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rough idle

  1. SVT Performance (2002-2004)
    I have a 2002 Ford Focus SVT that came with a short ram intake, otherwise stock. I had issues before with the car stalling when braking, resulting in me changing out the IAC valve. I was glad to see that it no longer stalled, but I do feel and see the rpm lower and raise, ranging from 400rpm to...
  2. MK3 Focus
    2012 Mk3 Focus S, 5SP, never tuned, 110k miles. Relevant Mods: K&N Drop-In Optima Yellowtop (fairly new) Mustang TB Been an ongoing issue for a few months now, the start seems to have corresponded with the recall that was put out, and seems to have been made worse with the 2nd flash Ford did...
  3. General Technical Chat
    Type of car 2014 Ford Focus S Manual - not plagued by the automatic transmission 82,000 KM Issue Cold start, idle is pretty rough until the car warms up Once the car warms up, Idle is mildly rough. When you stop the car and the idle regulates you can feel small shudders in the steering wheel...
  4. DURATEC Performance (2003-2007)
    So I recently installed a cheap (and I mean CHEAP!) cold air intake on my car. I found it online for around $60 and wanted to see if it made a big difference before I invested money in a quality intake. Well it did make a difference, the car runs great, just a few minor problems. Occasionally...
  5. General Technical Chat
    Hey guys I have a 2001 focus with a zetec engine and auto trans. It has a rough idle when I start it (only on cold starts), also drives kinda rough until the engine warms up. Once the car is warmed up it starts/ drives great. I am not getting any relevant engine codes (only "EVAP small leak...
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