No sensor can be used to determine unambiguously whether a cylinder has ignite.
An indirect registration algorithm is include in the control units.
converters unlimited control unit analyzes uniformity of crankshaft rotation according to signals from the crankshaft position sensor.
Uneven rotation is considere a misfire under certain conditions
As a rule, deviations are taken as more than 0.2%.
Also, on cars with individual ignition coils, the coil control circuits are monitore, if the connector is remove from one coil, the control unit will mark this cylinder as inoperative.
Even if misfires were recorde reliably, and not by indirect indications, it would be incorrect to turn off the cylinder at one fixed pass.
The Control Unit has a misfire counter parameter for each cylinder. As a rule, the control unit decides that there are misfires and it is necessary to turn off cylinder if the number of misfires in any of cylinders exceeds a certain threshold set by the developers.
What is better to do when misfiring is detecte?
The first and most important thing that the converters unlimited unit does when detecting misfires is Check Engine lamp flashing.
This is one of the few reasons the check is flashing
There are so few that one can conclude with almost one hundred percent certainty: “check” is flashing, it means misfire.
The secon thing that the block does, is turning off the fuel supply to the cylinder in which gaps are fixe. Signals for opening simply cease to be given to the corresponding injector.
Do not wait till your converters unlimited cause any kind of problems to the vehicle. It may happen any time, so be careful with any sign of failure and control all the car parts in time to avoid expenses for converters unlimited replacement.