Which issue arises if fuel injector pulse width on a modern gasoline engine malfunctions causing excessively long duration?

💡 Explanation

When injector pulse width is excessively long, over-fueling occurs because of prolonged injection, leading to a rich air-fuel ratio reaching the catalytic converter, causing high temperature exotherms that can overheat and damage the converter. Therefore, catalytic converter overheating occurs, rather than knocking, overcooling, or valve float that arise from opposite fuel conditions or mechanical factors.

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