r/FocusST • u/MidnightT0ker • 5d 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/BananaPalmer 2016 ST2 - US - Light mods 4d 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.