Question about 2000 Ford Focus

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Revs every now and again when idling my engine begins to race

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Check the O2 sensor that is attached just after the air filter. It may be dirty and could use a good cleaning or replace it.

I got this problem when I was messing with the throttle, I removed the hose that goes from the filter box to the throttle not knowing there was a sensor on that hose that tells the computer how much air is coming through the filter. So when I started the car without that hose attached, the sensor was not getting any air causing the engine to raise the RPMs until enough air was going through the sensor. Since it was not attached, the car redlined before I quickly shut it off.

If its dirty it will cause it to not read the airflow properly.

Posted on Oct 07, 2008


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How can I adjust my polo classic 1998 fuel injection revs.Normaly it idle on 900, but now increased to 1300 to 1600

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so my guess you mean, hot engine races,because cold engines all do that , by design.
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