[cali]

SVA/ PINK VACUUM LINE

What is its purpose?

 

[NeonWaSp]

it serves the same purpose of the BOV. instead of venting to the atmosphere like the BOV it releases the air back into the intake side of the turbo (wow, im answering turbo questions! i rule!)

 

[cali]

it serves the same purpose of the BOV. instead of venting to the atmosphere like the BOV it releases the air back into the intake side of the turbo (wow, im answering turbo questions! i rule!)

Well the line running to it is my problem!!!
I pulled it off and I got 12PSI STEADY!!!
Now I was told my dealer already replaced the Solenoid that controls this valve, and my turbo has been changed....so why?

Where do those other lines on that solenoid lead to/deal with?

 

[NeonWaSp]

i'd have to look at the car but if i had to guess the pink line back traces to one of the solenoids. then the other line prolly runs to the turbo (for vac) or to the brake booster (for vac). dont leave it pulled because itll increase the time for the turbo to spool. you got a lemon dude, take it to the BBB or something and get a different one. it happens, sorry.

 

[Exhaust Depot]

I think that the stock surge valve might not work like most BOV do. This is the first time I have seen a BOV that actually has a solenoid to control it.

For those who dont know how a regular BOV works, this is how:

YOu have two chambers, one that sees what ever the turbo is putting out, and another that sees the pressure/vacuum in the manifold. WHen you are boosting, there is pressure on both chambers. YOu have pressure from the small vacuum hose acting on the valve to stay closed as well as the spring. Now when you get off the gas and the throttle closes, there is not a differential pressure in the BOV. So now you hav a vacuum on one side of the valve and pressure on the other side which causes it to open. THis is how all bov work.

Now, I think the stock surge valve on our car works the opposite way. I think when it sees pressure on one end, it cause the valve to open. I have to check it out when I have time. I just dont see why you would need a solenoid on. The only reason I can see is as a saftey feature if you over boost, it causes the surge valve to open and recirc.

 

[Exhaust Depot]

OH yeah, just for kicks, try swapping the vacuum hoses on your solenoid around. It might be that they have them on there backwards.

 

[Mike B.]

Check the wiring diagram. The SV solenoid gets it's ground from the ASD relay. My theory is that when the engine goes to auto shutdown the solenoid opens and allows the SV to vent.

 

[cali]

Check the wiring diagram. The SV solenoid gets it's ground from the ASD relay. My theory is that when the engine goes to auto shutdown the solenoid opens and allows the SV to vent.

Theres a constant 12V on all three solenoids.
Well 12.5,13.2 & 13.2 to be exact.

What are u calling auto shutdown?

 

[Exhaust Depot]

ASD is the name of the relay that drops power of various items on the car, one being the fuel pump if I recall. Its enabled by the PCM.

 

[Mike B.]

I just dont see why you would need a solenoid on. The only reason I can see is as a saftey feature if you over boost, it causes the surge valve to open and recirc.

This is the same thing that I suspect, just worded it differently. I can't think of any other reason to have the SV solenoid connected to the ASD relay.