Which consequence results when electronic fuel injectors continuously dribble fuel into a stoichiometric combustion engine?

💡 Explanation

Uncontrolled fuel delivery floods the cylinder, so incomplete combustion during oxidation causes elevated hydrocarbon emissions due to rich mixture, rather than lean-misfire or knocks. An inefficient hydrocarbon oxidation reaction therefore increases tailpipe hydrocarbons, causing smog.

• Which risk increases when an engine crankshaft vibrates excessively at high RPM?
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