rattlecanpaint

So my son and I are rebuilding the engine in his truck. 86 sr5 22re. It's been apart for 8 months waiting on the machine shop. (He's good but Lord is he slow) I've got it all back together but one coolant hose. It's a small hose that comes up vertical right next to the neck for the upper radiator hose. I can't find where it goes. (Most likely under the newly installed intake due to Murphy's law) I vaguely remember the hose being so dry rotted that it fell apart on removal so I don't have the old hose to use as a map. Could someone go take a look and maybe a pic? Thanks.

2ToyGuy

That little, "J" shaped hose, called the jumper hose, goes from the tube that runs up from where the lower radiator hose connects to where you attached the jumper hose. The other end of the jumper hose goes to the water pump's intake, right under the power steering pump. The long end goes onto the "baypass pipe", I think it's called, that comes up from the lower radiator hose. The short end goes onto the water pump intake. You may need to trim the jumper hose's length to fit. I always have. Needed to trim the hose, I mean.
Make sure you place the hose clamp on the water pump end in such a position you can get to it around/under the power steering pump. It can be a royal PITA otherwise, trust me.
Another thing that may help: I always wet the inside of the hose before I slip it onto whatever fitting it's going onto. Just some water, spit, baby oil, whatever. Helps it slide on easier, and seal up better. Make sure the fitting you're attaching to is clean, too. They can develop corrosion on them, so be careful.

Does this help at all?
Pat☺

Co_94_PU

iTrader: (-1)

By-pass hoses

On the intake side of the engine on the backside of the water pump. You have one pipe facing rear this connects to the L angled water nipple on the underside of the intake manifold. You have another facing outwards from the engine this connects to the air valve. The other water line from this valve connects to the throttle body. There is a corresponding water passage out the side of the throttle body, THIS is the one you're asking about I believe, it snakes down and around the radiator hose and connects back to the top of the intake manifold.

Be very careful not to mix up coolant and air lines on the throttle body..


There is a photo somewhere in my album of these hoses without the upper plenum in place, but it's kind of washed out.

wallytoo

iTrader: (1)

this may or may not help you:

Co_94_PU

iTrader: (-1)

Good pictures sir!

You can clearly see almost everything I tried to describe in that last image. Just missing the lower "L" Union the fat hose (from the back of the bypass pipe, fat U shaped watee hose in previous images) goes into because it's hidden behind the iacv

wallytoo

iTrader: (1)

it can barely be seen in the fourth picture.

rattlecanpaint

THIS is the one! Thank you! It basically goes out the lower side of the throttle body, under the upper radiator neck then turns up and over the radiator neck and down beside it. I guess I'll have to that the plenum back off to get this thing installed.

Co_94_PU

iTrader: (-1)

Easier to move the thermostat housing out of the way, I think.

rattlecanpaint

In the last picture here, What sensor is sticking out of the upper radiator hose neck? Obviously coolant, temp, but is it for the gauge or ? It seems like the 2 directly under that (connectors are visible on the right side of this pic) are for the ECM. This thing i got is so hacked up and rigged together, not even the wiring diagram is a help. (It looks like the wire broke and someone just stuffed a chunk of wire in the connector and globbed some solder in there to keep it.) Found out today it has the timing cover off an '84 engine and the water pump is different. Also any idea what "CMH" is? I'm guessing its a heater of some sort based on the wiring diagram. (Looks like a resistor in the diagram and I'm guessing the "H" stands for heater.) unless this thing I'm thinking is a sensor is actually the "CMH" Maybe a pre heater for the thermostat or something?

2ToyGuy

It's for the Emissions Control System, and CMH stands for Cold Mixture Heater.
The computer activates the Cold Mixture Heater Relay, which in turn activates the CMH.

Just exactly what it does, I'm not sure, but I think it might be the heater in the Aux Air Valve, that allows more air during a cold start to work with the cold start injector to provide idle up.

I am often wrong, though. It might be something totally different.
Pat☺

old87yota

CMH does stand for Cold Mixture Heater.

The Cold Mixture Heater is used on 22R (not on 22R-E) engines and is located on the underside of the intake manifold. Its purpose is to heat up the air / fuel mixture in the intake manifold while the engine is cold (below 43°C, or 109°F) which accelerates the vaporization of fuel for better cold weather driveabilty, and thus lower emissions.

Co_94_PU

iTrader: (-1)

​​​​​​Ac cut off on the left, fuel pressure up TSW on right (TSW at ecu)

.. You can tell them apart by the connectors style. TSW has a round plastic body.

rattlecanpaint

That's what I'm talking about! Interesting though, Mine only has the one with the big plastic connector (Which is the one with the wrong color wire stuffed into it and some solder globbed in it. What does TSW stand for?

2ToyGuy

Temperature SWitch.
If I'm not mistaken, it feeds the computer to turn on the High Temp light on the dash.

Again, I may well be wrong...
Pat☺

rattlecanpaint

OK, so it's the one marked "temp switch 50 degrees Celcius." Thank You! Now I can go find what wire it needs to be connected to.

Co_94_PU

iTrader: (-1)

Pin #16 on the 18 pin connector of the ECU.

The wire routes up out of the main harness with the coldstart injector wires... Somewhere don in the middle of the intake.

The temperature switch ia part of the systrm.that activates the fuel pressure up vsv.
​​​​​​

wallytoo

iTrader: (1)

alas, you are [mistaken]. has nothing to do with a dash light.

2ToyGuy

Well, at least I'm consistent.
I'm going to quit while I'm behind, and just keep my fingers off the keyboard.
Shows how much I've learned, having owned two of them for 30 years now. I even replaced the 4Runner's heads. Twice! First one wasn't my fault, though. It was cracked when a friend overheated it. Several times. Drove it 5 miles or so in the desert heat in Yuma, after throwing the alt/water pump belt. I even had tools and replacement belts IN the truck. Some friend, huh?
The second head was cracked from the manufacturer. The third time's been a winner so far. About 45,000 miles so far.

Shutting up and lurking now...
Pat☺