Vacuum lines diagram

Hi Dale and thanks for using 2CarPros.

I have attached a picture of the EVAP system vacuum diagram. Also, I don't know if you are looking for a leak, but here is a link that describes how to find a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if this helps.

Joe

I need to know where the vacuum on front passenger side of intake goes. Any complete diagrams of the whole vacuums off the intake would be very helpful. I just changed my motor out and not sure if I have the vacuums hooked up right.

this is the only diagram we have and it covers from a 4.8L to 6.0L all the same. see picture.

From what I gathered it is the crankcase breather tube, but there is nowhere to hook it up to. I went from a LM7 (non flex fuel) to a L59 (flex fuel). The guy that sold me the motor said that all I have to do is change my intake. Is that true? Because it is looking to be more than just that to me. Any information on the swap?

if it is flex fuel the injectors are different and fuel lines. intake should be same but to be sure check against old one. it may connect to throttle body or ductwork leading from air cleaner to throttle body. normally that is where breather goes.

I just want to update, my motor is changed out and running great. Just to verify you can change from non flex to a flex motor, you just have to change out your intake manifold and fuel rail. All in all the swap wasn't bad considering it was done in my back yard. Thanks for all the help.

If you have any more issues or any other question, do not hesitate to get back to us!

Would it be some thing else?? Drove great yesterday(first run on new motor, today from 1st thing this morning I had to pat gas a few times to clear out and idle, like old school carbs. Way home from work started great then idle up a little then lower likes it breathing. Checked all visible signs hoses ect. nothing.Gonna try carb cleaner trick tomorrow see if idles up. When I put back together originally I picked the best of the two and and used it just had to hear my 'used' motor for the first time. Question on gaskets would it being broke on 1/4 from bolt hole to bolt hole. Never interfers with intake gasket cause it to leak? RTV just them 2 or the hole gasket? I used the one that was all 1 piece but flatten compared to the other with a broken side. Wrong move I realize now.

if intake gasket is broken replace it rtv will get into exhaust and screw up O2 sensors. carb cleaner may take of other problem bu clean throttle plate on both sides and iac hole

Ok after doing a little researching, the motor is "Z" but the intake is "T". The gaskets look very similar but the price is like $12 difference so there's gotta be some differents. So which gasket should I use???

what is the difference of the old gasket vs new one ? larger ports, e85 fuel uses larger injectors for the alcohol. have you cleaned throttle plate on both sides and iac hole and are there any holes between maf and engine if there are fix them so there are none same with bad grommets on engine, no air leaks

Do I get the gasket that fits the intake itself or the gasket that fits the block? I mean I understand larger ports so which side do I want to block more of? so to speak. I've cleaned the plates and iac hole when I had intake off changing motor out.

its a plastic elbow about a pencil eraser around and its on the transfer case

Check to see if it goes to the front axle.

uput the gaskets that will fit the head if worst comes to worse then try the intake from the other engine with the injectors for what the old engine was.I don't think anyone has ever done this kind of a swap before and it may not run right ever because of it.one other thing you may have to drive this for a bit so that computer can relearn what is dealing with so it can make corrections as you drive.

thank you

Ok just to update she's purring like a kitten now. I tried your suggestion with the fuel rail switched to the motors original intake. Started up for bout 20 sec then wouldn't hit a lick. I checked everything, so I thought, then decided to put my old intake back on. Wouldn't hit a lick. I bled the fuel rail again but no gas started to come out. Now my fuel gauge has never worked I judge by the tripometer which only had bout 250 on it so I didn't ever think about gas at all. Poured about a gallon in tank and she fired right up. Stupid mistake I know. A little fine tuning and she's running top notch. My original motor had 280000 miles on it, got it with 45 new. This one starting at 140000 from junk yard. Maybe it'll last til I get it rebuilt. Gonna try to rebuild it myself. We'll never know if that odd ball swaps with the intake would work or not now. Anyway thanks for all your help

One other thought, on some of them, there was a vacuum supply that ran a switch for the 4wd light. I don't think your year had that, but it may.

Glad you could get it fixed please use 2CarPros.com anytime we are here to help

Best, Ken

Engine Performance problem
1989 Chevy Silverado V8 Two Wheel Drive Automatic

I need to find the correct assemble for the vacuum lines that conect to the fuel injected carborator. I have them hooked up but the engine is idleing to fast and when I put it into gear it stalls out.

this is for 5.0 calif automatic

i have been told i need to replace a 02 sensor. are there more than one, and can you give me an idea what i should pay for this to be replaced.

Need the engine size here is one for Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.5.0

Engine Performance problem
1986 Chevy Silverado V8 Four Wheel Drive Automatic

i have a 1986 suburban silverado there is no vacume digram under the hood. i want to hook the way it is supposed to go(cali or fed). 350 moter some vacum is connedted not all of it. from what i have found there is no ecm no cat(never was), 4 barrel carb egr ok engin is jasper air cleaner only has 1 hose connection for hot air moter. all vacum digrams welcome also proper air pump digram needed. thanks in advance joe

what size engine? 5.0L, 5.7L etc.. gasoline or diesel?

Don't know if the above will work for you or not? Welcome to the forum.

just a fue ? what is efe valve (heat riser), dtstr tvs (?) and is hose that connects to air cleaner (between vapor can and decel vav) just a bleed for vapor canianster, other than that i think i can make work. there is some weard valve that connects to vapor canister wonder what it is, has 4 ports 2 for vapor 2 for vac ill see if i can pix to post. also carb has bowl vent where does it connect. (pluged now) once again thanks joe

I believe tvs is thermal vacuum switch and efe is early fuel evaporation.

[quote:0d6236e707="bluelightnin6"]what size engine? 5.0L, 5.7L etc.. gasoline or diesel?[/quote:0d6236e707]
5.7 gas

do you no what the rpo code for that digram

Hi, the autozone site has free diagrams. you have to register your vehicle, it's free. Then click on repair info. I believe the vav diagrams is under the emissions link. Wiring diagrams under chassis link.

I need to put vacuum hoses on

Vac Hoses

but all the emssions have been removed all i have is the carb the vacuum supply and transmission mod.and power brakes

Since you only require the trans vacuum, forget about all others and get the vacuum direct from the source, which is the carburettor. One vacuum line would do.