Power steering vacuum hoses

[Z2TT]

Hello,


On my 1g-gte I traced a couple of vacuum hoses just to see where they go. There is a little hose that comes off the inter cooler pipe and there is also another one that comes off the intake manifold and runs across the front of the engine and meets the hose that comes off the inter cooler pipe. Then they both run downward and go into the power steering system by the looks of it.

I just want to know what is the function of the vacuum hoses that go into the power steering system, and what would happen if they were taken off for example.

Thanks.

[AE35]

Did the Soarer come out with Variable Power Steering at all?

[allencr]

Hello,


On my 1g-gte I traced a couple of vacuum hoses just to see where they go. There is a little hose that comes off the inter cooler pipe and there is also another one that comes off the intake manifold and runs across the front of the engine and meets the hose that comes off the inter cooler pipe. Then they both run downward and go into the power steering system by the looks of it.

I just want to know what is the function of the vacuum hoses that go into the power steering system, and what would happen if they were taken off for example.

Thanks.

Suck It And See! It should be a road speed sensitive control for the amount of 'power assist' if I'm guessing right, but vacuum wouldn't be a very good indicator to control that.
I really doubt that it will cause a [color=red] A HORRIBLE FLAMING DEATH or destroy valuable & important machinery. Test it in places without danger to innocent people!
Clamp a hose, preferably vacuum( If the "T" in 1g-gte is "TURBO", then I don't know about anything about it being a 'vacuum' hose) with anything hard enough to crush but smooth& curved enough to not damage the vacuum hose. If the hose can't take it & gets damaged, it wasn't in good condition and should have been replaced a long time ago anyway.

[Z2TT]

So is that a reading that the power steering system gets so it knows how to adjust itself, preferably to give less power assist at high speeds to prevent losing control of your car?

If so, how can it adjust itself by vacuum reading? I don't think there's anything electronic in there, or are there some sort of actuators?

[allencr]

So is that a reading that the power steering system gets so it knows how to adjust itself, preferably to give less power assist at high speeds to prevent losing control of your car?

I don't know.
IIRC, some others have said that its an 'idle up' for easier parking & preventing stalling.

[takai]

If they run to the PS pump then they will run to a valve on the pump body which allows air through when pressure increases. I.e. when you are turning the wheel.

Funnily enough turning the wheel on a PS equipped car increases the load on the pump which increases the load on the engine. If the car is at idle this can stall the car.... solution, add air....

[Z2TT]

So are you saying when the pressure in the power steering pump increases, it will allow air to flow through the vacuum tubes toward the intake manifold?

[mr2gze]

So are you saying when the pressure in the power steering pump increases, it will allow air to flow through the vacuum tubes toward the intake manifold?

Yes mate, this is exactly what happens. There is a hydraulically operated air valve on either the rack or pump itself. When the pressure exceeds a certain level the air valve will open and air will flow through the vacuum lines, bypass a closed throttle and go straight into the engine. Increasing rpm and preventing stall.

Apparently the system will only reach this predefined pressure level when the wheel is turned to lock.

Check this document here out @ page 12. http://www.autoshop101.com/forms/h21.pdf

Cheers

[Z2TT]

Ah thanks,

So why is there TWO lines running to the pump. One vacuum line comes from the intercooler pipe near the turbo before the intercooler, and the other line comes from the intake manifold.