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Thread: segment swap in COS5

  1. #11
    Joe (Moderator) joecar's Avatar
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    I'm trying to see if you can get the gauge to move at all.

  2. #12
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    So far, nothing has affected it, stays pegged. Ended up running it way too low today not paying attention and almost ended up on the side of the road. Added 15.7 gallons, oops!
    '98 Z28 S475

  3. #13
    Joe (Moderator) joecar's Avatar
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    Try doing the full flash again.

  4. #14
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    Did a full flash, still nada
    '98 Z28 S475

  5. #15
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by B18B1LS1 View Post
    ...
    Do I have to revert back to my original GM OS then segment swap, and then start over on my COS5?
    ...
    You shouldn't have to, but go ahead and try that ^

  6. #16
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    Would I just full flash right back to the stock 02 OS, then swap in the fuel segment and do a calibration flash and see if it works? If it does then start copying over all my current tune tables?
    And if it doesn't work and I want to get back to where I'm at now so the car is at least driveable, I can just full flash my current COS5 tune right back in no problem?
    '98 Z28 S475

  7. #17
    Joe (Moderator) joecar's Avatar
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    Save your current COS5 tune.

    Then full flash to the GM tune, do the fuel segment swap, do a full flash, and see if gauge works.

    If it does, do the empty COS5 full flash, read it back (do the sanity edits) and save as new file, see if gauge works.

    ~ posted by phone ~

  8. #18
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    Ok, just wanted to make sure! Thanks Joecar
    '98 Z28 S475

  9. #19
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    Still didn't help unfortunately. I'm not sure how I made something so simple, so complicated! I'm wondering if the sender crapped out or the wiring is jacked up somehow
    '98 Z28 S475

  10. #20
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    If I'm reading the electrical diagram correctly, I should be sending 5v down the purple wire to feed my sender, my multimeter is showing only 1.2v, hmmm. Does this fuel segment stuff affect the voltage being sent to the sender in any way?
    '98 Z28 S475

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