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The mkiv Supra Owners Club

Power steering pump vacuum valve. Anyone seen this before?


Mgrene
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If I'm not mistaken then that valve will allow air separate to intake air to be pushed into the inlet manifold, so when you steer on idle the revs do not drop too far and stall the engine. I think previously I had the valve not connected at all and didn't really notice a difference. If you have a standalone then you could get around this by getting the standalone to allow more air through IACV when it detects PS is being activated.

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As hydraulic pressure rises above the diaphragm spring pressure in the valve, (as the PAS is loaded up), the ports open and bypass atmospheric air around the throttle plate to add idle RPM to balance the load on the engine. As you say, you probably won't notice much difference, except perhaps on an engine with wild cams that produces sod all torque at idle. Looks like someone has blocked off the port with "something to hand".

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