#137903, "RE: buzzing noise from ecu" In response to In response to 0
They all have a buzz or high pitched whine to them, and they stay powered on for some time after the car is turned off to run O2 sensor heater tests.
As far as the idle quality, there's several things that could cause that. If it's not generating a misfire code or a target idle not reached or similar, don't worry too much about it.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
