| 21. | Most designs of the time therefore included secondary air injection, which injected air into the exhaust stream.
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| 22. | Also for 1999 provisions for a new air injection reaction system was introduced aimed at improving engine emissions.
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| 23. | Most newer vehicles have electronic fuel injection systems, and do not require air injection systems in their exhausts.
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| 24. | Since 2008, an expanded air injection system has been used alone to control and treat contaminants in groundwater.
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| 25. | A pilot groundwater aeration ( air injection ) system was added in 1992 to augment the pumpout system.
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| 26. | The early air injection diesels always had a superior combustion without the sharp increase in pressure during combustion.
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| 27. | A new catalytic converter was introduced with an air inlet for forced air injection from the air pump.
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| 28. | _A ban on the pre-slaughter practice of using air injections to the head intended to stun cattle before slaughter.
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| 29. | Additional air injection wells were placed in operation in 1995 to aerate the width of the contaminant plume while pumping continued.
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| 30. | All 2ZZ-GE heads from 03 / 03 onwards carry this modification even if the vehicle does not have the air injection system.
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