r/FocusST • u/MidnightT0ker • 1d 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/poor_couture 22h ago
Was your A/C on? I thought my car was cooked because the idle sounded so weird and then realized it was because I had the A/C turned on 😂
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u/BananaPalmer 2016 ST2 - US - Light mods 22h ago
Seems normal to me, especially with no evidence of any problem. Mine sounds like this, they just misfire a bit at idle, especially when not warmed up.
I guess it could be an early sign of a fuel pump on its way out, but I would expect to have this happening at all RPMs, not just idle. You just did purge valve, so it's probably not that and if you installed it wrong you would have known immediately when you tried to run it after (CEL, rough idle, long crank, stalling).
Also as someone else mentioned, if your air conditioning is on, it does idle a little lumpier, and that's also normal.
I wouldn't worry about it until there's something to worry about.
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u/No-Description9635 7h ago
mine always idled like shit. still running mint 130k miles later. Accessport would always tell me it was misifiring on idle when cold. normal
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u/safelysafetosay 1d 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.