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2001 focus engine runs rough idles poorly - 2001 Ford Focus

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Please see my tip at . 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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2 Answers

Rough idle, parts store said emissions. what needs checked?

Vacuum lines. And check for residue buildup preventing throttle body from closing .

Jul 01, 2015 | 2001 Ford Focus

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2001 ford focus se sedann idle to high

How high is the idle? Any roughness? Some ideas who by the control the butterfly valve on the throttle, or the MAF (mass airflow sensor)

Dec 07, 2014 | 2001 Ford Focus

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2001 ford focus has rough idle when cold but runs fine afer heating up. I have had the car for a year and it is steadily gettin worse.

Make sure you are not lossing coolant..If its the sohc engine they are bad about internaly leaking coolant..

Oct 23, 2011 | 2001 Ford Focus

1 Answer

Had downstream oxygen sensor replaced in 2001 jetta v6. now it's loud when idling and runs rough.

Sounds like it was installed incorrectly. If that's the case you may have an exhaust leak and the sensor will not read the correct air/fuel ratio causing the engine to run poorly.

Mar 15, 2011 | 2001 Volkswagen Jetta TDI

1 Answer

Runs rough at idle and driving the check engine light is on

if it stumbles at idle it needs a egr valve (dirty,sticky)and then the light will stay off when turned off

Jun 27, 2010 | 2001 Ford Focus

2 Answers


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

1 Answer

Our 2001 ford focus when it idles it surges

Check the pcv hose for leaks at the intake manifold. Common problem.

Jan 19, 2010 | 2001 Ford Focus

1 Answer

Rough idle and engine will shut off after warm.

Check the exhaust manifold gasket. I have a 2003 SVT Focus I had a problem with it loping at low RPMs. I had a free flow exhaust system. When I bought a new exhaust manifold I replaced the gasket and the problem went away.

Apr 07, 2009 | 2001 Ford Focus

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