Originally Posted by
pbierre
I don't have any insider info on the ECU software. But my recent experience with misfires (fixed by new plugs and coils) is you can have random misfires without any DTC thrown. My suspicion is that the Misfire DTC looks for a repeating misfire on the same cylinder. If you pulled the coil off one spark-plug, and started up, that should throw a Misfire DTC. The Check Engine Light shows automatically once any engine-related DTC is activated. Bottom line: no DTC, VIDA can't help.
Drat. I expected an answer similar to this. I just wasn't sure if I could use the plotting/graphing function on some sensor in order to monitor anything in order to add the human element and say "aha theres a misfire!" ... I just replaced all my plugs last year perhaps I should look at the coils. Maybe I'll start by just ohming them out and making sure i dont have a short or ground fault. Typical millenial here looking for an easy answer without throwing $250 at it LOL
Hers- 04 XC70 2.5T, 300KM
His- 04 S60 2.4, 310KM
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