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Mk1 Petrol Not Running Right

ralphrj
ralphrj
in Ford Focus Club

Featured Replies

I am trying to solve a problem with my Mk1 1.6 petrol Focus.

The engine is not running smoothly and feels down on power.

I know that it is not the coil pack as this failed and was replaced a few months back and the current problem is nowhere near as severe but still annoying.

If I disconnect the battery to reset the ECU the problem disappears for approximately 20-30 minutes before coming back. There are no warning lights illuminated on the dashboard.

I suspect it could be a faulty sensor that is giving an incorrect reading as the ECU "learns" resulting in an incorrect fuel/air mixture.

Any suggestions?

  • Quote


    I am trying to solve a problem with my Mk1 1.6 petrol Focus.

    The engine is not running smoothly and feels down on power.

    I know that it is not the coil pack as this failed and was replaced a few months back and the current problem is nowhere near as severe but still annoying.

    If I disconnect the battery to reset the ECU the problem disappears for approximately 20-30 minutes before coming back. There are no warning lights illuminated on the dashboard.

    I suspect it could be a faulty sensor that is giving an incorrect reading as the ECU "learns" resulting in an incorrect fuel/air mixture.

    Any suggestions?

    with these issues its best to take it to a garage who can read the live readings on a diagnostic so they can pinpoint the issue really it can be a split in a hose causing an air leak it cam be that the coil was replaced but the misfiring has damaged the cat a fauklty lead choked fuel filter to name a few it could be the exhaust o2 sensors really a diagnostic will save you money in the long run that way you only replace what is found to be faulty and not half a dozen parts in the hope one of them fixes it

  • Quote

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    The "Digestive"

    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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