New CatchCan Install with Vacuum leak

[Ck1984]

So i installed a new catchcan and immediately noticed a minor vacuum leak on that side.
Not enough to affect idle but noticeable to the ear.

I retaped and , reinstalled all the connections, no change.
Replaced the soft vacum line with steel braided fuel lines, no change.

-it goes away if i just isolate the entire catchcan and plug hose before the catchcan.
-it goes away if i hook up catchcan and plug in hole to catchcan
-BUT soon as i hook up the last hose that goes to pcv valve and valve cover, theres constant vacuum leak

Im now think its coming from the valve cover somewhere.

is carb cleaner the best aerosol based spray that will evaporate without residue to diagnose the leak?

any other ideas where to check or how to fix?

[SlowLS1]

Originally Posted by Ck1984

So i installed a new catchcan and immediately noticed a minor vacuum leak on that side.
Not enough to affect idle but noticeable to the ear.

I retaped and , reinstalled all the connections, no change.
Replaced the soft vacum line with steel braided fuel lines, no change.

-it goes away if i just isolate the entire catchcan and plug hose before the catchcan.
-it goes away if i hook up catchcan and plug in hole to catchcan
-BUT soon as i hook up the last hose that goes to pcv valve and valve cover, theres constant vacuum leak

Im now think its coming from the valve cover somewhere.

is carb cleaner the best aerosol based spray that will evaporate without residue to diagnose the leak?

any other ideas where to check or how to fix?

Could it be resonance in the catch can you are hearing?

Carb cleaner works fine, stating fluid works well also.

Can you post a pic for us to help you better?

[Ck1984]

Originally Posted by SlowLS1

Could it be resonance in the catch can you are hearing?

Carb cleaner works fine, stating fluid works well also.

Can you post a pic for us to help you better?

HAHA, it could very well be JUST RESONANCE as you call it, that would explain why i cant narrow it down with my ears or fingers etc

BUT i will confirm with carb cleaner /starting fluid anyways.

THEN post a pic if i dont find any real leak.

[Lacpac]

Probably resonance. If you move the hose while idling you may hear the resonance change. I twisted mine and retightened to change the pitch.

[ElderJ]

Originally Posted by Ck1984

HAHA, it could very well be JUST RESONANCE

I was just about to ask how you identified the leak, because my catch can setup makes a noticeable hissing noise w/o any leaks. Just the air passing through the hose I'm told.

[Ck1984]

Originally Posted by ElderJ

I was just about to ask how you identified the leak, because my catch can setup makes a noticeable hissing noise w/o any leaks. Just the air passing through the hose I'm told.

yes thats exactly what mine does, general hissing sound in the area.
OH well at least i can be sure all my connections are good now having double checked them all and maxxed out the plumbers tape i could squeeze on all the threads.