Hello all,

I have a 1990 4Runner V6 and I am wondering if anyone can tell me what the 2 rubber hoses (connected through a "y" fitting) are for going to the power steering pump?

The rubber hoses do not appear to be pressure or return lines nor do they appear to be carring any fluid. One of the rubber lines has been broken for a while and I want to reconnect it but I dont know where it goes. The other line looks like it is connected to a square valve or a vacuum source of some sort but I cant figure out why the pump would need a vacuum source.


Thanks

 

Those are the p/s idle up vacuum hoses to keep the engine from stalling.

The thing they're attached to is a pressure switch. When the p/s has high pressure, it allows a bit more air to bypass the throttle and bump the idle speed up slightly.

Almost all of the 2000 and older Toyotas have them. Cars, trucks, vans, etc. Recently they've switched to an electrical switch on the cars with ETCS (electric throttle control system).

Fix the vacuum hoses. One runs to the intake manifold, the other one runs to the intake tube before the throttle.

 

Hi Brian,

Thanks for your response. I went and looked under the hood and I did not see any broke or missing hoses at or near the throttle body. I got a mirror and looked along the firewall/back of engine and did not see anything disconnected. The broken hose from the p/s pump is near the 4 vacuum switches on the rt front fenderwell. I looked all around this area too and I did not see any place to attach the broken p/s hose. This mystery hose has to attach somewhere?

I am also getting an "overdrive off" light illuminating on the dash. Do you know what could be causing this?