2birdsandz28

i have smoke coming out of my valve cover breather? just wondering i think its bad rings, but could it be vavles, or my pcv. the car is a 2001 ta w/ turboed ls1 stock bore with forged internals and P&P ls1 head and ls6 intake . and my pcv has the check valve and a catch can any ideas will help thanks

Big&Tasty TA

Sounds like blow by to me

XtremeDime

iTrader: (16)

How much smoke? A little is normal, a chimney is not.

rotary1307cc

iTrader: (5)

has it always been this way, or it just changed and has more blow-by than it did previously?

what pistons?

Old Geezer

iTrader: (3)

Time for a leak down test.......

AZZKIKR

iTrader: (2)

Agreed. My ZO6 started to do the same, was about 3 months later I lost ring land #2 and once we pulled the engine apart lands on #5 were cracked as well.

killernoodle

Cracked ring lands or a cracked piston. Or you have way too much gap in your rings.

dre2013

iTrader: (7)

sounds like a cracked ring land.

HydroStream6

iTrader: (16)

Sounds like not enough info to say what's wrong to me. How much smoke are we talkin? Are you sure it's smoke, and not steam? Like asked above, has it changed recently?

A little steam/vapor is normal.

LS1-IROC

iTrader: (4)

I have a 10K mile LS1 with a blower and run dual breathers. At idle you can see steam..at WOT on the dyno I saw a little bit of smoke, very light.

2birdsandz28

thanks every one ill do i leak down test this weekend when i get home

2birdsandz28

i did a leak down test this weekend and i does not look to good
#2 is at 35 % w/ air coming out or dip stick tube and oil cap

#7 is at 33 % w/air coming out of dip stick tube and oil cap

so most likely bad rings, ring lands or cracked piston right could it be a bad head gasket?

mice13

iTrader: (9)

Is it smoking out of the oil dipstick tube also?

Black01M6SS

iTrader: (3)

Ringlands on the two pistons that failed the leakdown test is what I suspect. Like others said, a little is normal but if its enough pressure to blow out the dipstick under boost and has noticeable pressure when you take the oil cap off at idle its time for a leakdown test. If you are getting air blowing out the dipstick tube and oil fill spout running the leakdown test the pressure is going into the crankcase past the rings. Head gasket would either let the air excape out between the head and block, between two cylinders and out the intake or exhaust valve depending on which is open or into the cooling system depending on where its blown. Valves not sealing completely would allow air to excape back into the intake or out the exhaust depending on which valve doesn't seal. Sorry but its time to pull it apart and see what's damaged imo. Probably the ringlands on #2 and #7. Mine was doing the same thing, #7 ringlands were broke when I took it apart after getting the same results from the leakdown test. Air comming out the dipstick tube and oil fill when testing #7. I solved the problem with a new 402 shortblock. I hope you have the money to get her back right.

2birdsandz28

thanks Black01M6ss and every one for your input that is kinda what i was thinking it was just wanted to see if it could be any thing else be i will be going to pull it apart this weekend