any suggestions?

i just bought my 2005 CTS-V with 51k on the clock. everything seems good but i took the intake off to replace the belt and there was some oil at the bottom of the throttle blade.

someone please tell me that these weird little ETBs have some type of oil system for lubrication and i just need a new seal somewhere. it looks like there may be an oil line coming from the front of each cyl. head to the botton of the throttle body, what is it? i dont see any return lines if it is an oil feed.....

my first thought is that im getting blow-by and i need new pistons and rings. im going to pull the PCV hose off and cap it where it goes into the intake behind the ETB and rig up a filter on the PCV pipe. if this stops the oil (and i see oil on the pcv filter) then i guess i know ive got some problems....

any input would be cool
Jeremy

 

The LS1 PCV system will often cause oil in the intake, and that doesn't mean that the motor has problems.
Start by installing a new PCV valve. If that doesn't clean it up to your satisfaction then you could instll an oil catch can like many, including myself do, in the hose just before the TB.

 

That tube is the coolant crossover. It's used because of the dry manifold design.

 

okay, i looked at it again today in the light and i did see a return line for the line that goes into the bottom. there are only two hoses connected to the TB. the one on the top dumps into the passenger side valve cover so i doubt that it is a coolant line.

i capped the intake connection and im gonna see how much oil is coming outta the PCV line.

how much oil usually comes out of the PCV? and why so much? my LT1 and 5.3 tahoe PCV hoses are dry as a bone....

Thanks,
Jeremy