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2011 CTS-V Sedan
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Discussion Starter #1 (Edited)
Car surges after Catch Can install (with pic)

I bought that catch can from Jegs that someone recommended (forgot who it was). After installing it, my car doesn't seem to idle right. I think I hooked it up wrong. This type of can has the breather on top so I'm not sure if I have to install it different. This is how I installed it. Right side of breather goes to the bottom part of the intake and the left side goes to the plastic intake manifold (top). Can anyone shine a little light on this subject for me before I take it off. :banghead:
 

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I am pretty sure you need to switch the hoses around but unless the can is full it should not make the car surge. vacuum is vacuum. Does the can have a leak?
 

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'04V, '05V, '06SRT8, '10V, '13ZL1, '12 V, '16 Z06 SC757
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On the can I bought the bottom tube feeds the top inlet of the catch can. Can't speak to the Jeg's can.
 

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Lemon Law'd '05 V
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Joey,
Is it the JAZ Mini-breather?..sounds like it is. O.K.- what you need to do is take the mini-filter off...yes, take it off, and plug the hole on top of the can.
You are running lean as a result of the intake sucking air through the mini-filter...you need to stop this asap.
The mini-filter on top is made to exhaust crankcase venting to the atomosphere, not route the air back into the intake manifold. Usually, people connect the valve-cover breathers to the sides of the can and cap-off the return line to the intake.

Our system is made to be a sealed system, one that does not allow air to enter except from the crankcase.

At minimum, if you can't find a proper fitting to plug the top hole, place a few coats of duct-tape over the hole, then fit the breather over and tighten the clamp - this will block the intake from sucking air into the manifold.

What I did was use two 90degree fittings from HomeDepot, the two fittings I used for my air-compressor-mini-filter-catchcan as seen on the FAQ, I used these on the sides. I pulled the urethane press fittings out of the sides and installed one on top, where the mini-filter was and used the black hose-cap to seal the system. (the other press-fitting was used to repair the return nipple on the intake manifold...I pulled off the nipple when I was swapping the hose one day).

The best way, I think to set-up the can, would be to make the crankcase go into one side of the can and then return to the manifold via the top fitting...that way the vapor isn't shot straight through the can from one fitting into the other. Cap the other side of the can and you're good.

Please let me know how things go, I'm in Valley Stream so if you'd like to see how I routed mine, we'll get together.

good luck,
ace
 

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Discussion Starter #5
Yes, it is the JAZ mini breather. It looks great. Thanks for your response ace.

 

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I guess I got a little education this morning. I had never seen one of those.
After doing some research, ace is spot on with this one.

That filter is letting in "unmetered" air. In other words it's getting air into the engine that the computer doesn't know about.
You must remove that filter and plug off it as described if you want it to run right.
 

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Lemon Law'd '05 V
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Joey,
I must say, really nice install!!! The black can looks awesome, I'm a little jealous...I mounted the white, as I wanted to be able to "see" when it was filling up. But the black is worth setting-up an external sight-tube, then one can just look at the tube and see if oil is present. Either that, or mount a dipstick to the plug underneath the filter.
Nice job,
ace
 
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