Question about 2003 Ford Focus

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Car only running on 2 cylinders

Started having this problem just the other day. where the car seemed to be missing or loosing a cylinder, but it was intermittent. now car will not idle even to 1000rpm. so i have changed spark plugs and removed leads while running the vechile i found that cylinder 2 and 4 are not even running. Any help as to what to check next, leads are in good condition...thinking fuel pump or injector problem possibly???

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  • clever_2310 Jul 29, 2009

    thanks for the replys. last night i pulled all the spark plugs out and turned the motor over with the plugs touching earth to see if they were all sparking. cylinder 2 and 4 were barely sparking at all. Now if i had a coil pack problem wouldnt this prevent any of the cylinders firing? as there is only one coil for all four leads. just want to check before i buy a new coil pack. thanks

  • clever_2310 Jul 29, 2009

    thanks for the replys. last night i pulled the spark plugs out and tested to see if i got a spark on all 4 cylinders. again 2 and 4 were not sparking. now if i had a coil pack problem wouldnt this mean there would be no spark on any of the plugs because the one coil supplies all plugs? just want to check before i buy a new coil pack. thanks

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Cyl 2 and 4 are probably run off the same ignition coil. I would start by checking for spart on those cylinders.

It is not likely a fuel problem if it is only effecting 2 cylinders.

Posted on Jul 27, 2009

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Sounds like a bad coil pack, see if you can borrow or puchase a used 1 to test for the problem.If the problem is corrected you can either keep the used 1 or buy new. Hope this helps.

Posted on Jul 27, 2009

  • Doug Windsor Jul 29, 2009

    With DIS ignition systems there is always 2 cylinders firing at the same time 1 fires a positive spark ( to ignite ) the other fires a ground. So in other words cylinders 1 & 3 fire together and 2 & 4 fire together. I suggest a new or used coil.

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