Primer on How the Air Tubes Function
Thread Starter
Joined: Aug 1999
Posts: 19,282
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Primer on How the Air Tubes Function
Can anyone give me the basics?
JamesC
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JamesC
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Banned
Joined: Aug 2001
Posts: 246
Likes: 1
Basically they inject air into the exhaust on startup to help heat up the catalytic converter quicker and extend its life. When you dont have a cat anymore the airtubes just take up space. That's why mine are long gone 
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1991 Z28
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1991 Z28
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
On cold starts and in open loop, air is diverted to the exhaust manifolds to lean the richer startup mixture gases, to keep the cat from working hard and to reduce emissions. I'd guess this also could help from fouling the O2 sensor as well?, once in closed loop, air is diverted to the cat to aid in the catalytic reaction.
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