Quote:
Originally Posted by Redog
All the AIR pump does it inject a little bit of exhaust into the heads to help with start-up, that's it. The rest of the time, it does nothing 
(This is my 12,000th post   ) |
hmm..
Quote:
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Originally Posted by GM
Secondary AIR Injection System Description
Purpose
The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions. During Open-Loop fuel control, air is injected into the exhaust stream for a specified amount of time. Heat generated from post-combustion oxidation helps the catalytic converter reach operating temperature sooner, referred to as converter light off. The following conditions determine pump operation:
Start-up ECT and IAT must be more than 4.4°C (40°F) but less than 30°C (86°F).
Start-up BARO must be more than 75 GPA.
The start-up conditions will operate for 70 seconds or until the vehicle reaches Closed Loop.
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It's actually fresh air that is injected...
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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