Sh*t, blue smoke!!!

[mhrallyteam]

I need your advices on that.

When i start there is a big blue puff of smoke coming out of my exhaust. Only once, then nothing more.

I guess turbo seals are leakin', or could it be one of my piston ring letting some oil pass by when my car is parked for a while.

So what do you guys think about that, it sure doesn't look sharp when a start with people around.

[dzx]

My car has done that once or twice. I think it could be the turbo you are running is putting strain on the blowby system and as it recirculates into the intake, it sends oil into the intake side of the turbo so when you start up, the oil is burned. When i had the intake off i noticed a little pool of oil sitting in the 90 degree inlet. Just my guess as to whats happening tho.

[legacy92ej22t]

My car was doing that recently. I finally did a compression test and #4 was blown to hell. I'd do a compression test imediately.

[mhrallyteam]

Exactly what i don't wanna hear. I've just put the engine in my car 3months ago. I don't want to pull it out to start all over again.

I cant afford that.

If my compression is bad, i would notice by having crankcase pressure. How much pressure should come out of the breather tube during normal operation

[entirelyturbo]

It doesn't blow any blue smoke when you get on it? Have a friend drive the car away from you and tell him to mash it.

My Legacy popped a puff of blue smoke out when my friend shifted from 1-2 pretty spiritedly...

I switched back to full dino oil from the partial synth I was using and it completely and totally stopped burning any oil.

[legacy92ej22t]

Mine didn't smoke except right at start up and #4 is bad. It would blow a big blue cloud right at start up and then wouldn't smoke at all after that until the car sat again for at least 6 hours.

I'm not trying to scare you or anything and I truely hope it's something else. I just think the first thing you should do is check your compression so that you can have piece of mind if it comes out ok.

I don't know what the crankcase pressure is supposed to be either, sorry.

[professor]

a compression test will tell you if you have a big problem with a piston, rings, or valve. If a squirt of oil into the hole brings up the compression an a low cylinder, then rings are likely. if not, valve or piston damage.

Your crankcase should have negative pressure, so little or nothing should blow into your face when you pull off the oil cap or dispstick.

A puff of blue smoke could just as easily be the afore-mentioned turbo problems, or PCV issues blowing oil around to the intake, or a bad valve seal. It doesn't mean a huge problem, necessarily.