Which effect arises from excessively lean fuel mixture in gasoline direct injection engine during cold start?

💡 Explanation

With a lean air-fuel mixture, especially during cold starts, incomplete combustion and stratification occur because fuel droplets do not fully vaporize, leading to unstable flame kernels and fluctuating cylinder pressures. Therefore increased combustion variability results, rather than overheating, reduced cat efficiency, or ring wear, which stem from separate issues.

• Which risk increases in a steel structure when heat-affected zone (HAZ) welding causes localized rapid heating?
• Which risk increases when a submarine telecommunications fiber optic cable experiences localized seawater ingress?
• Which outcome occurs when turbocharger shaft speed exceeds design limits in an engine?
• Which consequence results when a hydraulic actuator's check valve fails open in a high-speed injection molding machine?
• Which risk increases when excessive fuel accumulates within the cylinder during cold starts?
• Which risk increases when an LED matrix display operates continuously at high ambient temperature with inadequate airflow?