Lexus Troubleshooting Questions? Ask a Lexus Expert
Are you having to add PS fluid or coolant? Is it over heating?
If it's not overheating and you're not using any coolant this means it's not leaking internally around the head gasket. If you are having to add power steering fluid and there are no external leaks anywhere that diaphragm in that power steering pressure sensor has ruptured allowing power steering fluid to be sucked through the intake manifold and is burning it up in the exhaust. You will need to replace that pressure idle up sensor. To test it just pull the vacuum lines off and plug them and drive the vehicle and see if fluid leaks from the sensor. All this does is boost the idle when sitting still and the wheel is turned.