The customer complains of poor fuel economy. A five-gas analyzer reveals these measurements at 2,500 rpm: HC = 72 ppm, CO = 3.2%, CO₂ = 10.3%, O₂ = 0.2%, and NO _X = 122 ppm. What is the most likely cause?

Question

Quizplus · Accepted Answer

The high CO (carbon monoxide) percentage indicates a rich fuel mixture. CO is produced in large amounts when there is too much fuel in the mixture and not enough oxygen for complete combustion.

The Customer Complains of Poor Fuel Economy