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How exhaust manifold cracking affect engine performance of an efi engine?

Anonymous

∙ 11y ago

Updated: 9/23/2023

Unmetered air entering the system before the Bank 1 or Bank 2 O2 sensor will send a false lean reading to the ECM. This could cause the ECM to extend the fuel trim. This could cause eccess fuel to pass through the catalaytic converter. This could cause damage to the catalytic converter. If the fuel trim stays below +25%, the check engine light may not illuminate so the problem may go undetected until the cat gets ruined.

Wiki User

∙ 11y ago

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