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03-12-2004, 02:18 PM
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#1 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | This is what your AIR injection system looks like
I was out in the garage and was playing with some of my old parts and I decided to reconstruct the AIR system found on our cars. This is off a 1990 305 TBI but I am pretty sure that it is the same for TPI cars as well. I should have a few btter pics later on because this camera I have is pure garbage. |  
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03-12-2004, 02:19 PM
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#2 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Here is another view with the same labeling. | |
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03-12-2004, 02:20 PM
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#3 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | I figured these pics would help people with the distinction between their EGR, AC and AIR stuff. | |
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03-12-2004, 02:46 PM
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#4 | | Senior Member
Join Date: Jan 2001 Location: New Berlin, WI
Posts: 261
Car: 1988 Trans Am Engine: 305 TBI Transmission: 5 spd | What is the purpose of the "Diverter Valve"??? I have been reading about if it(A.I.R.) is nessesary to have to pass emissions. I know it is needed to pass visual( i dont have a visual) but is it needed for the siffer??????
btw..thanks for the pics  (i know its gonna help me sometime) | |
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03-12-2004, 02:54 PM
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#5 | | Senior Member
Join Date: Jun 2001 Location: Charleston, SC
Posts: 9,548
Car: 91 Camaro Vert Engine: 02 LS1, HX40 Transmission: 2002 LS1 M6 | Quote: Originally posted by Pepsicola
What is the purpose of the "Diverter Valve"??? I have been reading about if it(A.I.R.) is nessesary to have to pass emissions. I know it is needed to pass visual( i dont have a visual) but is it needed for the siffer??????
btw..thanks for the pics (i know its gonna help me sometime) |
if im wrong, someone please correct me:
the orignal factory cats needed O2 to work properly.... the problem is, all the O2 is used if the motor is running properly. so they solved this issue by pumping air directly into the cat.
when the computer decides the cat needs air, it uses the diverter valve to divert the air into the cat.
i think thats right... | |
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03-12-2004, 02:57 PM
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#6 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by MrDude_1
if im wrong, someone please correct me:
the orignal factory cats needed O2 to work properly.... the problem is, all the O2 is used if the motor is running properly. so they solved this issue by pumping air directly into the cat.
when the computer decides the cat needs air, it uses the diverter valve to divert the air into the cat.
i think thats right... | Yea it is along those lines for the most part. It also helps combust any remaining fuel that gets into the cat on startup when the car runs a bit rich. You do not need AIR to pass the sniffer but you do for visual. | |
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03-12-2004, 03:52 PM
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#7 | | Member
Join Date: May 2003 Location: Charlotte, NC
Posts: 432
Car: The Camaro, an '01 Alero (which the wife drives), and an '01 S10 (my daily) Engine: L03, 3.4L 6, 2.2L 4 banger Transmission: all autos | In 2005, my state is going to OBD2 emissions testing only, which means any car 1997 and older won't be required to have an emissions test, not even a tailpipe. If I remove the AIR stuff and leave the cat, plug the AIR tube on it, will it hurt the cat at all?? Does it need that to work properly? Just wondering.
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1989 RS, L03 305 +.030", 700R4, 16" '91 Z28 Rims, Dynomax cat and cat back exhaust, Hedman TEMS, Wonder bar, IROC stabilizer bar and steering box, Accel 8mm wires, injector pod spacer, 45k Volt coil, New Maui Blue Metallic paint. Soon to come: 3.23s, shift kit | |
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03-12-2004, 04:00 PM
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#8 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by 3rdgenstm
In 2005, my state is going to OBD2 emissions testing only, which means any car 1997 and older won't be required to have an emissions test, not even a tailpipe. If I remove the AIR stuff and leave the cat, plug the AIR tube on it, will it hurt the cat at all?? Does it need that to work properly? Just wondering. | The verdict is still out on that one. I have sen new cats fail with the air tube pluged. Mine is not plugeed yet but I am worried that my $$ CatCo cat will plug because I have th air tube capped off. The never gets driven so it is not like time will tell. I would just cap it but be aware of any sudden drop in performance as times goes on. You may want to replace it with a cat that does not have an AIR tube. | |
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03-12-2004, 09:26 PM
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#9 | | Senior Member
Join Date: Feb 2003 Location: Glen Allen, VA
Posts: 5,738
| Good info. I just did this today. Took me all of 15 minutes max to get everything out. Ofcourse I only removed the air stuff, and not the manifolds and stuff like you. I've read before where a lot of people have problems with this, but this was honestly one of the easiest mods I have done to my car. I didn't even have problems with the torx bits. I even used the stock belt because I have the smog delete pulley and everything looks factory. | |
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03-12-2004, 10:56 PM
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#10 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by 25THRSS
Good info. I just did this today. Took me all of 15 minutes max to get everything out. Ofcourse I only removed the air stuff, and not the manifolds and stuff like you. I've read before where a lot of people have problems with this, but this was honestly one of the easiest mods I have done to my car. I didn't even have problems with the torx bits. I even used the stock belt because I have the smog delete pulley and everything looks factory. | See isn't it so easy? A lot of people get scared because they get the AC and EGR confuesed with the AIR. When I took these pics I just peiced the stuff together and it took like 5 minutes. There were only clamps that held everything together. It really just comes right out without much struggle. | |
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03-14-2004, 02:40 PM
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#11 | | TGO Supporter
Join Date: Nov 2001 Location: Maryland; USA
Posts: 11,612
| nice job man, well worth the extra space and i still pass emissions fine. | |
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03-15-2004, 06:41 PM
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#12 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Here is a front view of the smog pmup with the pulley removed. You can see the two bolt holes where it attaches to the accessory bracket. | |
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03-15-2004, 06:42 PM
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#13 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Here is a rear view of the smog pump where the main connection is. | |
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03-27-2004, 07:51 PM
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#14 | | Senior Member
Join Date: Feb 2003 Location: THE QUADS
Posts: 1,122
Car: FBODYS Engine: ALWAYS 8'S Transmission: ALWAYS MENTAL Axle/Gears: RUSTY AND BRAND NEW | I want to know power gains by removing the a.i.r. pump and cat. Baisicly all the smog stuff. There is no smog tests where I live.
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Last edited by VERTIGO Z28 : 03-28-2004 at 09:06 PM.
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03-28-2004, 05:14 PM
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#15 | | Moderator
Join Date: May 2001 Location: Your neighbor's hood, MD
Posts: 2,154
Car: 1987 Camaro Z28 IROC-Z Engine: 5.7L TPI Transmission: T5 Axle/Gears: 3.42:1 | Quote: Originally posted by KEVIN L.
I want to know power gains by removing the a.i.r. pump and cat. Baisicly all the smog stuff. There is no smog tests where I live. |
Gains? .0021 RWHP.  Seriously, nothing worth mentioning or hacking up a car for, let alone smell! | |
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03-28-2004, 07:35 PM
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#16 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by ES87iroc
Gains? .0021 RWHP. Seriously, nothing worth mentioning or hacking up a car for, let alone smell! | People remove it when they go with non AIR headers. I still run a cat but I do not have AIR. It strips your car of a few pounds and makes things look nicer. However, if you remove the AIR system but leave the pump on it will sieze up and cause parasitic power losses. | |
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03-28-2004, 09:06 PM
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#17 | | Senior Member
Join Date: Feb 2003 Location: THE QUADS
Posts: 1,122
Car: FBODYS Engine: ALWAYS 8'S Transmission: ALWAYS MENTAL Axle/Gears: RUSTY AND BRAND NEW | At this point in the game I want it to look clean and run a little easier. I'm not lookin to gain alot of HP from this mod I was just curious. When I stand and look at it I can visualize the bay without it and I think it would improve the amount of working area. | |
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03-31-2004, 08:29 PM
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#18 | | Member
Join Date: Apr 2003 Location: Newport News, VA
Posts: 100
Car: 1992 Z28, modded and real purty Engine: 5.7 TPI with fixin's Transmission: TH700r4 Axle/Gears: 3.23 posi | Quote: Originally posted by 25THRSS
Good info. I just did this today. Took me all of 15 minutes max to get everything out. Ofcourse I only removed the air stuff, and not the manifolds and stuff like you. I've read before where a lot of people have problems with this, but this was honestly one of the easiest mods I have done to my car. I didn't even have problems with the torx bits. I even used the stock belt because I have the smog delete pulley and everything looks factory. | Where could a guy find that delete pulley, eh  | |
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03-31-2004, 08:32 PM
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#19 | | Senior Member
Join Date: Feb 2003 Location: Glen Allen, VA
Posts: 5,738
| gmpartsdirect.com I can't remember the part # right now, but do a search for smog pump delete pulley. I wanna say it's 10186167, but it's been a while now. | |
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03-31-2004, 09:48 PM
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#20 | | Junior Member
Join Date: Mar 2004
Posts: 20
Car: 1987 GTA | Just so im sure on this. Are you guy's sayin it will do no damage or hurt performance if I remove the smog pump, diverter valve, then plug the converter connection? I would love to create a bit of space under the hood of my GTA. | |
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03-31-2004, 09:51 PM
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#21 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by vance
Just so im sure on this. Are you guy's sayin it will do no damage or hurt performance if I remove the smog pump, diverter valve, then plug the converter connection? I would love to create a bit of space under the hood of my GTA. | You won't hurt performance and if any you will gain a pony or two. The thing is with your cat. Cats with air tubes need the air to function properly. If not they will clog because of incompleted combustion. You may want to upgrade to a high flow cat with no air tube. | |
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03-31-2004, 10:23 PM
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#22 | | Junior Member
Join Date: Mar 2004
Posts: 20
Car: 1987 GTA | thanks for the info .. prob a good idea to just wait untill i replace the stock exhaust and take the pump off then. | |
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03-31-2004, 10:27 PM
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#23 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by vance
thanks for the info .. prob a good idea to just wait untill i replace the stock exhaust and take the pump off then. | Yup. I left my smog stuff alone unitl I could do it right with my head install. It is not worth it otherwise. | |
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04-02-2004, 06:46 AM
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#24 | | Member
Join Date: Sep 2003 Location: Kalamazoo, MI
Posts: 120
Car: 88 sc. convert Engine: 305 TBI Transmission: Formerly 700-Now T5 | I've had my pump disconnected for years. I'm still running the pump, but it just blows air out the bottom of the car. It hasn't caused any problems so far. | |
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04-05-2004, 11:43 AM
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#25 | | Supporter/Moderator
Join Date: Feb 2001 Location: Cincinnati, OH
Posts: 10,976
Car: '90 RS Engine: LO3 Transmission: T5 | Quote: Originally posted by crnsuperduty
I've had my pump disconnected for years. I'm still running the pump, but it just blows air out the bottom of the car. It hasn't caused any problems so far. | You are lucky but keep an eye on it. Both my and my buddies AIR pumps started to go south after leaving them on for about a year. You will hear some crazy sounds when it starts to go. | |
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04-05-2004, 12:55 PM
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#26 | | Member
Join Date: Sep 2003 Location: Kalamazoo, MI
Posts: 120
Car: 88 sc. convert Engine: 305 TBI Transmission: Formerly 700-Now T5 | I may look for that pulley, since my engine is out right now anyhow. | |
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04-11-2004, 01:51 PM
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#27 | | Senior Member
Join Date: Mar 2000 Location: Orland Park, IL, USA
Posts: 1,422
Car: 88 IROC-Z/91 Formula Engine: L98/L98 Transmission: TH350/700R4 Axle/Gears: 3.45/3.27 | | |
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04-12-2004, 12:08 AM
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#28 | | Senior Member | | | |
