Misfire Counting Function
ECM memorizes misfire counts by categorizing types of misfire as shown below.
- "Cylinder-specific" combustion misfires
- "Emission limit" combustion misfires
- "Catalyst damage" combustion misfires
Smooth Running Signal
|
m/s 2 |
: Acceleration |
|
t |
: Time |
|
A |
: Engine running without combustion misfiring -> Acceleration values within tolerance range |
|
B |
: Engine running with combustion misfiring -> acceleration values too high |
|
C |
: Misfire counter -> starts with misfire detection |
Main factors of misfire occurrence
- Ignition system
- Injection system
- Mechanical engine components (e.g. valve seats, valve springs, air suction)
- Fuel starvation