Consequences of Eliminating AIR tubes???
Consequences of Eliminating AIR tubes??? I just found these block off plates that go over the AIR connections that come out of the headers. What is the purpose of the AIR system, and is there anything wrong with removing the AIR tubes and check valves? Thanks 
TECH Apprentice
Joined: Oct 2002
Posts: 310
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From: san Antonio
Re: Consequences of Eliminating AIR tubes??? The only consequences that I know of is unless you have edit you will get the occasional check engine light.....and it might increase emissions....but I do believe that's it???
TECH Resident
Joined: Nov 2002
Posts: 996
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Re: Consequences of Eliminating AIR tubes??? It is my understanding that the air pump injects fresh air into your exhaust to help the cats operate more efficiently when the engine is first started up.
If you have no cats, the air tubes do nothing.
I have no cats, but I still have everything connected in case I want to reinstall cats in the future. Removing the air tubes will yield no performance gain, but it will clean up the look of the engine compartment.
Good luck!
Tommy
If you have no cats, the air tubes do nothing.
I have no cats, but I still have everything connected in case I want to reinstall cats in the future. Removing the air tubes will yield no performance gain, but it will clean up the look of the engine compartment.
Good luck!
Tommy
Re: Consequences of Eliminating AIR tubes??? I have O2 simms since I have Hooker LT's and ORY-pipe, but I still have my AIR system hooked up. Since I have simms can I just dissconnect it all and not throw any codes since the simms are telling the computer everything's fine already?
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TECH Resident
Joined: Jan 2002
Posts: 754
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From: USA
Re: Consequences of Eliminating AIR tubes??? DO not take the AIR off.
On cold start the AFR is too rich, this would cause the O2s which are also to cold to be reporting too rich when it really is not and the injector pulse width is set lean by PCM, then engine and O2s get up to operating temps but the pulse width would be still set from the false rich startup conditions.
AIR injects air in so that the false rich condition is leaned out for about 2 minutes of cold idle and then the AIR pump is shut off and has zero effect to performance.
On cold start the AFR is too rich, this would cause the O2s which are also to cold to be reporting too rich when it really is not and the injector pulse width is set lean by PCM, then engine and O2s get up to operating temps but the pulse width would be still set from the false rich startup conditions.
AIR injects air in so that the false rich condition is leaned out for about 2 minutes of cold idle and then the AIR pump is shut off and has zero effect to performance.
I just found these block off plates that go over the AIR connections that come out of the headers. What is the purpose of the AIR system, and is there anything wrong with removing the AIR tubes and check valves? Thanks
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Re: Consequences of Eliminating AIR tubes???
DO not take the AIR off.
My reason for not removing the AIR on you car is where you live. The AIR system isn't hurting HP and could become a PITA when your number is called for emissions testing.
TECH Apprentice
Joined: Oct 2002
Posts: 310
Likes: 0
From: san Antonio
Re: Consequences of Eliminating AIR tubes???
DO not take the AIR off.
On cold start the AFR is too rich, this would cause the O2s which are also to cold to be reporting too rich when it really is not and the injector pulse width is set lean by PCM, then engine and O2s get up to operating temps but the pulse width would be still set from the false rich startup conditions.
AIR injects air in so that the false rich condition is leaned out for about 2 minutes of cold idle and then the AIR pump is shut off and has zero effect to performance.
On cold start the AFR is too rich, this would cause the O2s which are also to cold to be reporting too rich when it really is not and the injector pulse width is set lean by PCM, then engine and O2s get up to operating temps but the pulse width would be still set from the false rich startup conditions.
AIR injects air in so that the false rich condition is leaned out for about 2 minutes of cold idle and then the AIR pump is shut off and has zero effect to performance.
Is there any truth to this??? This is the first I've ever heard of it? I figured the AIR was just for emissions??
Re: Consequences of Eliminating AIR tubes??? This is how I understand it....
The PCM ignores the 02 sensors on startup. Has to go into closed loop before the 02s are used. The AIR pump's ONLY purpose, on an LS1, is to heat up the Cats sooner. They are plumbed in AFTER the front 02 sensors. Sooner the Cats light off, the sooner they begin to clean up the exhaust.
Paul
The PCM ignores the 02 sensors on startup. Has to go into closed loop before the 02s are used. The AIR pump's ONLY purpose, on an LS1, is to heat up the Cats sooner. They are plumbed in AFTER the front 02 sensors. Sooner the Cats light off, the sooner they begin to clean up the exhaust.
Paul
