non-GSi TB/AIR system vacuum routing question

[LastSaturn]

Definitely a n00b question, right? I did the requisite searching but couldn't find the answer for my case.

I'm ready to install my non-GSi TB. There are four vacuum ports on the bottom, two large and two small.

I plan to cap the two large ports and connect one of the smaller ports to the canister purge solenoid.

My question is in regards to my AIR system. May I safely connect that to the other small port on the non-GSi TB or would I throw codes or create rough running conditions?

I ask because in my searching I've read that where you pull vacuum from (before or after the butterfly) affects engine performance.

[satysw2]

The two larger ports are for coolant. Dont worry about plugging them.

The air question is for someone else as ive never touched a 3rd gen.

[LastSaturn]

The two larger ports are for coolant. Dont worry about plugging them.

Now I really feel stupid. That explains all the rust I found in the ports. Thanks for cluing me in.

[S.Bretz]

The air system should not be affected by a t-body. The vac source for the air system is that vac line that runs over the top of the valve cover and connects to the #1 intake runner and the AIR control solenoid.

[anti-rice 01sl2]

The AIR system references vacuum from the manifold. So any place after the throttle plate (manifold) should be just fine. I take it this is a late 99 motor? All the other AIR systems I've seen were using the composite manifold and referenced vacuum from I believe the number 1 or 2 runner.

[LastSaturn]

OK, so I'm still rocking the SOHC as in my sig. So, I've got the previous gen IM and my AIR is pulling vacuum from one of the ports on the top of the TB. I think I'll just T the line between the valve cover and IM.

[anti-rice 01sl2]

OK, so I'm still rocking the SOHC as in my sig. So, I've got the previous gen IM and my AIR is pulling vacuum from one of the ports on the top of the TB. I think I'll just T the line between the valve cover and IM.

Tapatalk doesn't use sigs. And your sig may have changed 2 years from now when someone else is looking back to find help on this subject. I suggest specifying for that reason.

And Ting off that line is asking for all kinds of nasty sludge to enter your vacuum system

[LastSaturn]

Tapatalk doesn't use sigs. And your sig may have changed 2 years from now when someone else is looking back to find help on this subject. I suggest specifying for that reason.

And Ting off that line is asking for all kinds of nasty sludge to enter your vacuum system

2002 SC1.

Any better recommendation than that line? Judging from your earlier post I don't want to pull from one of the GEO TB vacuum ports since they're outside the throttle plate.

I've seen one guy's manifold that was drilled and tapped to add vacuum fittings but I don't know if I want to go that far.

[S.Bretz]

I guess t the pcv or the brake booster hose

[LastSaturn]

I guess t the pcv or the brake booster hose

For the PCV, isn't that the line Nate told me to avoid or I'd end up with "all kinds of nasty sludge" entering my vacuum system? I'm asking because I'd rather T that line as it's closer to the AIR solenoid than the brake booster line.

I know I can T the brake booster line but I thought it would be silly to have vacuum hose running from one corner of the engine bay to the other.

One last thing: Has anyone noticed that the Haynes repair manual shows a Geo TB in chapter 4, fuel and exhaust systems?

[centralfloridasc1]

lol
which picture?

[LastSaturn]

lol
which picture?

Picture 13.2, on page 4-9.

[centralfloridasc1]

haa

[S.Bretz]

AS long as you have vac to operate your features, it should work. It might get some sludge in it, but I think you will have the life out of it before then....even if the line does get sludge and I'm wrong, go get another 2-3ft of hose to replace the vac line. It shouldn't cost more then $5, so big deal.

[LastSaturn]

AS long as you have vac to operate your features, it should work. It might get some sludge in it, but I think you will have the life out of it before then....even if the line does get sludge and I'm wrong, go get another 2-3ft of hose to replace the vac line. It shouldn't cost more then $5, so big deal.

I appreciate you and Nate answering my questions. I got the TB in yesterday. I connected the AIR and the canister purge solenoid to the two ports on the TB.

I got a P0113 but that may have been related to the piston soak I did at the same time. I cleared the code this morning and I'll watch it to see if it pops again.