Question about 2000 Ford Focus

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Misfire and eratic idle on Ford Focus petrol 1.8i

My Focus has a misfire particularly noticeable at higher speeds, and also has an erratic idle speed for short amounts of time when you come to a stand, again more noticable when you come to standstill from higher speeds. Any thoughts?

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  • markbfd Jun 22, 2008

    my 2000,1.8 focus is revving at three thousand when its stood idle

  • credwards Dec 24, 2008

    2001 focus 1.6 misfire when on motorway over 70 ish and anything over 2500 rpm also idle eratic for short period when pulling up at lights etc. seems to happen more in colder weather.

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  • Ford Master
  • 1,224 Answers

Motor mounts need replacement and sounds like your cars comp. is about to take a hit and go down
the air flow control unit sounds like it also has has a clog in it and needs to be serviced this is a big one when you get to driving at higher speeds the fan turns off and the air outside controls cooling air/fuel mixture rate sometimes too much air intake can make the vehicle act eratic

Posted on May 21, 2008

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Posted on Jan 02, 2017

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MIGHT be the tps
The TPS is sensitive to heat, moisture and vibration leading to the failure of some units. The sensor is a sealed unit and cannot be repaired only replaced. A TPS may fail gradually leading to a number of symptoms which can include one or more of the following: -
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  • High Idle Speed: The TPS may report faulty values causing the engine idle speed to be increased above normal. This is normally found in conjunction with a slow engine return to idle speed symptom.
  • Slow engine return to idle: A failing TPS can report the minimum throttle position values incorrectly which can stop the engine entering idle mode when the throttle is closed. Normally when the throttle is closed the engine fuel injectors will be deactivated until a defined engine RPM speed is reached and the engine brought smoothly to idle speed. When failing a TPS will not report the throttle closed and fueling will continue causing the engine to return to idle very slowly.
  • Engine Hesitation on Throttle Application: The TPS is also used by the ECU to determine if the driver has applied the throttle quicker than the Manifold Air Pressure sensor can read. The fueling is adjusted acordingly to cope with the sudden increase in air volume, however a faulty sensor can cause the ECU to ignore this data and the engine will "hesitate" when applying the throttle. In extreme cases with the engine at idle, a sudden application of full throttle can stall the engine.
  • Engine Misfire: A fault TPS can report values outside the deined acceptable range causing the ECU to incorrectly fuel the engine. This is noticable as a slight misfire and can trigger the misfire detection software and/or Malfunction Indicator Lamp (MIL) light on the dashboard. Extreme cases can cause excessing misfires resulting in one or more cylinders being shut down to prevent engine and catalytic converter damage.
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  3. Turn the ignition off, remove the key and wait for the ECU to power down (about 30-40s).
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