anti-backfire valve

anti-backfire valve
(anti-BFV) Valve used in air injection reaction (exhaust emission control) system to prevent backfiring during the period immediately following sudden deceleration by diverting the air coming from the air pump away from the exhaust ports. Otherwise the exhaust gases which contain unburned gasoline could mix with fresh air and cause unwanted backfiring.
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Dictionary of automotive terms. 2015.

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