Vacuum Schematic....for TBI (1 Viewer)

[FJBen]

I'm doing a TBI swap this weekend and wondering about the vacuum schematic. Anyone have any idea where I can look for one? I'm putting on TBI from a 90 Caprice cop car.

I know a few of the spots to connect to: The MAP sensor hooks up to the one on the back, PCV goes on the big one.

I need brake booster, Vacuum 4wd and EGR.

I see left/right manifold vacuum, and ported vacuum...what do I hook up and where?

 

[Isotel]

My Brake Booster comes off of the Manifold, are you using a TBI mainifold or an adaptor plate?

Map sensor off the rear one,

the rest of mine are Plugged up, "ported Vacuum" used to go to EGR, but i dont have that hooked up anymore!

 

[FJBen]

My Brake Booster comes off of the Manifold, are you using a TBI mainifold or an adaptor plate?

Map sensor off the rear one,

the rest of mine are Plugged up, "ported Vacuum" used to go to EGR, but i dont have that hooked up anymore!

Great info thanks! I'm using the TBI manifold. I'm using the EGR, so thats good to know thats where it goes. So I can use the right or left to power my 4WD I assume. Power brakes, I suppose I can use one of the "plugged" ports up top for my brakes.

 

[theo]

I'll look at mine tonight and get back to you tonight or tomorrow.

 

[FJBen]

I'll look at mine tonight and get back to you tonight or tomorrow.

cool thanks!

 

[theo]

I took a pic of mine then forgot to bring the camera to work, so a description is all you get. Should work though.

For my '93, looking at the front in your picture:

"Left Manifold Vacuum" goes to a T. One branch runs to the EGR control valve, the other branch runs to the air control valve for the smog pump.

"PCV hose connection" - yup

"Right Manifold Vacuum" used to run into the cab to a vacuum gauge, but I plugged it when I was searching for vacuum leaks.

"Ported Vacuum" runs to the fuel evaporation canister.

For brake booster, I have a forward facing port on the intake manifold, just below the throttle body on the right side when looking into the engine bay. Any large diameter vacuum port should work.

HTH.

 

[FJBen]

I took a pic of mine then forgot to bring the camera to work, so a description is all you get. Should work though.

For my '93, looking at the front in your picture:

"Left Manifold Vacuum" goes to a T. One branch runs to the EGR control valve, the other branch runs to the air control valve for the smog pump.

"PCV hose connection" - yup

"Right Manifold Vacuum" used to run into the cab to a vacuum gauge, but I plugged it when I was searching for vacuum leaks.

"Ported Vacuum" runs to the fuel evaporation canister.

For brake booster, I have a forward facing port on the intake manifold, just below the throttle body on the right side when looking into the engine bay. Any large diameter vacuum port should work.

HTH.

Awesome...thanks! I'm not running the smog, so thats one less. Maybe I should get a vacuum gauge...then at least I'll have something exciting to look at rather than the RPM gauge.

thanks!

 

[Trollhole]

This needs to go in the FAQ