smoking engine test results

[Frickadella]

So I got a compressor and did a BLT and LDT. I found the throttle body to elbow flange leaking ever so slightly. I'm not sure it's enough to cause so much oil smoke. What was more noticeable however, was that most of the air was escaping through the valve cover. Anyone have experience with this? I'm thinking turbo piston ring seal, though it was probably dry since it hasn't run in weeks.
(Going to replace TB gasket).

Any thoughts? Thanks.


Leak down was spot on, just around 5% leakage each cylinder.

Original post:
http://www.dsmtuners.com/forums/newbie-forum/409651-rebuilt-engine-smoking-oil.html

 

[doubleclutch]

I just looked at a car with the same problem. A lot of pressure out of the head makes me think piston rings....just my opinion

 

[B00st3d_Eg0]

yes this is correct, the only way you should be getting boost leaking out the valve cover is if you have blow-by issues. do a compression check and see what your spread is

 

[Frickadella]

Compression Test : 185, 190, 185, 185 (warm, WOT, all plugs removed)

and again, the leak down test showed around 5%, well within spec.

 

[miguelmcv]

Check your PCV.

If it is bad, It can bring the Boost into the Valve Cover, (Crank Case).

Adding a Catch Can, could be a good fix for your problem, (if you have too much or Crank Case PRS).

 

[brownfinger]

Mine's valve stem seals. PCV will do it to ya, too. My turbo leaks a little, but the engine smokes crazy at idle, intermittently. The engine leaves a big puddle in the driveway, and big evil clouds of smoke in inappropriate social settings, yet the oil pan is always nice and full of good, pure, motor oil. The car is my ugly, rattle-canned, rusted, smashed beater. So I do nothing about it. If it were my pretty car, I'd probably fix it. The owners manual has some insane oil consumption figure: You really don't need to rebuild until oil consumption exceeds 1 QT. per 500 miles. But what would Mitsubishi know about our engines? If it's valve stem seals, I'd just spend my time and money occasionally wiping off the rear bumper, until such time as some other reason to pull the cams came up.

 

[Pauls99Gst]

I have the same issue and iv been trying to read up on it. I just rebuilt my bottom end wiseco eagle setup, Ring gaps are bigger than I wanted but went to big on one, they are .021 top .025 second. The head was just rebuilt by a reputable local head shop, I did put in some advance auto valve stem seals and im almost starting to lean that way. when the car is cold it hardly smokes but once it start to warm up it starts to smoke. give it a few quick throttle blips and huge clouds. 100miles are on the rings now I dont know if my comp gauge is right but it was 150 across the board and didnt find any noticable boost leaks after a blt. turbo has very little shaft play but Borgs are known for it.

reason im thinking its not the turbo is because on the spark plugs i have oil around the rim but the coils are nice and white. Can valve stem seals cause your plugs to have oil on the rim??

 

[Frickadella]

Long time to get back to this problem but for the sake of being informative, it turned out to be the turbo. It wasn't bad seals, but the exhaust drain passage and "galley" or groove around the inside diameter of the exhaust side was completely coked up. The passage was about 75% choked off. I couldn't even tell how bad it was until I had chipped it all away. It's amazing this problem wasn't showing signs before my engine rebuild.