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Thread: Backfire rumble when slowing down

  1. 2nd May 2010, 12:13 PM #1
    mikesolo
    mikesolo is offline Master
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    Backfire rumble when slowing down

    Hi All

    Just running in a rebuilt 2.25l petrol motor. I have noticed a very slight rumble or backfire when slowing down. eg. at traffic lights.
    Is this normal or something to be concerned about. I have set the timing and spark as per the land rover service manual, also fitted a new distributor.
    Motor starts, runs and idles well, buts rumbles when slowing down.

    Needing help.
    Mike
    Last edited by mikesolo; 2nd May 2010 at 09:20 PM. Reason: spell check
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  2. 2nd May 2010, 02:00 PM #2
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    series3
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    Hi Mike,

    I have a fresh (~7000km) 2.25 as well in a SWB 2a. I have noticed mine doing this as well, It's a bit of a cackle from the exhaust when under compression braking. Is this the same as yours?

    AFAIK there is nothing wrong with it, personally I love the sound and regularly hang my head out the window to hear it!

    Sam
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  3. 2nd May 2010, 06:10 PM #3
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    UncleHo
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    G'day Folks

    Nothing wrong with it just a nice healthy motor that is running nice and lean which means the carby is OK

    Sounds even better with a 2" (50mm) system and a 12inch freeflow muffler,bellows like a bull on a long uphill pull

    cheers
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  4. 26th May 2010, 04:23 PM #4
    jonathan108 Guest
    Mine did this until I had some holes in the exhaust welded up. probably still does it but i can't hear it now.
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