Fat ECU -> Yosh box service - Page 2
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Thread: Fat ECU -> Yosh box service

  1. #11
    Baby Twin
    Join Date
    Aug 2009
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    St. Paul MN
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    57
    The blue wire should go to ground in neutral not to the pink wire.

  2. #12
    GP Champ rxf610's Avatar
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    Oct 2013
    Location
    Georgia, US
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    1,746
    Few things...

    I highly doubt it is the ECU. HIGHLY DOUBT.

    Go through and look at all connection points on vacuum. These hoses get cracked and are old. Snip like 1mm off anything suspect. Also snip like 1mm of the HT lead at the plug. Could be a bad connection.

    Brainless on the planet has a Yosh box rip off, but I have used it and it works...

    I have a 97S too...

    I went -5,+5,+5 and 11'oclock.

    Runs like a champ.
    ... listen to Six5 ...

  3. #13
    One Liter Duc Eater muguvian's Avatar
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    Nov 2010
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    Eastern North Carolina
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    724
    TunaGlove, you're right I misread the manual. I'll go back into the GPS.
    rxf610 - vacuum lines will be re-re-checked, may just replace. I started there but I'll do it again.
    With a full exhaust, +4mm overbore, and right about 13:1 CR I was running the same map settings as you and could float the tire in third. After riding it for 18 years I still love this engine.

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  5. #14
    Baby Twin
    Join Date
    Aug 2009
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    St. Paul MN
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    Ok now going back to the low supply voltage on the iat sensor, try measuring it with the side stand up and down.

  6. #15
    One Liter Duc Eater muguvian's Avatar
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    No change on the IAT voltage with the kickstand either up or down, but the interlock functions clearly work. The diode test shows around .61V up and open when down and the fuel pump cuts off as it should. I've ordered another kickstand switch just to have a spare to test. Vacuum lines and connections all good, btw.
    I believe the coolant temp is the major contributor to the fuel map and the IAT is a trim for the ECU, and my coolant holds rock solid at 190F when I'm getting the overly rich running. I'll throw in some new plugs and redo the TB sync/TPS just for fun.

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