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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #1
My vacuum lines were old, hard, cracked, and brittle (18 years in a hot engine compartment will do that to you) so it was time to replace them. Doing it while the engine was out just made it that much easier, this was part of my replacing the manual transmission project. If you still have the original equipment lines it's time, well it's probably past to replace them one and all.

I ordered these on ebay
- 3 meters of 6mm green high temperature silicone line
- 3 meters of 5mm red high temperature silicone line
- 3 meters of 4mm purple high temperature silicone line
- 3 meters of 3mm blue high temperature silicone line

I used almost all of it, I could have ordered 2 meters of the 4mm and 3mm but it's not expensive and I didn't want to run short. I used different colors for different sizes to make it easier to keep track of the sizes, and it looks good.

Advantages of the silicone, it is resistant to heat and most things under the hood except fuel. Don't use it for fuel or fuel vapor lines.

If you have a 2wd you won't need nearly as much 5mm

See photos:
A view of the engine showing vaccum hoses in place - https://drive.google.com/open?id=0B0N4qdhM8CoaUGxCR2RaS2ZCdms
A view of the evap cannister - https://drive.google.com/open?id=0B0N4qdhM8CoaMlhvaWJCQTg0QUU
A view of the engine compartment - https://drive.google.com/open?id=0B0N4qdhM8CoaWk5qTmtQbjdBYTQ
 

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My mechanic is away on the weekend and I want to get my daughters RAV out of the shop... I can't find the hose that attaches to the throttle body... Where does it go?

And which lines go to solenoids?? on the fire wall.

See pics.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #3
The throttle body hose goes to the evap cannister under the master cylinder see the photo of the evap cannister, it's the black fuel line connected next to the air filter. Your's won't have a filter there, it will have a line going to your air intake system. You should use a fuel line because fuel vapors travel through that line.

Those VSVs are for the 4x4 transfer case actuator. See the red vacuum hoses in my photos of the back side of the engine. They have to be connected to the proper locations, I had mine numbered so I don't have an exact photo of where they go. I'll find something and post it shortly.
 
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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #4 (Edited)
Deleted bad YouTube link
 

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I think the hose on the throttle body went down to the charcoal canister.

I see that eodgator already mentioned it.
 

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A charcoal cannister should have two hoses going to it: One to pull vacuum through the charcoal filter, and the other coming from a fuel vapor source, or vent.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #7
A charcoal cannister should have two hoses going to it: One to pull vacuum through the charcoal filter, and the other coming from a fuel vapor source, or vent.
Correct, if you look at my picture you will see a hose coming from/to the fuel tank. The question was about the throttle body hose.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #8
Looking back on it, to prevent confusion for the 4x4 actuator, order different colors of 5mm for each line to color code it and make it easier to hook up right.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #10
The silicone vacuum lines are heat and rot resistant and using different colors allows color coding. Replacing old deteriorated lines if you have leaks, will improve performance whether you use silicone or stock lines. Preventative maintenance is a another reason, if you replace the lines you can prevent many mechanical problems that will cause several different codes to open on the OBDII depending on the systems effected.
 

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Are they all the same size? Or one/size color for one specific line. Another size/color for another hose etc? I think it's a cool upgrade but save us the "figuring out" head ache. In other words; Share your knowledge! :nerd I know I've done this in this forum hundreds of times.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #12
I initially did this one color for each size as follows.
- 3 meters of 6mm green high temperature silicone line
- 3 meters of 5mm red high temperature silicone line
- 3 meters of 4mm purple high temperature silicone line
- 3 meters of 3mm blue high temperature silicone line
Most of the red is 5mm is used on the 4x4 actuator if you don't have a 4x4 you can buy just 1m and have enough.

I had problems with getting the hookups right for the 4x4 actuator so I went back and color coded it.
Red 5mm - hose from the connector off by itself on the actuator (left it red actually because this one is so difficult to get to with the engine installed) to the lower position on the pASSENGER SIDE vsv
Orange 5mm - "0" on the actuator to the upper position on the VSV closest to the driver
Lime Green 5mm - "2" on the actuator to VSV this line splits and one goes to the bottom of the VSV closest to the driver the other end goes to the top of the other VSV
Purple 4mm - unmarked on actuator to intake vacuum splitter
Purple 4mm - intake vacuum splitter to MAP sensor
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #13
I'll try to draw up a vacuum line illustration for the 4x4 actuator.
 
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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #15
Okay, I finally got around to doing the transfer case actuator vacuum line diagram.

 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #16
Vacuum line diagram

 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #17
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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #18
Vacuum line diagrams

Here are the extracted vacuum line illustrations.







 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #19
I noticed that this did not include the power steering pump vacuum hoses for the idle up so here is that info.

The vacuum fitting (17630 - VALVE ASSY, AIR CONTROL) is where the vacuum lines attach to the power steering pump.

The vacuum line listed as 17344G - HOSE, AIR, NO.4 attaches to the above and runs to the hose barb pointing towards the engine on the rigid vacuum pipe (17361G - TUBE, AIR(FOR IDLE-UP). This rigid pipe is located above the power steering pump.

The vacuum line listed as 17345B - HOSE, NO.5(FOR IDLE-UP) attaches to the above and runs to the hose barb pointing back towards the power steering pump on the rigid vacuum pipe (17361G - TUBE, AIR(FOR IDLE-UP). This rigid pipe is located above the power steering pump.



In this picture you can see the red vacuum lines coming off vacuum fitting 17630, and it is easy to see the line running from that fitting to the hose barb pointing towards the power steering pump. The other is blocked a bit by other vacuum lines but you can see the red line attaching to the hose barb pointing towards the engine.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Discussion Starter #20
I had made one of these vacuum line diagrams before based on a hand drawn one I got from a nearby Toyota dealership maintenance department however, it was way off so I deleted it, here is the real thing.

In the below illustration it shows vacuum lines "0" and "2" location on the VSVs, that was key because two of the vacuum ports on the transfer actuator are labeled "0" and "2" the other ports are unlabeled. The unlabeled port next to "2" on the transfer actuator is a smaller diameter than the others and that matches the size coming from the intake manifold. The split line that goes to ports "1" and "3" on the VSVs is left going to the lone port on the secondary vacuum chamber.

I did confirm that this works on my 99 RAV4; I don't know if all the models are exactly alike.



 
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