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Thread: 08 Buell-does tach sweep while driving...

  1. #11
    Senior Member Cooter's Avatar
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    Hello? Is this thing on? A loose O2 sensor would not make the tach sweep or cause the bike to shut off.

    But any of these things would:

    Quote Originally Posted by Cooter View Post
    Check for corrosion in your ignition fuse/relay circuit in the fuse box (all the relays are the same so swapping them around is OK), including the red run switch.

    Check all grounds near the steering neck, a known problem with Buells.
    Are your battery terminals tight? Take them off and check for corrosion there too.

  2. #12
    Senior Member rchuff's Avatar
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    Check around your steering neck for broke wires or wiggle the wires at steering neck with bike running and see what happens.
    Last edited by rchuff; 05-27-2020 at 01:15 AM.

  3. #13
    Member Barrett's Avatar
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    Quote Originally Posted by dodge View Post
    And sometimes just dies. No fault codes. Seems to be happening more frequently...any ideas what might be going on? Is this symptomatic of something going bad perhaps?

    thanks!
    Sir: this is the result of two possible culprits. ONE: frayed or completely torn and arcing main power feed to the frontal components, one of which is the instrument cluster. TWO: design flaw from the factory in the wiring harness for the ignition switch. you will need to split the main wiring harness in vicinity of the steering neck, identify the main power RED WIRE and trace it for crack/partial tear/break. lengthen the factory ignition switch wiring harness. it is approx. 15mm too short as installed. the result? a turn of the "handlebars" to either left or right full lock puts undue-stress on the harness-to-switch assembly connection causing intermittent loss of power to the switch assembly. your gauges then SWEEP because they are losing power. both of these problems were factory design faults not addressed till major 2008 upgrades appeared.

  4. #14
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    I had the same thing > After the bike was hot, the tach would sweep and jump during riding. My bike would also turn off randomly.
    I would wiggly the left harness to get the bike started again -

    CAUSE- The ECM/Computer solder joints were cracked/broken - Very common on these Buells -I soldered mine been running like new!
    SOLUTION- (1) New ECM (2) Carefully use a hacksaw and open the computer to solder joints(google) (3) message me and I can help you out

    Took Me forever to figure this out. Thought is was a frayed wire, went as far as soldering new wiring into the ECM Plug

  5. #15
    Junior Member
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    I had the same thing, got worse with time > no codes > After the bike was hot, the tach would sweep and jump during riding. My bike would also turn off randomly.
    I would wiggly the left harness to get the bike started again -

    CAUSE- The ECM/Computer solder joints were cracked/broken - Very common on these Buells -I soldered mine been running like new!
    SOLUTION- (1) New ECM (2) Carefully use a hacksaw and open the computer to solder joints(google) (3) message me and I can help you out

    Took Me forever to figure this out. Thought is was a frayed wire, went as far as soldering new wiring into the ECM Plug

  6. #16
    Senior Member Endopotential's Avatar
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    Matty, any pics or details about exact what part of the ECM needed to be re-soldered?

  7. #17
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    https://www.ebay.com/itm/BUELL-ECM-COMPUTER-REPAIR-REPAIR-SERVICE-XB-XB9s-XB12s-FireBolt-Ulysses/233597484604?hash=item36637ebe3c:gMoAAOSwHDVeybh0

    Second photo will show you what side to cut into> Make sure you go slowly when cutting into the sides so you don't cut into the motherboard> the top part you can use a razor blade to cut the seal(again do not go too deep). Add new solder to all pin joints, make sure to heat the old joints well, then add the new solder. Can uses Kwik Seal to seal the ECM
    835455.jpg


    Last edited by mattyMaxMac; 06-04-2020 at 04:28 AM.

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