Blue smoke under hard acceleration

**ChescoS6** · 05-21-2009 04:04 PM

Driving in to work today I was doing about 75mph and floored it to pass and make a lane change. I looked up into my rearview mirror as I was doing it and noticed a little cloud of blue smoke. Obviously blue smoke would mean I am burning oil right? I checked the oil once I got to work and it may be slightly low, it's 2/3 up the hash marked area. First time I ever noticed this and the car runs great. Only 67k miles on the motor

I had a G60 Corrado that did the same thing to me about 8 years ago except it was a huge amount of blue smoke and turned out the rings were shot and a piston disentegrated

Any suggestions or do you think I have anything to worry about? I'm kinda bummed that there might be a problem. I'm due for a timing belt job soon so if there's something I can replace while that's done to save labor I'm open to input.

It's a 2002 S6 (4.2)

THANKS!

**A62TURBO** · 05-21-2009 04:13 PM

I was ready to tell you that your turbos were going lol It could be a few things, head gasket, valve seat, piston rings etc. Keep an eye out to see if it does it again.

**04A6SLine** · 05-21-2009 04:26 PM

from my Lexus Es300 days,,

Blue means Piston rings..
white means Blown Head GAsket
Black means bad gas..

correct me if i'm wrong..

**loach1** · 05-21-2009 04:55 PM

Possibly a PCV problem that builds up pressure in the crankcase, blowing oil past the valve stem seals and rings. You could slip one of the breather hoses off a valve cover and see if the smoke is still there. With your miles I would think it is a trivial problem, not worn rings or anything major.

**ChescoS6** · 05-21-2009 05:47 PM

That's good to hear. I'll look into that tomorrow. Hopefully that's the issue.

**Coors** · 05-22-2009 07:43 AM

Get the system pressure tested. Focus on the head gaskets and the oil breather system.
I highly doubt you slipped a piston ring. The smoke would be there at idle. It would run like sh&t.

Any lose in power? How's your coolant levels?

**Concentric190** · 05-22-2009 11:45 AM

oil getting in somehow.

do a leak down test, that will rule out rings and valves

clean/check PCV system. check your intake manifold see if there is oil in it.

**ChescoS6** · 05-23-2009 08:56 AM

I removed the PCV valve located at the back of the IM last night. I took it apart and cleaned it thoroughly. It was pretty gummed up inside but the spring looked like it could move freely. I doubt it was causing a problem but it's ruled out for now. I had minimal oil, a thin film, inside the breather hoses coming off the valve on the bottom and side. It didn't look like anything to worry about either. I did a few hard runs on a local highway at WOT and didn't see anything. Maybe I was imagining things.

I had a Pontiac G8 GT behind me on the highway and thought it was a perfect time for a WOT test run. No smoking but I did get reeled in rather quickly by the G8

Anyway, thanks for everyone's input and suggestions!