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Vacuum Questions - Throttle Body and Plenum

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Vacuum Questions - Throttle Body and Plenum

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Old

Jun 12, 2006 | 07:27 PM

#1

Thread Starter

Senior Member

Joined: Sep 2004

Posts: 502

Likes: 1

From: Leesville, LA

Car: 1989 Camaro RS

Engine: Modified 350 TPI

Transmission: Modified 700 R4

Axle/Gears: Posi 3.42

Vacuum Questions - Throttle Body and Plenum

Ok so I'm swapping to TPI (speed density) from TBI and have some questions.....On the Driver's side rear of plenum there is a vacuum port, where does it go?

On the throttle body there a 2 ports on passenger side and one small port on bottom. I have the EGR solenoid on the bottom of the throttle body. I have the Charcoal Canister on the smaller of the two but hwat goes on the top port?

Also, I have oil breathers on both valve covers, do I need a PCV sinse I'm setup for speed density?

Old

Jun 12, 2006 | 07:39 PM

#2

Member

Joined: May 2006

Posts: 181

Likes: 0

From: Yay Area, CA

Car: 1988 GTA

Engine: 350 TPI

Transmission: 700-R4

Axle/Gears: 9-Bolt 3.27

On the Driver's side rear of plenum, that vacuum port is for your brake booster, the top port on your tb is for your pass. side pcv valve.

Old

Jun 12, 2006 | 08:31 PM

#3

Thread Starter

Senior Member

Joined: Sep 2004

Posts: 502

Likes: 1

From: Leesville, LA

Car: 1989 Camaro RS

Engine: Modified 350 TPI

Transmission: Modified 700 R4

Axle/Gears: Posi 3.42

I have the brake booster on the lower intake on the driver's side between the runners. Is this incorrect or what?

Old

Jun 13, 2006 | 02:33 PM

#4

Member

Joined: May 2004

Posts: 197

Likes: 0

From: New York

Car: 1992 Camaro Z28

Engine: 350ci

on a TPI the brake booster attaches to the barbed fitting on the lower left side at the back of the upper plenum.

Old

Jun 13, 2006 | 03:30 PM

#5

Senior Member

iTrader: (2)

Joined: Nov 2001

Posts: 920

Likes: 0

From: AL,USA

Car: 1990 Formula

Engine: 95 LT1

Transmission: T56

Axle/Gears: Weak 7.5 with 4.10s

You have your booster hooked to the PCV port. One of the two on the throttlebody goes to the valve cover, the other one was something for the charcoal canister. I can't remember which one is which. The one on the bottom of the TB goes to EGR solenoid and valve.

Old

Jun 15, 2006 | 12:08 AM

#6

Junior Member

Joined: Sep 2004

Posts: 95

Likes: 0

From: North Carolina

Car: 1982 Firebird

Engine: 355 CID

Transmission: 700r4

link to diagram

Here's a link to the autozone's website with diagrams for the vacuum connections.

</title></head>");
newWindow.document.writeln("<body><div align='center'><img " + getWidth("yes") + "src='/images/cds/" + tpe + "/" + sze + "/" + pc + "." + tpe + "'></img></div>");
newWindow.document.writeln("<div align='center'><table><tr><td><FORM><input type='button' name='sized' value='" + getButtonValue("yes") + "' onClick='javascript:window.close();opener.pop(\"" + pc + "\",\"" + tpe + "_" + sze + "\",\"" + getValueToPass("yes") + "\");'></FORM></td>");
newWindow.document.writeln("<td><form><input type='button' value='Close' onClick='javascript:window.close()'/></form></td></tr></table></div>");
newWindow.document.writeln("<br/>");
newWindow.document.writeln("<div align='center'><font face='Veranda, Arial, Helvetica, sans-serif' size='-2'>Copyright © 2002 Delmar, All Rights Reserved.</font></div></body>");
newWindow.document.writeln("</html>");
newWindow.focus();
newWindow.document.close();

newWindow.print();

}

function pop_norm(pc, tpe, sze)
{

newWindow = open("","","directories=no,menubar=yes,toolbar=no,location=no,scrollbars=yes,resizable=yes,height=400,width=700,left=50,ScreenX=50,top=120,screenY=120");

newWindow.document.writeln("<html><head><title></title></head>");
newWindow.document.writeln("<body><div align='center'><img " + getWidth("no") + "src='/images/cds/" + tpe + "/" + sze + "/" + pc + "." + tpe + "'></img></div>");
newWindow.document.writeln("<div align='center'><table><tr><td><FORM><input type='button' name='sized' value='" + getButtonValue("no") + "' onClick='javascript:window.close();opener.pop(\"" + pc + "\",\"" + tpe + "_" + sze + "\",\"" + getValueToPass("no") + "\");'></FORM></td>");
newWindow.document.writeln("<td><form><input type='button' value='Close' onClick='javascript:window.close()'/></form></td></tr></table></div>");
newWindow.document.writeln("<br/>");
newWindow.document.writeln("<div align='center'><font face='Veranda, Arial, Helvetica, sans-serif' size='-2'>Copyright © 2002 Delmar, All Rights Reserved.</font></div></body>");
newWindow.document.writeln("</html>");
newWindow.focus();
newWindow.document.close();

}

function getValueToPass(valPassed)
{
if(valPassed == "yes")
{
return "no";
}
else
{
return "yes";
}
}

function choose(formAction)
{
with (formAction)
{
ref=options[selectedIndex].value;
document.location=ref;
}
}

function getButtonValue(val)
{
if(val == "yes")
{
return "Enlarge Image";
}
else
{
return "Print Image";
}
}

function getWidth(prnt)
{
if(prnt == "yes")
{
return "width='650' ";
}
else
{
if(prnt == "no")
{
return "";
}
}
}
</script>

<title>AutoZone.com | Repair Info | GM Firebird 1982-1992 Repair Guide | Emission Controls

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