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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Runs rough at idle and take off. runs fine when up to speed


Perform a compression test, if okay, look at plugs and ignition items, then look for intake leaks.

I suspect that you just may not feel the misfire at speed.

Intake based leaks do manifest as per your description, but usually missing is just less noticable at higher engine speeds.

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