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TPI Vacuum Line Orientation?

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Old Oct 31, 2009 | 12:43 PM
  #1  
IrocTheZ28's Avatar
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From: Shoreline East Haven, Connecticut
Car: '92 Z28
Engine: 350 TPI L98
Transmission: 700R4
Axle/Gears: 10 Bolt / 3.23
TPI Vacuum Line Orientation?

Does it go above the fuel rail or below it? It's a little deceptive to me as I'm finalizing the fuel rail assembly.

One booted end near the center of this pic belongs to a plenum port I believe?

The other end nearest the #1 injector cracked off and I'm wondering where that actually goes...
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Old Oct 31, 2009 | 05:51 PM
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Chevy86 IROC-Z's Avatar
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Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: TPI Vacuum Line Orientation?

Need help? Check out this thread I started a while back. It has everything you need including a Vac. Line Diagram. Peace.

https://www.thirdgen.org/forums/tpi/...rs-i-need.html
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Old Oct 31, 2009 | 06:14 PM
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IrocTheZ28's Avatar
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From: Shoreline East Haven, Connecticut
Car: '92 Z28
Engine: 350 TPI L98
Transmission: 700R4
Axle/Gears: 10 Bolt / 3.23
Re: TPI Vacuum Line Orientation?

Awesome! This may help me out actually. It's dark out and the Trick Or Treaters are preventing me from finishing this vacuum line job...

I will most likely attack this vacuum routing very soon and will give ya a shout & post more pics if I run into problems. I know there are 2 broken lines I must fix in order to save myself a headache after firing this 305 up!

Btw... I figured out the single booted end in my pic belongs to the EGR valve. Thanks to your thread and very much appreciated!
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Old Nov 1, 2009 | 12:37 AM
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Chevy86 IROC-Z's Avatar
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From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: TPI Vacuum Line Orientation?

Glad to help.
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Old Nov 4, 2009 | 08:38 AM
  #5  
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From: Lexington, VA
Car: 1991 Camaro Z28
Engine: Carb 5.3
Transmission: Th350
Axle/Gears: Moser 12 bolt, 4.11 gears
Re: TPI Vacuum Line Orientation?

question for you guys, where the pcv valve hose connects to the intake manifold on drivers side, im not getting any vacuum there, it actually pushes air out from that port. does urs do the same or no? any ideas why mine does this?
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Old Nov 4, 2009 | 05:31 PM
  #6  
Chevy86 IROC-Z's Avatar
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From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: TPI Vacuum Line Orientation?

Good question. Does anybody have an answer? Sorry buddy, I would pull my pcv valve hose off to test mine but my IROC isnt running yet.
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Old May 3, 2010 | 04:58 AM
  #7  
Murphy-Iroc-87's Avatar
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From: Small town of Milton WA
Car: 1987 Chevy Iroc-Z Z28 Camaro
Engine: 357CI L98
Transmission: 700R4
Axle/Gears: 2-77 =[
Re: TPI Vacuum Line Orientation?

Hey i know this post is a lil old but yes. its Positive crank case vent. its supposed to push the air out or it would build up pressure.
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Old Mar 16, 2011 | 03:42 PM
  #8  
1989 iroc-z 5.7's Avatar
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From: blackspurg s.c.
Car: THE 1989 IROC-Z camaro
Engine: L98 5.7 litter v8
Transmission: 700r4
Axle/Gears: Im not sure lol havent had her long
Re: TPI Vacuum Line Orientation?

I was haveing the same trouble with mine but I found this diagram online and here is a link to the page http://theking.joakimweb.se/z28/tech.htm this page has a few things that might point us in the right direction
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Old Mar 25, 2011 | 02:10 AM
  #9  
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Re: TPI Vacuum Line Orientation?

hi guys am kind a new
in this website so I would make this as simple as i can, i need to know where this vacuum lines go to,is for an iroc z 86 305 TPI is the one that is close where de EGR is locate I know one is for the EGR but the other one where it goes?it come from the TPI and the same one comes from the canister but where it goes any help thank you so much


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(i use the picture form someone else I don;t know how to upload the iroc 861pictures)
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Old Dec 16, 2013 | 04:29 PM
  #10  
Curly_e13's Avatar
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Re: TPI Vacuum Line Orientation?

Hi I have a 1989 Iroc z28, had 1 question... Does the vacuum hose from the fuel regulator have a little metal balll inside the hose?
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Old Dec 18, 2013 | 12:59 AM
  #11  
Chevy86 IROC-Z's Avatar
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Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: TPI Vacuum Line Orientation?

Originally Posted by Curly_e13
Hi I have a 1989 Iroc z28, had 1 question... Does the vacuum hose from the fuel regulator have a little metal balll inside the hose?
Nope. There should be nothing in there.
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Old Apr 9, 2021 | 12:59 PM
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Re: TPI Vacuum Line Orientation?

Hi I have a 88 GTA A friend took everything off my motor. So he forgot how to put it back and has now died. I have no clue how to put it back together. I had on mechanic look at it and said there is no direction on where things go and he doesnt want to attempt it. I am screwed. I need some sore of diagrams that will show where thing go and connect to what. Is there anyone that can send me pictures of where wires go vaccume lines and hoses etc. I would be greatfully appreciate this. I would like to get it running. This car has never seen winter of course but it hasnt seen summer for the past 5 years.


Mike Panteluk
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Old Apr 10, 2021 | 09:05 AM
  #13  
KR81's Avatar
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From: Sydney, Australia
Car: 1988 Trans Am
Engine: 305 TPI
Re: TPI Vacuum Line Orientation?

Originally Posted by 88GTAMikePantel
Hi I have a 88 GTA A friend took everything off my motor. So he forgot how to put it back and has now died. I have no clue how to put it back together. I had on mechanic look at it and said there is no direction on where things go and he doesnt want to attempt it. I am screwed. I need some sore of diagrams that will show where thing go and connect to what. Is there anyone that can send me pictures of where wires go vaccume lines and hoses etc. I would be greatfully appreciate this. I would like to get it running. This car has never seen winter of course but it hasnt seen summer for the past 5 years.


Mike Panteluk
Hi Mike, here is a vacuum hose diagram I found here on the forum, should work for you, I have an 88 too and this is basically the same set up, this diagram however, omits the hose going to the cruise control servo. Hope it helps.

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Old Apr 12, 2021 | 06:31 AM
  #14  
88GTAMikePantel's Avatar
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Re: TPI Vacuum Line Orientation?

Originally Posted by IrocTheZ28
Does it go above the fuel rail or below it? It's a little deceptive to me as I'm finalizing the fuel rail assembly.

One booted end near the center of this pic belongs to a plenum port I believe?

The other end nearest the #1 injector cracked off and I'm wondering where that actually goes...
Attachment 423955
Thank you Do you have any other pictures of how this engine wires and sencers hook up.

Please and Thank you

Mike Panteluk
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