The computer will set a misfire code when it sees a lag in the signal from the crankshaft position sensor. If the crank's rotational speed suffers a power loss from a cylinder not putting out as much power as the others, the computer will set the misfire code for that cylinder, or if it cannot determine which cylinder is not producing the expected power, it will set the code for a random misfire.
Troubleshooting misfire codes generally involves checking gas, spark, and compression. One of those, or the lack of it, is usually responsible for misfires.
Hello
When the service engine
soon light a yellow light (Also called the check engine light or
engine management light) is turned on this is to alert you to the
fact that Powertrain Control Module (computer) has detected a
failure somewhere in the systems it controls you may not feel any
difference in the way the engine runs, this can be the transmission
or the engine or emission system, there are fault codes set in the
modules memory for these faults. What needs to happen now is to have
the powertrain control module scanned with a special tool called an
OBD2 electronic engine control scanner or a OBD2 code reader. Once
the code(s) are read then you must perform the diagnostics for each
code and make the appropriate repairs based on the findings of the
diagnosis that was performed, this is called doing "Pinpoint"
testing.
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