Part# 17630-15090 control valve on power steering? - Toyota 4Runner Forum

triangles · 04-14-2020, 10:12 PM

Does anyone know what the control valve does that is attached to two vacuum lines? It's on a 2.7L 4cyl if that matters. I broke off the nipples while replacing my belts and see it is an expensive part but for the life of me I can't figure out what it does. it's part# 14 on this diagram Control Valve - Toyota (17630-15090) | Toyota Parts

spartacus · 04-14-2020, 11:12 PM

Quote:

Originally Posted by triangles

Does anyone know what the control valve does that is attached to two vacuum lines? It's on a 2.7L 4cyl if that matters. I broke off the nipples while replacing my belts and see it is an expensive part but for the life of me I can't figure out what it does. it's part# 14 on this diagram Control Valve - Toyota (17630-15090) | Toyota Parts

Air control valves raises the rpm which intern increase the pump pressure helps in steering.
It creates a vacuum when steering wheel is turned raising the rpms. salvage yards will be cheaper.

Kanoe · 04-15-2020, 01:15 AM

I've wondered if this could be eliminated altogether. I only see it having any affect at idle and I don't spend a lot of time at idle wiggling my wheels around. Surely when the rpms are up it would be insignificant.

Try just blocking off the 2 air ports and see how she runs!

triangles · 04-15-2020, 08:33 AM

Thanks I saw that one vacuum line goes before and one after the throttle body. So I assume this somehow reacts to a drop in hydraulic pressure and opens to allow a small amount of air to bypass the throttle body and bring rpm up for more pump power.

I will block off the intake ports for now and if it bogs out at idle I'll eventually get around to snagging one from a junk yard.

triangles · 04-15-2020, 08:13 PM

Well I drove to the store to get some vinyl #10 screw thread protectors to use as caps. They were very tight, Probably could have used 1/4".

The vacuum leak on the way to the store raised warm idle by 200 RPM to 900. After putting the caps on idle went back down to about 700 RPM. I literally noticed no difference so I have no idea what this thing supposedly did but as far as I am concerned it was an unnecessary part.

shazbot · 04-15-2020, 10:27 PM

I cracked those nipple off when I did my celica PS pump years ago, $250 mistake

shazbot · 04-15-2020, 10:29 PM

I think its suppose to help with far turns to the end of the rack, give a idle up at the extremes. Might stall on a 3 point turn, sub 2-300 rpm I think thats why its there

DuendeBubulin · 06-07-2024, 09:31 PM

last month i change the whole steering rack it works for a few days but then i leaks off all the power steering liquid so i took my car back to the shop and ask them to fix the leak, after a very meticulous they found the leak but it was on the control valve, they give me two options the first was to take out the valve and cancel it or found the part wich i tought it would be the best one, i search it on Oreilly and Autozone the price for the part was around $200 dlls, but when i went to Autozone i picture the oem number and found it online for $20 dlls the ten percent of the price, i buy it and in three weeks the part arrive and been working well since then.

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