Ive got a catch can attached to the valve cover 'front right' side and the back left side valve has been blocked by the person who built my engine. Ive been running like this for some time now with no issues but recently my car has been blowing noticeable smoke from the outlet line of my catch can and some light smoke under WOT from the exhaust which also wasn't there before....

Ive been told to unblock the one way valve on the back and route it to the catch can, put a breather on the right side of the cover which i'm going to do, but I though I might get some additional input from on here.

Engine has recently been rebuilt forged internals been over 2000kms without issues, this just sprang up on me.

Help

 

have you maintained the can? i.e emptied and cleaned it? they need regular maintenance.
is the smoke coloured or just steam/vapor looking?
you really need to get that back port vented asap
do you have the catch tank vacuumed?

 

Its light smoke and when im parked and idle its slightly coming out the hood vent...
the catch can outlet goes to atmosphere and the inlet to the valve cover.

 

bump

 

Did you have the head gone back through, i.e. valvestem seals? What was the state of the tune, fuel, etc.? Pulled plugs out yet?

aaron

 

do compression test...and leak down test.

 

We run a big breather on the front corner of the valve cover (I have a pic in my build thread) and then run the PCV with a line to a catch can or free air. I also forgot to ask what the piston to wall was?