Just cleaned the throttle body a while back and the milage went up about 3mpg or so. After a third tank mileage is back down to 16, ordered a oil catch can this weekend, hopefully it will help resolve the issue. I have read numerous post on the catch cans, but never really saw a clear answer on how it needs to be hooked up. I have a naturally aspirated 02, 5.3.. Does the can go before or after the pcv valve? I know it needs to be in line to the throttle body and does not need a breather due to vacuum. Which is right?

 

It goes After the PCV..

Run a hose from the PCV to the catch can, then a hose from the catch can to the Intake manifold.

What can did you get?
Ive been lookin for something but i dont want to spend too much money.

 

I actually found a polished Weapon R for about $50 bucks shipped. They have a 24 oz and a 16 oz I believe. I got the 24. It is a universal fit. Appeared to be best for the money from what I was able to find. Weapon R is known for import stuff, but as long as it works I dont care!

 

mind PMing me a link??

 

can you pm me that link? damn what a deal!

 

I don't think you can go wrong with any style of catch can. As long as the intake and exhaust are divided by some type of barrier on the inside and the oil vapors have something to collect on. The best think to do is buy one that you can disassembly/modify. Here is a post up of the one I bought/modified even though I never really had an oil burning problem.
https://www.performancetrucks.net/fo...d.php?t=436990
I just recently picked up another cylindrical one from ebay (for my dad's truck) but it was cheaply made and didn't look like the picture so I complained and got 50% off. Ended up paying $15 which made it look a little better.

 

SilverDog I saw your post on that when I was researching the subject. Hopefully this one is made so as to where I dont need to do that. $50 could go either way. Excellent post by the way.

 

Well here ya go. Right now I have it mounted to the brake fluid res. with zip ties. I will eventually mount it with a bracket or something. As far as the hoses go, the ones that came with it are fairly soft. They kind of compress due to the vacuum. Think its a must to get some stiffer lines? The hose that originally came off the pcv valve was steel wrapped in foam.

 

Definitely ditch that hose, looks like it will collapse under vacuum. Some good rubber fuel line style hose should do the trick.

BTW, even with the oil catch can, you will get some carbon build up in the throttle body, it's just a by product of the induction system, especially if your truck is equipped with EGR. But even without EGR some carbon buildup is to be expected. I usually clean my throttle body every 12k, or every time I have the intake tube off.

 

Dude, please stop mis-informing people. Unfortunately, excessive oil consumption through the PCV system of GM GenIII engines has been an ongoing problem since the conception of the LS1. GM has TSB's in reference to it, and has tried to combat the problem by replacing the conventional spring and plunger PCV with a fixed orifice style, that doesn't work. The problem lies within the design of the PCV system and the baffles in the valve cover. I recently read (in another thread) that GM is releasing updated valve covers with a different design baffle that's "supposed" to work (time will tell). Many guys run catch cans on their F-Bodies, Vettes, and trucks. I've been running one for years and get about a tablespoon of oil in it every 500-1000 miles. There's nothing wrong with my engine, this is just a characteristic of the GENIII PCV system design.

Do some research before posting what you "think" is right. Search around the LS1Tech internal section and the many informative threads here, you just might learn something.