Where is are all the vacuum hoses sourced? - Toyota Yaris Forums

LtNoogie · 05-17-2009, 02:11 PM

I am wondering if engine vacuum is source at one spot or many places? Does anyone know where all the vacuum hoses lead to?

When I had my car dyno'd the technician t'd off a vacuum hose to see if he could measure boost pressure, which he could not. That makes me think that vacuum is source somewhere after the throttle body but before the S/C blower.

My vacuum/boost gauge is tapped off the intake manifold after the S/C which makes sense.

kurokoma-kun · 05-17-2009, 04:22 PM

Long, there is a sticker under the hood that shows the routing goes from the canister in rear of car, to the VSV vacuum switching valve, to the intake manifold.

The pcv (pos. crankcase vent.) goes from fresh air to crankcase to manifold.

But yes I think he could have pulled off the little hose for your boost gauge and got it from the vacuum fitting in the manifold.

does it even build pressure before that point?

05-17-2009, 02:11 PM	#1
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	Where is are all the vacuum hoses sourced? I am wondering if engine vacuum is source at one spot or many places? Does anyone know where all the vacuum hoses lead to? When I had my car dyno'd the technician t'd off a vacuum hose to see if he could measure boost pressure, which he could not. That makes me think that vacuum is source somewhere after the throttle body but before the S/C blower. My vacuum/boost gauge is tapped off the intake manifold after the S/C which makes sense. __________________ aFe Intake \| Blitz Supercharger \| Megan Header \| TRD Exhaust \| NST Pulley Set TRD Shocks/Struts \| Tanabe NF210 Springs \| TRD Sway Bar \| Motegi TRAKLITE wheels \| Kuhmo Ecsta XS R1 Concepts slotted rotors \| Carbotech 1521 brake pads \| stainless steel brake lines \| Seibon vented carbon fiber hood

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05-17-2009, 04:22 PM	#2
kurokoma-kun Drives: 2007 Yaris HB Join Date: Apr 2007 Location: my own little world Posts: 1,256	Long, there is a sticker under the hood that shows the routing goes from the canister in rear of car, to the VSV vacuum switching valve, to the intake manifold. The pcv (pos. crankcase vent.) goes from fresh air to crankcase to manifold. But yes I think he could have pulled off the little hose for your boost gauge and got it from the vacuum fitting in the manifold. does it even build pressure before that point?