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Which unstable behavior results when stoichiometric miscalibration occurs in GDI?

A)Engine knocking and pre-ignition
B)Catalytic converter thermal runaway
C)Increased particulate matter emissions
D)Variable valve timing malfunction

💡 Explanation

Engine knocking arises due to auto-ignition from overly lean pockets undergoing unchecked Rapid Compression Heating because the fuel doesn't burn evenly during the power stroke; therefore localized hotspots ignite the remaining air/fuel mixture spontaneously, rather than uniform flame front propagation.

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