lownslo

iTrader: (3)

Post all your info here and I will try to keep it updated, along with catch can and routing pics of your vaccum hoses.

I wanted to start this thread to find out why I was having a lean code issue. I Have the oil cap vented through a filter and catch can, but that should be closed off and just have the pcv vented if I am reading correct......

TXSZ66AVLANCHE

iTrader: (7)

If you have the oil cap vented to open air that will give you a CEL for lean.

BlackGMC

iTrader: (31)

here is mine... the catch can is between the manifold fitting and PCV fitting, which is where you want it.. You don't want any of it vented with a breather if your running a MAF... Also I have the fresh air inlet (Passenger side valve cover) after the MAF which is where you want it. I have the hoses tucked behind the fuel rail so they are out of the way.

you can see both in the picture below.

smokeshow

iTrader: (16)

You can have it set up that way, but certain things in your tune may need adjusting to correct for the new air entering the engine. Since your truck has an aftermarket cam you probably didn't even notice the difference in idle, but with a stock cam a PCV vacuum leak would be very noticeable.

I would put the vacuum line back on the intake and valve cover and put the oil filler cap back to stock. I would add a catch can though...IMO, all LS based engines need a catch can on the manifold-valve cover vacuum hose because it is poorly designed and allows oil to enter the intake.

lownslo

iTrader: (3)

so the pcv is on the driver rear valve cover, you run that to the can then from the can to the intake manifold, then on the passenger side you vent from the valve cover to a open air filter right, and block off the port on the tb?

smokeshow

iTrader: (16)

Doesn't the port on the throttle body take the place of the port on the manifold on the older intake manifolds? I haven't looked close enough at them.

lownslo

iTrader: (3)

idk I havent even pulled the engine cover off yet haha

BlackGMC

iTrader: (31)

Dont vent the passenger side to air. Attach it to the port on the TB (99-02) or to the other port on the aide of the manifold (03-07) or to a port after the MAF (TBSS manifold)

lownslo

iTrader: (3)

ok so only use a non vented catch can on the pcv side between the valve and the manifold/tb (wherever it attaches now)?

smokeshow

iTrader: (16)

All right, so the port on the TB is before the throttle blade. You guys and your cable TBs... lol