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Mk4 Lumpy Under Acceleration

A2D2
A2D2
in Ford Fiesta Club

Featured Replies

Hey you lot, I'm new to the forums, hopefully I can provide info as well as deal out the problems :)

I purchased a '99 Mk4 Fiesta about 8 months ago and gradually the lower end of the gears, when I need to accelerate mid to hard it feels as if the engine momentarilly cuts out for a few seconds then around the torque band it sorts itself out.

replaced the spark plugs a month or two ago and the problem ironed itself out for a while, but it has returned again! I bought some Redex for injected engines thinking its maybe a problem with the injector bank?

Question is, is it my driving style? Or am I missing something important?

Any questions just fire away.

Thanks in advance, will probably edit to add things I've forgot!

  • Quote


    have you checked out the HT leads?

  • Quote
    • Author

    HT leads arent bad, could be an idea to replace them and see if it clears up.

  • Quote

    thinking about it if one went then it would be rough as you would have a cylinder down... so try the distributor cap, rotar arm inside.

    I am taking a guess though.

    Also check the lead from the coil to the distributor.

  • Quote
    • Author

    Thanks for the info will 'ave a look this weekend!

  • Quote
    thinking about it if one went then it would be rough as you would have a cylinder down... so try the distributor cap, rotar arm inside.

    I am taking a guess though.

    Also check the lead from the coil to the distributor.

    If its a zetec it will have a coil pack not distributor.

  • Quote
    • Author

    Report: Had a quick once over of the car with my car and all was fine until we started the car up. Dad was under de bonnet and said when a gave it some throttle there was a sort of swooshin, air escaping from a pipe noise. He thinks that might be the porblem for the lack of power under acceleration.

    Needs looked at!

  • Quote

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

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      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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