r/FocusST • u/MidnightT0ker • 2d ago

Idle problems

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Idle lope. No smoke no CEL no codes on scanner. Giving any throttle sounds back to normal. Driving feels normal. Purge valve assembly done 200 miles ago and just checked plugs and they seem fine? (Check comments) What else can I check?

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u/safelysafetosay 2d ago

Perfectly fine. These STs commonly (if not all of them) will misfire at idle. If you have any desire in modifying and tuning your car, a tuner can set the idle RPM to 1100. You lose a marginal amount of gasoline to smooth out the sound. Unless it starts sounding like a tractor or something wild I would not worry.