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Old 12-05-2011, 13:02   #1 (permalink)
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Ford Focus rough idle

Can anyone help? My 2008 Focus with 37000 miles has an erratic idle typically fluctuating 200-300 rpm when hot. The dealer has had the vehicle in twice now to cure this problem and have re flashed, then replaced the PCM, no difference. I'm taking my Focus back soon for yet another go. Any ideas what might be causing this. The idle is worse with the A/C on. Mostly steady when cold.
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Old 12-05-2011, 15:38   #2 (permalink)
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Re: Ford Focus rough idle

Maybe have them clean or re-place the AIC. (Air idle control valve) on the intake manifold.

That seems to be a consistent problem on the newer 05-08 focus's that reach that many miles. That would be my first guess.
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Old 12-11-2011, 20:50   #3 (permalink)
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Re: Ford Focus rough idle

I concur, sounds like an IAC problem if the engine won't compensate for the added load of running the A/C
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Old 12-12-2011, 12:38   #4 (permalink)
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Re: Ford Focus rough idle

Good catch^, I meant to say IAC, which is still on the intake manifold.
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