just dump it in as fast as they can. The drainage hole in the bottom of the filler tube is quite small. If you fill it too fast, it will actually flow out the top of the air oil seperator, and into the J-boot, then back into the air box, but I've never seen that quantity of oil move in such a fashion, and it should be new clean oil in there if I was right.
I'd be checking out your air/oil seperator first.
The pop was definately a backfire. With that much oil in the intake, I'd be amazed if the DME even knew how much air it was getting, was the pop when you let off the throttle?... If it's running a bit rich, that seems to be when they backfire the most often.
Now, how far up the intake system does the oil extend? Do you have that quantity of oil inside of the intake manifold?
Pull the J-boot, and see where the oil stops. We'll all help you nail this one down.
Just curious, but if you pull the oil filler cap while the engine is running, do you feel a strong breeze coming out of it?
One main cause of this, is when people add oil, they just dump it in as fast as they can. The drainage hole in the bottom of the filler tube is quite small. If you fill it too fast, it will actually flow out the top of the air oil seperator, and into the J-boot, then back into the air box, but I've never seen that quantity of oil move in such a fashion, and it should be new clean oil in there if I was right.
I'd be checking out your air/oil seperator first.
The pop was definately a backfire. With that much oil in the intake, I'd be amazed if the DME even knew how much air it was getting, was the pop when you let off the throttle?... If it's running a bit rich, that seems to be when they backfire the most often.
Now, how far up the intake system does the oil extend? Do you have that quantity of oil inside of the intake manifold?
Pull the J-boot, and see where the oil stops. We'll all help you nail this one down.
Just curious, but if you pull the oil filler cap while the engine is running, do you feel a strong breeze coming out of it?