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secondary air / "smog" pump
"Idea 2: The engine has a Smog Pump which according to Toyota only is used to prevent backfiring."
the secondary air system has a Kombi valve or
Anti back fire valve
it is designed to prevent exhaust from flowing backwards to the secondary air / Smog pump and burning it up when secondary air is not active
if the smog pump fails from water ingestion , kombi valve is bad / leaking or car is submerged under water .
secondary air
is used to heat up the cat converter , when the system is cold , extra air is pumped into the exhaust , extra fuel is added to the engine by the ECM , the fuel and air burn in the hot exhaust and heat up the cat -
secondary air never functions when engine and cat are hot
secondary air is not designed to reduce back firing and in fact it will have no effect on back firing at all when working as designed
the pump will not flow enough air at any rpm to make any difference at all , if used / modified to pressurize the intake
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