Misfires, jerking and cylinder shutdown caused by the transmission!

25.01.2024 14:38 • aktualizováno 25.12.2023 15:36
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A sympathetic young man came all the way from České Budělovice with his recently exchanged Seat Cupra 1,4 TSi for his original Opel Astra Tourer 1,6 CDTi. The original owner, however, had concealed the Seat's imperfections, which was impossible to drive after two days. After replacing several components on the engine, he gave up trying to repair it, wanting to solve the jerking, popping exhaust and cylinder #2 & #3 shutdowns forever.

When he parked the car in the FCD Garage that evening, I could already "guess" by the sound of the high-pressure pump and, from his indications, that I would be holding an oscilloscope and measuring the low and high fuel pressures. But I was wrong in my secret "prediction" on "fuel". It's good that I haven't been guessing aloud for at least ten years.

After ten minutes of staring at the graphics of the log recorded by the FCD Logger, everything was clear. The owner asked if the popping exhaust could be related to a fault stored in the automatic transmission control unit. I almost confidently dismissed it. But now I was knocking on my forehead. How could the transmission pop the exhaust and then shut off the injectors?

You can read the full case description and see how everything is connected. It's free to all readers!


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