problem with turbo

[joevodka69]

i'm having this problem with my turbo system. i am getting blue smoke coming out my tail pipe, so i suspected it was the seal. i replaced it with a new turbo and same thing. so now i decided to take off the turbo to see if there was smoke from the eninge but found none. then i put the turbo back on and removed the oil feed line but same problem (smoke from the tail pipe) then i removed the oil return line and no more smoke. ? i'm lost and any info appreicated

 

[tenn-gsx]

You made 2 identical threads buddy.

 

[joevodka69]

any input ?

 

[tenn-gsx]

Again. Your return line is clogged causing it to build pressure behind the oil seals. Clean out or replace the return line.

 

[meliketoball]

If your car has high mileage then your valve guide or stem seals may be old and brittle and leaking into your combustion chamber.

 

[tenn-gsx]

If It was the valve seals tho it wiuld burn oil no matter what. He says It doesnt burn when he removes the turbo oil return line. Doesnt that point to a restriction in the return line?

 

[joevodka69]

i just had the head rebuild its still in the shop with this problem

 

[joevodka69]

but if the feed line isnt hooked up then it wouldnt matter if the return line was clogged

 

[tenn-gsx]

Your right, I miss read the post sorry. Make sure that your crankcase ventalation system is working properly. If it is clogged then you will feel a rush of air pressure when you take off the oil cap. Let the car idle till you see smoke from the exhaust. While car is running remove cap. If crankcase pressure is the problem, the smoke will stop within a few seconds of removing the oil cap.

 

[joevodka69]

when i just have the return line hooked up =smoke
when i have no feed no return = no smoke
when i have just feed line = smoke

do u think too much oil pressure ?

 

[joevodka69]

shouldnt the pcv valve take care off crankcase pressure brb

 

[tenn-gsx]

Doubtful because oil press would be an issue with the return line off still. However with the return line off you are giving the crancase a place to vent the pressure. Hook everything back up and try what I said in previous post.

 

[joevodka69]

ok will have to do tom. at the shop any other ideas?

 

[tenn-gsx]

Nothin I can think of. Maby someone more experienced can chime in. Only other idea i have is bad news. Rings. But again that would be a constant issue. Oil return line wouldnt affect it.

 

[joevodka69]

how do i fix the crankcase ventilation problem it thats what it is? sorry about all the questions but the car has been in the shop for 4 weeks and i got no answers

 

[joevodka69]

did a compresshion test, and couldn't you notice if the rings were bad by looking when the head was off ?

 

[tenn-gsx]

I doubt its the rings. If compression was in specs you shouldnt worry about that. Im pretty sure its crankcase pressure. Your pvc system is probably just messed up.

 

[joevodka69]

does that include just a check valve
i checked it and air only blew in one direction

 

[tenn-gsx]

Yes make sure the air flows freely from valve cover to your intake or catch can, and that you cannot blow air into your valve cover. Your car is a n/t originally so you cannot rely on the stock pvc valve if your hooking the hose to a part of the intake system that sees boost.

 

[joevodka69]

i dont really understand "catchcan"
without pcv going to the intake my car idles very high

 

[tenn-gsx]

Ignore catch can. You obviously dont have one then. Just make sure you have a good free flow of air no restriction from valve cover to intake. That means NO restriction. make sure you cant blow ANY air into the hose. You need to pressurize that hose atleast to the same amount of pressure as the amount of boost your running. You really should TEE that line so that you have one hose on the valve covergoin to a tee, One side of the tee has a line hooked to intake system before the turbo, and the other line hooked to the intake after the throttle body. Both lines need a check valve.

 

[joevodka69]

valve cover = tee
side 1= check valve to manifold
side 2= check valve to turbo ? i dont have any vac lines going the turbo

 

[tenn-gsx]

That is why you Install a tee, then put a line anywhere between the air filter and turbo. This way you still evacuate the vapors under boost and during vacume.

 

[joevodka69]

thanks for all the helpful info if the oil pressure sending unit is broke will oil pressure levels go up should i get an aftermarket one?

 

[tenn-gsx]

A broken sender wont make oil press change. BUT it is always a good idea to have atleast an aftermarket boost and oil prassure gauge as well as a wideband set up.