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2001 focus engine runs rough idles poorly - 2001 Ford Focus

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Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Dec 29, 2010

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2001 FORD FOCUS IDEALS ROUGH


This is only a guess, because rough idle can be due to an infinity of reasons. On the Focus, assuming that the spark plugs and wires are all good (check that the wires are seated securely), then very often this is due to a problem with the vacuum lines or the Idle Air Control (IAC) valve. With the engine running, listen closely for any tell-tale hissing sound and try to locate it. Check that the vacuum hoses are all in good condition and that they are securely in place. The IAC is a little more complicated to check. Its job is to let air in when the throttle is closed. If it is not opening as it should then the engine will idle rough. One thing you can try is to remove the IAC entirely, leaving an opening for air to get into the intake manifold. If the engine idles better with the IAC removed, you will know that the IAC has a problem. It could be a problem with the IAC itself or with its circuit. Good luck, if you have any more questions let me know.

Mar 29, 2010 | 2001 Ford Focus

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