BOV is not opening

[eagelfan92]

Friend has a 2g with a greddy BOV on it and it wont open and causing compressor surge. the adjustment screw is loose and you can compress the spring by hand when it is off. any ideas why its not opening?

 

[007jimmy]

Is the line bent/kinked? You have your vacuum source hooked directly to the intake manifold also? Another possibility is a bad diaphram inside the BOV..

 

[JusMX141]

Diaphragm's torn. Replace it with a 1G valve and never worry again.

 

[eagelfan92]

He said the bov is hooked up to this black thing. first it goes to a split and one part of the split goes int othe firewall to his boost gauge then the other split goes t othat black thing.

I thought the boost gauge gets hooked up to the exhaust mani? so wtf is going on with this set up hes got going on

 

[KyleClyne]

Maybe needs a better vacuum source?

 

[oneslowwdsm]

wtf? The BOV line is to be hooked up from a source on your intake manifold and that is it. Absolutely nothing else should be tee'd in that line.

 

[zcoh2gdsm]

Diaphragm's torn. Replace it with a 1G valve and never worry again.

x2. i dont think it's the vacuum source is it's that easy to compress and still not opening.

 

[JusMX141]

He said the bov is hooked up to this black thing. first it goes to a split and one part of the split goes int othe firewall to his boost gauge then the other split goes t othat black thing.

The BOV should have it's own dedicated line to the intake manifold, not the throttle body. You may need to drill/tap a new source if necessary.

I thought the boost gauge gets hooked up to the exhaust mani?

Wow.

 

[eagelfan92]

Wow.

is that not correct?

 

[re-rx7]

Either this is trolling or wow.

 

[eagelfan92]

Either this is trolling or wow.

im just saying what my friend is saying. he bought this car as is so idk how everything is done

 

[GRAVEDIGGER]

is that not correct?

The BOV should have it's own dedicated line to the intake manifold, not the throttle body. You may need to drill/tap a new source if necessary.

Read.... and repeat if necessary.

 

[eagelfan92]

Read.... and repeat if necessary.

I understand how a BOV should be. I dont understand why or how his boost gauge/ bov setup was conceived or how its even really working.

 

[JusMX141]

is that not correct?

Not quite.

There is no boost to monitor in the exhaust manifold. The exhaust inside the manifold is pressurized, sure....but it's also 1500*.

Boost pressure can be metered at the intake manifold or anywhere in the charge piping between the turbo and engine...although if your gauge displays vacuum as well, the gauge will need to be plumbed between the throttle body and engine.

 

[GRAVEDIGGER]

I understand how a BOV should be. I dont understand why or how his boost gauge/ bov setup was conceived or how its even really working.

It's not working... Isn't that the problem? It's routed wrong.

It needs to be routed directly from the intake manifold like was previously stated.

 

[eagelfan92]

It's not working... Isn't that the problem? It's routed wrong.

It needs to be routed directly from the intake manifold like was previously stated.

now hes saying it worked before til he came to colorado and now it stopped. so im guessing like previously stated the diaphram probably quit on him

 

[GRAVEDIGGER]

now hes saying it worked before til he came to colorado and now it stopped. so im guessing like previously stated the diaphram probably quit on him

Yep, probably... Time to get a new one and route it correctly.

 

[honda_burner]

is that not correct?

Im gonna go ahead and say no.

 

[fierosail]

reading this made my head hurt