![]() ![]() It is likely that the fault is causing erratic fluctuations of the crankshaft speed (or exhaust pressure pulses) which are not consistent to any one cylinder or group of cylinders. The fault code is indicating that there is a random misfire but it is not identifiable to specific cylinders. ![]() ![]() Also note that there is reference to manufacturers monitoring the strength of exhaust pressure pulses (which will be weak if a misfire exists) a weak pressure pulse is then linked to an individual cylinder by using cylinder identification sensors (cam shaft sensor etc). Misfires can also be detected by the oxygen / lambda sensor, due to high oxygen content (unburned oxygen) in the exhaust gas. Any fault with the cylinder, including mechanical faults, fuelling, ignition (petrol engines) or other faults affecting combustion, will affect the power / torque produced by the cylinder. Random / Multiple Cylinder Misfire DetectedĪ common method of detecting misfires is to monitor the signal from engine speed sensor to check crankshaft acceleration / speed during each power stroke this provides an indication of the power / torque contribution provided by the cylinder (compared to the other cylinders). ![]()
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