Buying headers..Do I need A.I.R. fittings or not?

[J S Machine]

My '95 Z has one small hose coming from the manifold on the passenger side. It is a preheater hose if I'm not mustaken..It is silver in color and you can bend it to whatever shape you need, attaches to the bottom of the air cleaner housing inlet tube..

I'm not exactly sure what the difference is between trucks that are set up with A.I.R. and the ones that are not.

Can somebody please explain this to me?

[Quyonmob]

AIR is a smog pump. You shouldn't have one.

The hose you are descrbing doesn't even connect to the manifold, go look again, it just connects to the manifold heat shield. It's a joke, you don't need it.

[J S Machine]

AIR is a smog pump. You shouldn't have one.

The hose you are descrbing doesn't even connect to the manifold, go look again, it just connects to the manifold heat shield. It's a joke, you don't need it.

As I was writing that thread, I was trying to remember where it connects on the bottom. I was thinkning maybe it was just on the heat shield and that the actual manifold had no plumbing..Come to think of it, that is kind of pointless isn't it. I haven't looked, but I assume that there is a trap door in the air box which should open and close related to this preheater hose. I assume it is electric..If I disconnect the plug that controls it, will it cause my truck to set a check engine light?

I guess I only need regular headers, not the ones with the A.I.R. fittings.

[Quyonmob]

The intent of that hose, GM calls a "thermostatic air cleaner" is to draw heated hair off the manifold at cold temps as the manifold gets hot withing a minute.

You are right, in the upper end, there is a big flapper door, and it's position is based on heat, cold it's closed, as the hot air heats it, it opens to draw air from the intake tube.

I pulled the flapper out and riveted/epoxied a small piece of sheet metal across the hole it left. My climate is cold as fawk, especially compared to Bama, and I never had an issue with throttle blade icing (-40'F happens here). :D

AIR headers will have a a bunch of extra plumbing on them. If there is nothing connected to the manifold, other than the y-pipe, you need regular headers. (not sure if EGR is plumbed off the exhaust manifold in 95).

[J S Machine]

the only thing associated with my EGR that I know of is the EGR valve itself. It has two ports on the bottom of the intake flange. It is bolted to the intake on top, and on the bottom there is a small double opening right below it, as well as another adjacent port that is rectangukar in shape. the passageways connect inside the intake and both go to the EGR. See here:

http://i226.photobucket.com/albums/dd198/JSMachine/truck/2012-06-10_01-04-20_108.jpg

Those ports for the EGR were completely blocked. I had to dig them out with a screwdriver. Hopefully the check engine light corresponding to EGR will disappear now that I have found the problem of that..


This picture is from my motor swap thread in Tech / maintenance.

[Quyonmob]

I had thought the EGR was all in the intake on these, good to know.