Boost leak question

[talon187]

ok i did a boost leak test today i found two but i think the first one is normal i had air coming out the breather on top of the valuve cover that is normal correct? the other one is at the isc unit is that normal i had bubbles coming for the unit itself and not where it met the intake manifold thanks for the input guys

 

[Spoolin98]

ok i did a boost leak test today i found two but i think the first one is normal i had air coming out the breather on top of the valuve cover that is normal correct? the other one is at the isc unit is that normal i had bubbles coming for the unit itself and not where it met the intake manifold thanks for the input guys

My guess would be a bad PCV valve on the valve cover.

 

[talon187]

umm...not where the pvc is on the left side if your looking at the cover i dont have a line there going to anything just a breather

 

[romeen]

If your PCV is leaking it will allow pressure into the crankcase which then comes out of the breather nipple on the passenger side of the valve cover. So, yes, it definitely sounds like a bad PCV valve.

Since most PCV valves, even the oem ones, leak under boost you can consider getting on of these to put inline between PCV valve and the intake manifold and never have to worry about it again.

Liquid/Gas Check Valves - US Plastic Corporation



For the ISC, you more than likely just need to replace the rubber o-ring that sits between the ISC and the TB.

 

[95CarbonEclipse]

If your PCV is leaking it will allow pressure into the crankcase which then comes out of the breather nipple on the passenger side of the valve cover. So, yes, it definitely sounds like a bad PCV valve.

Since most PCV valves, even the oem ones, leak under boost you can consider getting on of these to put inline between PCV valve and the intake manifold and never have to worry about it again.

Liquid/Gas Check Valves - US Plastic Corporation



For the ISC, you more than likely just need to replace the rubber o-ring that sits between the ISC and the TB.

+1 Couldn't have said it better myself.

 

[talon187]

alright ill have to do somthing about the two leaks i have hrmm. can i take pvc off for now or no ?

the rubber o ring for the isc unit it goes between the intake manifold and the isc correct? anyone know a good place to get a new one ?

 

[turbosax2]

the rubber o ring for the isc unit it goes between the intake manifold and the isc correct? anyone know a good place to get a new one ?

Your local Mitsubishi dealer is a good place to get a new one.

MD614417 - $2.84

https://www.mitsubishiparts.com/oe_parts_catalog.html

The o-ring goes between the isc and the throttle body.

 

[Spoolin98]

alright ill have to do somthing about the two leaks i have hrmm. can i take pvc off for now or no ?

You cant just take the PCV valve off and not put anything in its place.
Buy a new OEM PCV valve, OEM only and replace it.
Buy a new OEM oring or any oring that fits the ISC and replace it.
Boost leak check it again and if the PCV valve is still leaking, then put a check valve in like suggested.
Or you could put a check valve in right away, I just choose not to use one unless needed because thats just one more spot to leak boost.

 

[talon187]

anyone know how much an oem pvc is? im going to try a new o ring in the next day or two ill get one from work there free

 

[95CarbonEclipse]

I highly recommend getting yourself a check valve. Even with a brand new OEM PCV valve, they usually don't last much longer then 3,000 miles (if that). Having the check valve in place will eliminate the need to even buy a new PCV valve.

 

[turbosax2]

anyone know how much an oem pvc is? im going to try a new o ring in the next day or two ill get one from work there free

MD024719 - $4.85