Needing some help finding a vacuum leak

[Pizzarolls4]

There's a solenoid too but not exactly sure how it all works together and if it's even good

 

[Pizzarolls4]

I had to dig back in my photo archives but it looks like your hoses are hooked up like mine except I just put a breather on the valve cover.

I guess u question the breather being a band-aid to something more going on lol why did u add tht?

 

[Pizzarolls4]

I had to dig back in my photo archives but it looks like your hoses are hooked up like mine except I just put a breather on the valve cover.

*I question

 

[escapepilot]

*I question

Mostly cosmetics.

 

[devianteng]

There's a solenoid too but not exactly sure how it all works together and if it's even good

If the bypass valve solenoid is bad, you'd only be boosting about 3.5psi. This is something I was dealing with earlier this week. Easiest test is to bypass this solenoid; disconnect the vacuum line on the bypass valve (the canister on the supercharger) that goes to the solenoid, and put a bolt in it effectively blocking it off. This is the easiest test if your LSJ isn't boosting beyond ~4psi.

 

[Pizzarolls4]

If the bypass valve solenoid is bad, you'd only be boosting about 3.5psi. This is something I was dealing with earlier this week. Easiest test is to bypass this solenoid; disconnect the vacuum line on the bypass valve (the canister on the supercharger) that goes to the solenoid, and put a bolt in it effectively blocking it off. This is the easiest test if your LSJ isn't boosting beyond ~4psi.

I swapped the solenoid off my daily driven lsj that boosts correctly issue is still present. I even took off the bypass valve and depressed plunger then put my finger over top and bottom port to verify its holding vacuum so I don't think anything is wrong in the system.

 

[Pizzarolls4]

If the bypass valve solenoid is bad, you'd only be boosting about 3.5psi. This is something I was dealing with earlier this week. Easiest test is to bypass this solenoid; disconnect the vacuum line on the bypass valve (the canister on the supercharger) that goes to the solenoid, and put a bolt in it effectively blocking it off. This is the easiest test if your LSJ isn't boosting beyond ~4psi.

Also I don't actually know what my boost level is no gauge is connected I have an aeroforce but haven't installed it yet and not sure if it reads boost?

 

[escapepilot]

Have you confirmed that air is trying to escape the crankcase?

 

[Pizzarolls4]

Have you confirmed that air is trying to escape the crankcase?

I actually ripped the IM off and lightly blew air through pcv nipple on back of VC make sure there isn't a blockage and it's not blocked air escapes through hole on SC side. I blew through one end of pcv valve and air passes through blew through other end and it doesn't which I believe says the valve is good even though it's brand new.
I also ran a compression test 190psi across all 4 cylinders.
Once it's back together I'll try to see if it's blowing or sucking vacuum.

 

[Pizzarolls4]

Have you confirmed that air is trying to escape the crankcase?

Also blew smoke through nipple on back of VC to verify spark plug and VC gasket isn't leaking.

 

[Pizzarolls4]

Also blew smoke through nipple on back of VC to verify spark plug and VC gasket isn't leaking.

With coils out

 

[Pizzarolls4]

Have you confirmed that air is trying to escape the crankcase?

With oil cap off to me it looks like it's blowing the smoke away and holding my hand over it feel air

 

[escapepilot]

That narrows down some possibilities. I think Ross may be on the right track with the PVC system. You did service it, so it is possible something was installed backwards or hooked up wrong I suppose. If not that, next likely would be blow by. Leak down test will confirm or eliminate that. If neither of those, I’m at a loss for other ideas.

 

[Pizzarolls4]

That narrows down some possibilities. I think Ross may be on the right track with the PVC system. You did service it, so it is possible something was installed backwards or hooked up wrong I suppose. If not that, next likely would be blow by. Leak down test will confirm or eliminate that. If neither of those, I’m at a loss for other ideas.

As far as I can tell the pcv system is working correctly I checked the valve and made sure it was seated fully when IM was off. While IM was off I lightly blew compressed air through the nipple on back of VC to verify that the path was unblocked all the way to where the pcv valve mounts against head.
I will do the leak down test next even though my compression test numbers were healthy.

 

[Keckster]

Do you have a boost gauge installed or hptuners to check what the vacuum is at idle?

 

[Pizzarolls4]

Do you have a boost gauge installed or hptuners to check what the vacuum is at idle?

I have a aeroforce interceptor gauge just haven't plugged it in yet not sure if it will read boost or vacuum

 

[Pizzarolls4]

Do you have a boost gauge installed or hptuners to check what the vacuum is at idle?

If it does what sort of numbers should be I seeing on both? Stock pulley

 

[Rauq]

~45kPa for me at idle. Pulley size shouldn't make a difference, even if the bypass valve is stuck open or closed, I wouldn't think.

 

[Pizzarolls4]

~45kPa for me at idle. Pulley size shouldn't make a difference, even if the bypass valve is stuck open or closed, I wouldn't think.

Keckster mentioned boost level as well that's only reason I asked about boost numbers expected.
Are u able to describe how I bypass the bypass valve and solenoid? I want to eliminate that's the issue

 

[Keckster]

Yup most cars run around 45kpa at idle. If you have a larger cam installed it could be lower. I chased a vac leak forever cause my car was only drawing about 55-60 kpa at idle but I have a larger cam making the engine less efficient in that range so it is normal.