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2001 ford focus ideals rough , run great higher speeds

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May be a vacuum line loose or cracked. Check those lines from base of carburetor or manifold.

Posted on Sep 07, 2010

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2001 Ford Focus not accelerating properly

check your fuel filter and fuel pump pressure

May 21, 2013 | 2001 Ford Focus

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Does the speed sensor being bad make the engine run rough?

Yes the speed sensor could affect the cruise control, no it would not have any affect on the engine performance.

Jan 31, 2013 | 2001 Ford Focus

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2001 ford escort zx2 changed o2 sensors still runs rough in idle. when i turn ac on it helps. any ideals what the problem could be?

I would suspect a vacuum leak to be causing the rough idle. When you turn the A/C on the idle control solenoid raises the RPM's in order to compensate for the added load to the engine. Take a can of WD-40 or Carb cleaner and spray it around the intake manifold and any accessible vacuum lines, when the spray comes across a vacuum leak the engine idle will smooth out and usually increase in speed. Once this is done replace or reconnect whatever the fault may have been.

Aug 23, 2012 | Ford Escort Cars & Trucks

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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

Car runs very rough at stops, dies at times but restarts, higher speeds runs great ,smooth. At idle sounds like vaccum leak inside throttlebody also slight manifolds to eng. head air leak, engine shakes...

There is a TSB for the PCV hose. The elbows at both ends get holes in the underside that you can't see unless you remove them and look. This is a very, very common issue on the ZX2. You can get a new PCV hose with both elbows for about $30 from the Ford dealership. You only need to remove the air intake to gain access to the PCV hose to replace it.

Mar 25, 2011 | 2001 Ford Escort ZX2

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

2001 dodge caravan 3.3l v6 dtc 0700 & 0740

If it ran out of gas you may have sediment in the fuel lines causing rough running which may trigger a transmission code due to improper vacuum due to the rough running.

Feb 24, 2010 | Dodge Caravan Cars & Trucks

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

1 Answer

Engine shutting off

Have you changed the plugs? Have you cleaned the ide speed control valve?

Sep 14, 2008 | 2001 Ford Focus

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