Question

technician a says that if the evap system continues to purge at idle, a rough idle could be created. technician b says that even a small fault in the evap system creates drivability issues. who is correct?

a. technician a
b. technician b
c. both technician a and technician b
d. neither technician a nor technician b

Explanation:

• Technician A: When the EVAP (Evaporative Emission Control) system purges at idle, it can introduce extra fuel - vapor mixture. At idle, the engine is running at a low, stable speed, and an improper fuel - air ratio (due to excessive purging) can cause a rough idle.
• Technician B: The EVAP system is part of the engine's fuel and emissions management. Even a small fault, like a tiny leak, can affect the fuel - air ratio (as the system is designed to manage fuel vapors precisely). This can lead to drivability issues such as poor acceleration, stalling, etc.

Answer:

C. Both Technician A and Technician B