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Thread: Car missing a beat when driving slowly

  1. #1
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    Car missing a beat when driving slowly

    Noticed while driving south yesterday that be car seemed to missing a beat/hunting when trying to poodle at under 50. No problem under acceleration or when cruising around the 70 mark. Is it worth putting Redex or similar in?
    2004 3.0 se

  2. #2
    Senior Member Jim_S-V6_2004's Avatar
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    May be an air leak though Jim.

    Put your ELM327 on it and look at the fuel trims. If they are around 0 then they are ok, i.e. no leak.

    I'm trying to find some RedEx here in Cyprus for our newly acquired C180, it's got a lumpy idle as usual with almost every used car we bought.

    .

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    Where and what are the fuel trims and how do I find this on the ELM 327. There are no fault codes coming up
    2004 3.0 se

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    Quote Originally Posted by Jim Greenfield View Post
    Where and what are the fuel trims and how do I find this on the ELM 327. There are no fault codes coming up
    This will explain what you have to do.



    Which app/program are you using?

  5. #5
    Senior Member Neilr's Avatar
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    A dying coil pack could exhibit such symptoms too and they often don't throw a code

    Quite commonly, the wiper drains get blocked and rainwater overflows, finds its way into the area of the rear-most coils and they start to deteriorate. Something to keep in mind and note replacing one bank on the V6s is a longer job. If it turns out to be a coil, I would replace the all three and the plugs on that side, if they haven't been done in a while.
    S-Type 3.0 Manual MY2001 in Pacific Blue with Cashmere Leather Sport Seats, Sunroof, Melbourne Alloys, Premium Sound plus some other stuff ... 55k miles.
    XKR 5.0 Speed Pack MY2011 in Polaris White with Ivory/Charcoal Leather, Nevis Alloys and R-Performance Interior plus some other stuff ... 17k miles.
    Hyundai Tucson 1.6T AWD MY2016 in White Sand. Basic, comfortable and surprisingly fast and competent ... 12k miles.
    FIAT Coupe MY1997 in Steel Grey with Tan Leather ... 55k miles.

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    Thanks for the info and I have watched the video but fuel trims are obviously way over my head. All I have is the little ELM unit working through the app on my phone. As I say, no fault codes have come up. Just bought some Millars petrol additive and will put that in tomorrow to see if it makes any difference
    2004 3.0 se

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    What app do you have

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    Have a look at ltft (long term fuel trim) on both banks.

  9. #9
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    Quote Originally Posted by Jim Greenfield View Post
    Just bought some Millars petrol additive and will put that in tomorrow to see if it makes any difference
    Jaguar say not to use any such things.

    Better to put the effort into fuel trims.

  10. #10
    Senior Member Marcuspd's Avatar
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    My 3.0 was missing when i bought it. You could feel it at idle and the needle blipped every so often at Rickover.

    It eventually pulled an EML light and was down to coil pack 1. Very cheap and easy fix. Has ran like a dream since.
    Jaguar S Type 3.0 V6 Sport 2001.

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