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Carman scanFor EMS PROfesor
2.4 Field Service Example of Ignition Secondary Wave (3/3)
3. Field example of Ignition secondary wave : In case Compression ratio at cylinder is low
Avante 1.5L DOHC Vehicle is a normal at cold engine condition, engine gets
warmer, engine disorder happens.
Signal view
Since too much carbon was attached on intake valve stem, no problem at cold condition,
but engine gets warmer stem expands so that compression pressure gets lower because
stem can’t be closed well.
All vehicles used too much fuel annex to raise octane value, probability is high.
One of two ignition secondary wave discharging time is long and discharging voltage is
< Reference >
Since waves are different according to vehicle/ engine/ temperature of temperature, there
were no absolute standard. It should be compared when it is normal condition.
Pressure in cylinder is low