MWall292 Posted September 8, 2023 Report Share Posted September 8, 2023 https://imgur.com/a/K2sLidd G4 Storm top board plug n play in a '98 EJ20K STi What would cause a log to just flatline like this but maintain connection? It's like it froze for 15 mins or so and picked back up at the end. If I Play the log, the value list stops moving at like 12:20. If I scroll through the value list, the time plot jumps over the whole flatlined section and picks up again at roughly 27:00. I also had this happen the other day: ECT and MAP were fluctuating constantly super fast like a pulsing signal. Temp changes glitching back and forth from roughly 86 to 71 at idle. My misfire perfectly synced to that fluctuating signal pulse. Attempting to log this resulted in a 900+ minutes long log that was nothing but a flatline with a throttle blip at the end. No where near what happened in reality. ECU issue, connection issue, or electrical issue? Quote Link to comment Share on other sites More sharing options...
koracing Posted November 1, 2023 Report Share Posted November 1, 2023 Bad ground, bad power supply, wiring, non-resistor spark plugs, etc. Lots of issues potentially. Ecu could be bad, but less likely than other possibly causes. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 1, 2023 Report Share Posted November 1, 2023 If there is a misfire occuring at the same time then I would be most suspicious of the main power supply or ground as just a comms issue is not going to cause a misfire. Can you attach or share the log file. Quote Link to comment Share on other sites More sharing options...
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