xplane

I am currently remaking the Vacuum Diagrams for our cars as a for fun project. It started with me remaking the diagram for my car so i could identify what went where easier and now I'm gonna try to redo all of them.

first the 4 bangers and a V6

82-84 2.5L TBI
85-86 2.5L TBI
86-89 2.8L MPFI

xplane

V6's
82 2.8L carbed
83 2.8L carbed
84 2.8L carbed

xplane

V8's
85-86 5.0L TPI
87-89 5.0L-5.7L TPI

TPI84GMC

Beautiful!! I just joined the forum looking for TPI vacuum diagrams! cant wait!

xplane

What year/motor?

pr1689

If you have one for a 86/87 TPI that would be great. It's an 86 car but with an 87 engine, 5.7L V8 TPI

Thanks,

Pat

Bobby_80s

iTrader: (2)

would be nice if someone made hose/vacuum diagram for my 1986 tpi cruise control. got hoses all over tryign to put it back together from previus owner mess up.

xplane

Ill see if i cant dig something up.

Bobby_80s

iTrader: (2)

great thanks

xplane

i updated the diagram for that motor.

johnblaze322

if you can for an 84 carb 305 thanks

TPI84GMC

I'm working on what I believe is an '88 5.7 TPI setup. I only see 2 vacuum ports on the throttle body. the small one on the bottom and one large on e on the side that goes to the passenger side valve cover. any one have a pic of where the other line connects that is shown?

xplane

if your talking about the HVAC And CC hoses they may have a T and share the same source like my car does.

If people that have these motors that are hooked up correctly will let me know i will add that info. Kinda hard to be shure when i dont have one of each of these motors myself LOL.

I H8 WWD

iTrader: (5)

I have an 89 Camaro LO3 305 TBI with Cruise. Most appreciate it. I am taking out my smog pump, diverter valve. Thanks much.

sofakingdom

iTrader: (1)

Here's one for some year of L69; I forget which one. Not that it matters since they're all the same AFAIK. And, the LG4s are all just like this too, except for teh air cleaner details.

Ozz1967

iTrader: (4)

They aren't all quite the same. This one doens't have the lines that go to the throttle servo and down to the ball looking thing that's stashed on the bottom of my driver-side fender. At least not that I can tell.

sofakingdom

iTrader: (1)

No; those are accessories, parts of whole other systems (A/C & cruise), not part of the engine. That's a copy of the emissions label, which is independent of what options the car was equipped with.

They get fed from a fitting on the top of the intake behind the carb.

Ozz1967

iTrader: (4)

Ahh...now I see the difference. I was trying to makes sense of it and I'm like "That doesn't have this...or that, etc..." I wish they had one that outlined all the accessories. That would help me find the vacuum leaks that pop up much easier.

Bullydawg

iTrader: (7)

Anyone know the size of the vacuum line size is for an 88 5.7 TPI?

Ozz1967

iTrader: (4)

What do you need for an 84 Carb? I've got a 84 T/A that's carbed. Let me know what your looking for and I'll try and help. Sorry, I don't have an accurate diagram for the accessories, just going off memory. The Camaro and T/A set up should be almost identical.
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That's going to depend on the line you need. There should be about 4 different sizes depending on the accessory or engine part that it's going to.

Toehead

Another one that is quite hard to find is the diagram for 85 MPFI. It is a one off year.

Dale

iTrader: (12)

Bringing this back to the top. Is the 90-92 TPI the same diagram as 87-89TPI?

bbsr72

where does the vacuum line that is located behind my tbi,but in front of my distributor run to?it comes right out of the intake.

sofakingdom

iTrader: (1)

To various accessories that aren't part of the engine.... cruise control, and the HVAC control system.

I H8 WWD

iTrader: (5)

89 LO3 TBI with cruise

No AC, Smog.

sofakingdom

iTrader: (1)

Same as any other L03....

The cruise and AC are part of the car, not the engine. Kind of like, your house builder might have given you a wiring diagram of your house; you won't however, find the schematic of the toaster in your kitchen, on the schematic the builder gave you. The toaster is a separate system from the house, even though it gets its power from the house wiring. Engine vacuum diagrams are usually like that: they tell you about the ENGINE, but then, you need a SEPARATE diagram for any accessory sub-systems that happen to hook up to the engine and use vacuum as one of their power sources.

I H8 WWD

iTrader: (5)

-BLANK-

sofakingdom

iTrader: (1)

Post one. Contribute, instead of complaining in all-caps that no one else has done what you want for you.

Dale

iTrader: (12)

I searched and searched, and found the one I needed on a 4yo post.

I H8 WWD

iTrader: (5)

-BLANK-

xplane

wow i forgot all about this little project. thing was at the time i was doing it no one seemed to care. LOL. but ill make some more if yall want. and please even if you dont need the diagram but have the corresponding motor look them over and see if i have any mistakes. man this is thread is OLD.

Oh and i want to add the various accessories to the diagrams.

dafrogtoad

Can you please post a daigram for a 1994 LB4? It's in an astro..
Thanks

jminton

got one for a 305 4bbl w/ cruise? thanks!

ThirdGenTN

iTrader: (2)

I am new to the thirdgen site but am definitely lovin' it! I have been searching for a vacuum diagram. Thanks for the work on a VERY NICE diagram for my 89 TPI!

SDTransAM

iTrader: (5)

Hi, this is great.

I am currently putting my 91 L98 t/a back together, and cant figure out what connecter? plugs into the back of the egr solenoid. it looks like a vacuum line would connect to it.

swisher

Wow! That's just what I was looking for. My husband is swapping motors in our '89 iroc, and my job was to find the vacuum diagram. Thanks!!!

Vader

It would be nice if the diagrams included the alpha codes, like this 1984 carbed 305:



So that owners could positively identify their diagrams.

This is another diagram for a 1984 carbed 305, but there are significant differences:

gearhead0384

iTrader: (7)

Just what I was looking for, great job BTW.

86NiteRider

iTrader: (10)

Actually Vader according to this website that JamesC just turned me onto which has all of the vacuum line diagrams your top picture is a 1985 carbed non Canada 305
http://www.autozone.com/az/cds/en_us...rInfoPages.htm

Bruceak04

Hi,
Do you have 305 TBI 1989 Camaro RS
​vacuum diagram reproduction like for the other engines?
Thanks

3rdgenzroc

Just do a quick google search for exactly what you wanting (89 RS Camaro V8 TBI). they will come right up.

Tuned Performance

iTrader: (92)

https://www.thirdgen.org/forums/tech...iagrams-i.html

Don Christensen

Still relevent in 2023 - MANY THANKS!!