In addition to flashing the MIL, how do many OBD II PCMs react to a "Type A" (severe) cylinder misfire?
A) The PCM turns off the spark for the misfiring cylinder.
B) The PCM turns off the fuel injector for the misfiring cylinder.
C) The PCM increases fuel delivery for the misfiring cylinder in order to allow the extra unburned fuel to cool the catalytic converter.
D) The PCM energizes an oil solenoid which allows a specially designed lifter to collapse, resulting in keeping the exhaust valve closed so as to block exhaust flow from the misfiring cylinder.

Question

Quizplus · Accepted Answer

The PCM turns off the fuel injector for the misfiring cylinder to prevent unburned fuel from entering the exhaust system, which could damage the catalytic converter. This is a common strategy to protect the vehicle's emission control systems while alerting the driver to a severe misfire condition.

In Addition to Flashing the MIL, How Do Many OBD