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Thanks for the reply. I replaced the ignition coil with a new one. Everything is fine.
No ignition problems to date.

I didn't record while cranking. The car starts and idles fine. Tomorrow will replace high voltage wires and a coil.
Attach throttling waveform.

The car (1.6 ZETEC SE, two camshafts) with check engine light came on. The fault - misfire on cylinder 4. The owner replaced spark plugs before. Right after the replacement the car was running good, but later starts hesitating on sudden acceleration. According to the piezo transducer’s waveform can ...