The secondary air system is designed to enable catalytic converter to heat up and reach its operating temperature more quickly after a cold start.
Principle of operation
Due to extra mixture enrichment during cold-start phase, an increased amount of unburnt hydrocarbons is carried in exhaust gas. The secondary air system improves the afterburning (oxidation) process in the catalytic converter, and in this way reduces toxic emissions. Heat generated by oxidation accelerates "light off" of catalytic converter and significantly improves exhaust gas quality during warm-up.
Showing posts with label vacuum. Show all posts
Showing posts with label vacuum. Show all posts
Monday, November 1, 2010
Audi A6 C5 4.2L V8 5V BAS Secondary Air Injection Maintenance
10:19 PM by onesecond
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Labels: 2l, air injection, Audi, audi a6, bas, catalytic converter, cold start, cylinder head, engine control module, exhaust gas, gas quality, inlet valve, mixture, oxidation process, ports, principle, toxic emissions, unburnt hydrocarbons, vacuum
Labels: 2l, air injection, Audi, audi a6, bas, catalytic converter, cold start, cylinder head, engine control module, exhaust gas, gas quality, inlet valve, mixture, oxidation process, ports, principle, toxic emissions, unburnt hydrocarbons, vacuum
Saturday, May 29, 2010
2005 Ford Taurus Engine Controls Vacuum Leakage Noise Possible DTC's
11:30 PM by onesecond
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Labels: 0l, 2005 ford taurus, actuator, diagnosis, dtc, electrical connector, engine oil, Ford, ford taurus, indicator lamp, intake manifold, Lincoln, lincoln ls, procedure steps, retainers, sable, upper intake manifold, vacuum, valve action
Labels: 0l, 2005 ford taurus, actuator, diagnosis, dtc, electrical connector, engine oil, Ford, ford taurus, indicator lamp, intake manifold, Lincoln, lincoln ls, procedure steps, retainers, sable, upper intake manifold, vacuum, valve action
Some 2005 Taurus and Sable vehicles equipped with a 3.0L 2V and some 2003-
2005 Lincoln LS vehicles equipped with a 3.0L 4V engine may exhibit a vacuum
leakage noise or lean codes and/or malfunction indicator lamp (MIL) on. The
cause may be a leak at the 0-ring on the intake manifold tuning (IMT) valve.
ACTION
Follow the Service Procedure steps to correct the condition.
2005 Lincoln LS vehicles equipped with a 3.0L 4V engine may exhibit a vacuum
leakage noise or lean codes and/or malfunction indicator lamp (MIL) on. The
cause may be a leak at the 0-ring on the intake manifold tuning (IMT) valve.
ACTION
Follow the Service Procedure steps to correct the condition.
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