I have a 97GS, custom turbocharged using the Hahn Super16g @ 7psi. First off, the car runs fine. I still get good gas mileage and general driving doesnt yet seem to be fine. A couple of days ago I was driving around, decelerating in 4th gear, when I heard something pop. Now, at random times, the car seems to be going through about a quart of oil a day. I get the low oil light turning on and off at random times. Wierd thing is that at idle, the car is still seeing 17-20 In.Hg. It seems to be pouring (and I mean pouring... there is usually a huge trail behind my car) oil out of the valve cover breather hose, and the PCV valve also seems to be coated in oil. I havent done a compression check, and everything about this is telling me that I have a blown headgasket or something of that nature. But again, this does not happen all the time. Also, looking under the car there is smoke coming from somewhere between the tranny and the block, towards the front of the block. Oh yeah, the coolant in the overflow tank is still green.

Also, I just checked the intake piping. There is lots of oil in the intake pipe, some on the compressor housing/compressor wheel, a good amount in the lower IC pipes, but none in the upper IC pipes. Could this be a turbo problem perhaps?

Anyone have any ideas?

Well, sounds like you blew up the turbo and/or fried your rings and/or headgasket.

Get a leakdown test and a compression test done and post the results.

Sounds like to me that you may have a broken ring seat, broken ring or a hole in a piston.
I would do a compression check. That should give you a clue as to what has happened.

The only thing that stumps me is if I actually have some internal engine damage, why would there be oil in the intake pipe and the IC pipe? Wouldnt a ring problem cause the idle vac pressure to be somewhere in the 15 inhg and up range? Its strange that this happened during deceleration with 0% throttle. Ill get a compression check tommorow.

You probably busted the turbo at the same time.

I hate to say it butit sounds like you cracked a piston or ring land. That is exactly what happened to me, then I did a compression test with very bad results. I had oil spewing out the breather filter like the Exxon Valdez. Hopefully you didn't mess the turbo up either.

The turbo is fine. The out-of-the-box HRC install instructions plumb the breater into the turbo inlet pipe. if he's spraying oil out of the breather, it's going into the compressor.

Originally posted by DarkOne
The turbo is fine. The out-of-the-box HRC install instructions plumb the breater into the turbo inlet pipe. if he's spraying oil out of the breather, it's going into the compressor.

what are you talking about, no it doesnt