ive noticed that many people like to remove the lines running from the exaust manfiold to the air box. What does this do? and possible where wan i get the parts to block it off my self. finally if i remove these hoses and block off the holes will i thorow a code. -

thanks john

 

most people (including myself) remove the air just to clean up the engine bay a little. You can by the plates from thunderacing. And yes, your car will throw a code.

 

But you can get the code taken care of with LS1 edit

 

Removing the AIR system cleans up the engine bay a bit, removes weight from the front end, and also by just removing it - you avoid messing up the check valves, or whatever after you install headers (which sometimes happens - giving you a sound like an exhaust leak)

 

what are the a.i.r. hoses for and do you gain any power by removing them if you are sticking with stock manifolds?

 

but it has to serve a purpose gm put it there to so something and why does it connect to my air box???? o yea pritty funny stuff (butt o meter)

 

The reason it hooks to your airbox is because it is an air pump - therefore it has to get air to pump into the exhaust manifolds. As far as what it does - I believe its function is to help the cats heat up quicker on initial startup - therefore helping emisissions.

 

Main reason....it makes the car look nicer and you don't have that sound of a Hover vacuum running under your hood when you crank up

Now....I did sit down and think about it for a while (while I was removing it) and come to the following conclusion:

1) As the exhaust pulse exits the port and travels down the header, the lead end is high pressure and the tail end is low pressure

2) The low pressure areas can be used to make a "vaccum" in the header and pull exhaust out of the heads

3) The more area you have to make a vacuum in, the less of an overall vacuum you will have

4) The air pipes in essence increase the inside area of the exhaust manifold thus increasing the amount of area needed to pull a vacuum on

5) With them removed, you should pull a better vacuum with each exhaust pulse and thus increase hp


Now.....with that all said, it's theory....I have not tested it (dyno) and I'm not sure you could really notice the difference (I didn't feel it in the butt-o-meter).

Do it because you want the engine clean....THEN once its done and people ask you how much power you got...."Oh man...you would not believe what that did....I got 25 hp just from pulling that off <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> "

Chris

 

The only point I did not see is:

Borderline emission vehicles can take advantage of the 'fresh air' supplied by toggling on said air pump. It can make the emissions sniff tester pass vs. fail.

 

Funny you should mention that. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> On one of my older S-10's that had an electric pump, I wired a switch in to manually turn it on for emissions testing here. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

I don't think it's listed on there as it's not a primary function for this system. From there, the EGR takes that role over.

 

I left mine on becuase they actually do a visual ispection for it here in Houston. Now there are ways around that, but, I don't have to worry about that.

Mike

 

im leavin mine alone. but thanks for all your opnions

 

Here, right from GM. I am highly against removing this as I am against removing EGR systems. GM put them there for a reason. Here it is....

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Secondary AIR Injection System Description

The Secondary Air Injection (AIR) system helps reduce Hydrocarbon (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOx) exhaust emissions. It also heats up the warm up 3-way catalytic converters quickly on engine start-up so conversion of exhaust gases can occur sooner.

The system includes the following:

- AIR pump - The AIR pump is mounted to the lower left front of the engine Compartment and supplies the air to the AIR system. The electric air pump pressurizes fresh air and pumps it to the check valves near the exhaust manifolds. The AIR pump is controlled by the PCM. Battery voltage to the AIR pump is controlled by the AIR pump relay. An integral stop valve prevents air flow through the pump during OFF periods. When the PCM provides a ground circuit for the secondary AIR pump relay, battery voltage is allowed to power up the AIR pump and integral stop valve.

- Vacuum Bleed Valve - This valve helps prevent vacuum buildup within the AIR system, which could prevent the integral stop valve from opening. The bleed valve is controlled by the air pump relay and is energized when the AIR pump is commanded ON. If the vacuum relief system is not functioning, the vacuum will cause the AIR pump integral stop valve not to open. This may result in no air flow to the exhaust manifolds or delay the delivery of air which may not allow the diagnostic to pass.

- Check valves - The check valves prevent back flow of exhaust gases into the AIR pump in the event of an exhaust backfire.

- Necessary plumbing.
- Hoses
- Pipes
- Clamps

The AIR pump with integral stop valve is controlled by the PCM. The PCM will turn ON the AIR pump by providing the ground to complete the circuit which energizes the AIR pump relay. When air to the exhaust ports is desired, the PCM will turn ON the integral stop valve and then the AIR pump.

The PCM turns ON the AIR pump during startup any time engine coolant temperature is above -10°C (14°F). The AIR pump operates for a maximum of 240 seconds, or until the system enters Closed Loop operation. At the same time the PCM turns the AIR pump OFF, it also de-energizes the integral stop valve solenoid so no air is directed to the exhaust ports.

The AIR system will be disabled under the following conditions:

- When the PCM recognizes a condition and sets a diagnostic trouble code.
- When the fuel system is operating in Closed Loop.
- The AIR pump has been ON for 240 seconds.
- Engine Speed is greater than 2825 RPM.
- MAP is greater than 96 kPa with VSS over 60 mph.
- MAP is less than 20 kPa.
- ECT less than -10°C (14°F).
- 3-way catalytic converters over temperature detected.
- Short and long term fuel trim are not in the normal range.
- Power enrichment is detected.

Results of Incorrect Operation

If no air (oxygen) flow enters the exhaust stream
at the exhaust ports, HC and CO emission levels will be too high.

Air flowing to the exhaust ports at all times could increase temperature of the warm up 3-way catalytic converter.

Diagnostic Trouble Codes P0410, P0412, P1415, and P1416 will set if there is a malfunction in the following components:

- The AIR pump.
- The AIR pump relay.
- Hoses or pipes that are leaking.
- The Check valves that are leaking.
- Circuits going to the AIR pump and the AIR pump relay.
- The vacuum bleed valve.

AIR Pump

The AIR pump is a regenerative turbine type which is permanently lubricated and requires no periodic maintenance.

The engine should be at normal operating temperature in neutral at idle. Using the scan tool enable the AIR pump system. Select HO2S voltages for both Bank 1 and Bank 2 HO2S. The HO2S voltages for both sensors should remain under 350 mV because air is being directed to the exhaust ports. If the HO2S voltages remain low during the Output Test, the AIR pump and integral stop valve are operating satisfactorily. If the HO2S voltage does not remain low when the AIR pump is enabled, inspect for the following:

- For voltage at the Air Pump when it is energized.
- For a seized AIR pump.
- Hoses, pipes and all connections for leaks and proper routing.
- For air flow going to the exhaust ports.
- AIR pump for proper mounting.
- Hoses and Pipes for deterioration or holes.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">So as noted above, when in "power enrichment" (wide open throttle for those that don't understand) and RPM's OVER 2,825rpm, it is OFF!! Just like the EGR system! Hmmm, no performance gain to be had by removing it!

 

Hmmmmm.... No performance gain, but it looks better under the hood!!!

As I read that was the main reason right?

Keep them at WOT (Wide Open Throttle)

 

It's a subjective thing. I find beauty though along the lines of "form follows function" so I don't have a problem with them anyway. Plus since the majority of it's plumbing is under the cowl, who sees it anyway.

To me (and this is just me), if there is NO gain to be had, but daily driveability suffers as does fuel economy, you sorta shooting yourself in the foot to spite yourself.

But hey, you'll look good doing it! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

Bring this back from the dead here...

All the AIR system seems to do is reduce HC, CO, NOx, which is done post combustion (in exhaust pipe), so how would it affect fuel economy for the better? And how does it extend the life of the cats? If it means I have to replace them every 100K miles vs. 200K, that's not a problem.

 

wow, I would really like to see some hard evidence to back that up, wtf?

 

it might help or even hurt economy with the egr. the air would have no effect on economy, just emmisions but only uppon startup and only alil after.. reason the egr might help economy, soposedly it has some unburnt fuel in it, mostly carbon if you ask me.. but it also is hot air... hot air = less dense =less power+ less fuel needed+ the soposedly unburnt fuel, id say a better ignition system would be a better idea to burn more gas inside the combustion chamber where its soposed to. not going up the egr tube along with mostly burnt gasses. if you look at it this way cai's soposedly increase mileage and power. what do they do? let more FRESH air into the engine.. i took my egr off. the idea of carbon , etc going into the intake ? makes me want to shoot the hippies complaining about emmisions. volcanos pollute more then any amount of cars.. i have yet to see or beleive anything other then the natural course of nature is changing the climate, if at all.+ wouldnt burnt fuel for no power output, or detrimental output be more of waste? .. greenhouse effect? you ask me, its getting colder(atleast in nj it was a lot longer +colder then the average winter of my 21 yrs of living here) not hotter. or just a climate shift like el nino some crap.air, i left on for now, the idea behind it doesnt bother me, or rather i dont think it has detrimental effects on my car like egr.. egr though, h311 look inside you egr dump tube. you want all that crap in you engine ? i rather have the ses light then egr. i might modify my air setup to get rid of some of the tube , or just take it off if i can find a local tune. the air just heats up the cats when cold. so they do nothing the majority of the time your driving.

 

Hay thats a great pile of you've posted there.

I started reading thinking hay maybe they know something but ended up in total dis-belief.

-21 years is not very long in geological or climate past.

-Check out the theory of Global Dimming for human affect on the environment.

-Volcano's do not polute as they are part of the natural cycle of the Earth and have been erupting for billions of years!

-El Nino is not climate change it is a phenomenon that occurs, it's opporsit is La Nina although on many years neither occur. These processes have been in existance since before mankind.

EGR introduces an inert gas into the cobustioin chamber which reduces PEAK combustion temps which in turn reduce Nox emissions.

EGR runs all the time except at WOT (wide open throttle) so it has zero affect on PEAK power. It is also unlikely to affect mpg.

Many engines (LS1 01-04, Jaguar AJV8) have a degree of internal EGR due to the cam profile. This is why 01+ LS1's do not have external EGR systems. However the internal process of introducing an inert gas to reduce Nox emissions is exactly the same.

This has to be your best line though:
Where exactly do you think all that "crap" comes from in the first place? That's right in your engine.

Oh yeah ever thought of using ENGLISH along with sentences, full stops and grammar?

 

how can you say volcano's dont pollute. they make more pollutants in one eruption then all the cars running for a year.even if they are a natural process, its just something to compare to.. so maybe some environmentalist can go try and plug the volcanoes with there heads... that crap for the most part is going out the exhaust without the egr hooked up, not recycled over and over ..as for what the egr does im just going by what i read, where did you get your information??.. i didn't say mankind didn't have an effect, but i dont think the problem is only or even mostly based with cars. as much as the amount of humans there are. all of us breathing , makes what the gov calls pollutants. - you breathing produces more deadly gases faster then constant .. and check out a theory? - a theory is only a theory based on an idea not proof... i want proof. sorry if my grammar disturbs you. here in america, were not so ****.. so take your and roll in it. i'll be sure to give you more of this bad grammar .if its, as you say pumping inert gases into the combustion chamber. wouldnt that diminish reasons for having a 5.7 if i wasn't getting all of my 5.7l of combustion chamber dedicated to making power??? little as the egr effect is... i took my hefty egr off for good reason. if its not on a wot mine doesnt get much use...

21 yrs i know not long, but if your going to say that. the 100+yrs cars have been around is nothing, on that subject.

but as for me. until some proof on the whole bad gasses and there negative or even noticible effects can be proven. either way i continue to not like the tree 's


so time a for