Early Motronic idle speed controls are being discussed. Technician A says an idle air bypass device is used to increase idle speed when the engine is cold. Technician B says the rotary idle control valve is used to control idle speed at any engine temperature. Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct in stating that an idle air bypass device is used to increase idle speed when the engine is cold, which helps the engine run smoothly during warm-up. Technician B is correct in stating that a rotary idle control valve is used to control idle speed at any engine temperature, adjusting the amount of air bypassing the throttle plate to maintain the desired idle speed under various conditions.

Early Motronic Idle Speed Controls Are Being Discussed