Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Anti-Backfire Gulp Valve





The anti-backfire valve is located downstream from the air bypass valve, and its purpose Is to divert a portion of the thermactor air to the intake manifold when it is triggered by intake manifold vacuum signal on decel, that is, only during periods of sudden decrease in intake manifold pressure.