AIR system (91-93 5spd cars)

[series8217]

I'm using a 3.4 TDC from a 93 Chevy Lumina with the automatic transmission, but I need to get it smogged in California with a 5spd... so I need to have a complete working A.I.R. system.
As far as I can tell, there are only tubes on the rear exhaust manifold, as there is only one part number for the front manifold but two for the rear (one for 5speed one for auto). Is that true? It looks like I can just drill out my rear manifold and tap the holes for the AIR injection pipe.
As far as getting part #s, I see that rockauto.com lists a lot of stuff for the air system. I'll probably use a pump from a more common setup such as that on the F-body cars and Corvette, since they are easier to find in the junkyards so I don' thave to spent $100+ on a new one.
Does anyone have pictures of the complete setup? I don't know where the pump is normally located, how the pipes are arranged, where check valve(s) are, etc..

-Steven

[grandprixgtp_91]

RE: AIR system (91-93 5spd cars)

there are pipes on both front and rear manifold and the pump is under the front fender on the passenger side, the check valves are on the manifold pipes. but from what i understand putting in the air pump dosent affect the emmisions much, because only 5 speeds have it not autos. and each pipe has a piece of heater hose running to the pump, pretty simple but i tihnk it is kind of useless.

Jake

[series8217]

Re: RE: AIR system (91-93 5spd cars)

there are pipes on both front and rear manifold and the pump is under the front fender on the passenger side, the check valves are on the manifold pipes. but from what i understand putting in the air pump dosent affect the emmisions much, because only 5 speeds have it not autos. and each pipe has a piece of heater hose running to the pump, pretty simple but i tihnk it is kind of useless.

Jake

Thanks. I wasn't aware that they were on the front and rear manifolds. Are the part #s for the front and rear manifold pipes the same? I only see one listed on rockauto.com..
The reduced emissions isn't the point of installing it. California smog involves a complete visual inspection to make sure that ALL original components are present and in working order.

-Steven

[series8217]

Here's pics of what I see on rockauto.com.
The GMPartsDirect catalog doesn't list any of the pipes


This is listed as the left side (front) pipes. Looks like the right side probably would use the same ones. Is that right?


Not sure where this goes.. does this one couple the front and rear manifold injection pipes, with that rubber hose going to the AIR pump?

If thats the case, I guess the check valves must go between that T section and the injection pipes for each manifold.

Also, how does the AIR pump draw fresh air in? Is there a breather tube attached to the air filter box?

[Anonymous]

[series8217]

Thanks a lot 91gtp! Thats a great pic. Now I just have to find a part # for the rear manifold pipes, and figure out what that other pipe thats listed on rockauto is for.

-Steven

[Anonymous]

A few more of the hoses and the unit itself

[dohcfiend]

holy crap. that looks like a PITA. get a chip and bypass that crap.

[grandprixgtp_91]

ok if your car is an original automatic then the sticker wont show the air pump, so if you did the 5 speed swap you dont need the air pump. but if your sticker is the 5 speed one then see if you can cover it up with an automatic, it will be much easier.that long tube you showed in the bottom pick runs along the frame and goes to the rear manifold.

Jake

[series8217]

ok if your car is an original automatic then the sticker wont show the air pump, so if you did the 5 speed swap you dont need the air pump. but if your sticker is the 5 speed one then see if you can cover it up with an automatic, it will be much easier.that long tube you showed in the bottom pick runs along the frame and goes to the rear manifold.

Jake

California smog involves a complete visual inspection to make sure that ALL original components are present and in working order. They don't look at any sticker. They look at Mitchell's. There's no hiding anything, especially at the CARB test center I have to go to for the recert. Its a state-run facility, not a corner gas station/smog check place.

Kinda hard to tell whats going on in those pics.. I can't see the long tube I'm wondering about. Where does the hose coming off the long tube go? I found a pic of the AIR pump and it looks like it has two ports; one for front and one for rear manifold? Or is one of those an air inlet? if someone could draw up a diagram and post it that'd be awesome

[BlueShift]

I was trying to look into the 96+ AIR system, but it appears that the pipe only goes into one place in the "collector" tube, as opposed to each primary on the 91-93 systems. Don't know if the pump is the same or not. At least it's electric and not belt driven!

Believe me, both of us would have the AIR system deleted - cept the BAR certification that we're both going to undergo is a 2 hour long thourogh check to make sure every single factory installed emissions system is installed and functional. Pretty detailed stuff. Did I mention that we're doing TDC swaps into a Fiero?

I wonder if it's possible to retrofit two of the same side pipe, and run rubber air hose to them from the pump, as it has two outlets. I need to get ahold of an actual AIR pipe and do some mockups to find out.

[series8217]

Still trying to figure out how this all hooks up... anyone have pics of the hoses and pipes actually installed and hooked up on the engine?

[pepsi_coke]

hey Series, if you can wait til tomorrow, Ill take as many pics of it as you want. What exactly you looking for?

BTW, do you know where I can get me an A.I.R. pump, mine is pretty much toasted .. does RockAuto got one of em?

[series8217]

I think rockauto has them but they are reaaalllyy expensive. Try a search on car-part.com first.
If you could get pics of each of the pipes (from above or below) for the manifolds, as well as the long pipe that goes between the two (?) and the location of the pump itself that'd be great. I don't know how much of it is visible from above. If its possible to get a top engine bay shot that shows some components that'd be great too.
Thanks.

[OldSkoolGP]

Otherwise, the 94-95 3.4 DOHC with SFI did use the air pump on the automatics and the manifolds match your heads. That's another option you have.