93&Me

I've toughly checked Haynes and the Online FSM and I must just be missing what I am looking for. First is a small vacuum hose that was ripped, I replaced it with OEM hose, but don't really know that its for. It is the hose in the picture under my finger that is off of a "T" split, it only travels about 7 inches. the original hose is attached to this orangish brownish valve. Next is the blue banded vacuum hose, I think it goes to a valve just behind the lower cross frame. Last is this canister that is in the passenger side wheel well. Everything is running fine, I have the ole deceleration, low idle symptom, but its very very slight with only occasional fluctuations below 500 rpm. Its never stalled or really sputtered. I feel like the emission control system is part of this problem so I am starting by making sure all of the vacuum hoses are in working order. Oh and a bonus is this ground screw and wiring that is disconnected from something, this truck used to have a CB but I don't know if thats related.
Here are the pictures on my drive: https://drive.google.com/drive/folde...Ie?usp=sharing

Jimkola

There's a certain amount of guesswork involved when trying to help someone online. Help out by listing specific info on your vehicle.

2ToyGuy

I'm not sure about most of that stuff, but I think that last picture is the vacuum canister for the ADD system. I might well be wrong on that, though.
Does your truck still have it's vacuum diagram sticker on the underside of the hood? When it's open (the hood), it should be the forward, left corner of the hood. Some still have them. It can be a huge benefit for situations like this. If not, have you Googled, or whatever search engine you use, "93 Toyota 4Runner vacuum diagram". No quotes, obviously.

Good luck!
Pat☺

93&Me

learning already! It is a 1993 Pickup SR5 4x4 extended cab, 3vze. Everything as far as I know is stock or has been replaced by OEM or close to it, only mods I can tell is the camper and the now removed CB radio.

atcfixer

iTrader: (1)

1993 3vz shows brown 2 pin connector as being the vacuum switching valve for FPU. Wire colors should be white/red and solid green. FPU = Fuel Pressure Up

That ground terminal isn't a factory connector, so I wouldn't worry about it.

It might be kind of a big job, but you could replace all of the vacuum lines one at a time. You don't need factory OEM vacuum hose unless it's a preformed shape, any parts store should sell it by the foot. That would atleast remove a vacuum from being a possible cause. The damaged one clearly needs replaced.

93&Me

good question Ill check it out. Yes ADD system! Ill be looking into this thanks.

2ToyGuy

About the only "preformed" vacuum lines, I think (seldom, but I do once in a great while), are for the PCV system. I may well be wrong on that though.

Good luck!
Pat☺

scope103

The OEM hoses are marked; #* is straight engine vacuum, so you have a lot of those. #2, #3, #4 are different functions, and the markings really help me with tracing. For that reason I'd keep the OEM hoses if in okay condition. If you replace a "numbered" hose, it would be a good idea to use a paint-marker to put the number back onto it.

Replacing any parts at random is a hard way to fix a problem. If you suspect a vacuum leak, use an unlit propane torch, or spray brake cleaner, and listen for an idle change. You should be able to find the actual source.

93&Me

great info! is there a section in the FSM where it says what the numbers correspond to?