Vacuum Line replacement with high temp silicone lines - Toyota RAV4 Forums
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post #1 of 37 (permalink) Old 04-16-2017, 12:49 PM Thread Starter
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Vacuum Line replacement with high temp silicone lines

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=0B0...GxCR2RaS2ZCdms
A view of the evap cannister - https://drive.google.com/open?id=0B0...lhvaWJCQTg0QUU
A view of the engine compartment - https://drive.google.com/open?id=0B0...k5qTmtQbjdBYTQ

It may be that my sole purpose in life is simply to serve as a warning to others.

RAV4.1, 1999 RAV4, 3S-FE engine, E250F transaxle 5sp AWD, 5 door, LHD, Redneck Edition (RNE), Mossy Oak Obsession wrap, heavily modded, TOAD
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post #2 of 37 (permalink) Old 04-16-2017, 02:46 PM
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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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post #3 of 37 (permalink) Old 04-16-2017, 03:38 PM Thread Starter
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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.

It may be that my sole purpose in life is simply to serve as a warning to others.

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post #4 of 37 (permalink) Old 04-16-2017, 04:47 PM Thread Starter
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This youtube video shows a transfer system vacuum diagram -

It may be that my sole purpose in life is simply to serve as a warning to others.

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post #5 of 37 (permalink) Old 04-16-2017, 09:24 PM
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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.

2000 RAV4 - 4th Gen 3SGTE
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post #6 of 37 (permalink) Old 05-04-2017, 01:35 PM
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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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post #7 of 37 (permalink) Old 05-04-2017, 02:19 PM Thread Starter
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Quote:
Originally Posted by prospector View Post
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.

It may be that my sole purpose in life is simply to serve as a warning to others.

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post #8 of 37 (permalink) Old 06-27-2017, 12:11 AM Thread Starter
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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.

It may be that my sole purpose in life is simply to serve as a warning to others.

RAV4.1, 1999 RAV4, 3S-FE engine, E250F transaxle 5sp AWD, 5 door, LHD, Redneck Edition (RNE), Mossy Oak Obsession wrap, heavily modded, TOAD
'96 Newmar Mountain Aire, 40' diesel pusher motorhome, the mothership
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post #9 of 37 (permalink) Old 06-28-2017, 02:25 PM
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Does this give anything regarding performance to the engine. Or other then that, it just a nice look.
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post #10 of 37 (permalink) Old 06-28-2017, 02:51 PM Thread Starter
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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.

It may be that my sole purpose in life is simply to serve as a warning to others.

RAV4.1, 1999 RAV4, 3S-FE engine, E250F transaxle 5sp AWD, 5 door, LHD, Redneck Edition (RNE), Mossy Oak Obsession wrap, heavily modded, TOAD
'96 Newmar Mountain Aire, 40' diesel pusher motorhome, the mothership
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