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Thread: Learn Table Issues

  1. #1

    Default Learn Table Issues

    Hey All. I'm still fairly new to Holley EFI and have an issue I wasn't able to figure out before winter.

    Learn Table is showing pretty rich in a few areas (see tune), but when I Transfer Learning To Base and I drove it after, it went lean in the same area.

    I put the Base Fuel Table back to were it was, drive it and runs great, but the learn shows rich again. What am I missing?
    learn table issues.zip

  2. #2

    Default

    What does the downpipe look like? Is it short? What fuel is being used? Andrew

  3. #3

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    It's 3" and goes all the way to the back of the truck. It's done this to me with 91 octane pump gasoline, and with a blend of VP 116 race gasoline/91 octane.

  4. #4

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    @jfehr: Is the VP 116 leaded? If so, the Bosch WBO2 sensor won't tolerate that very long.

  5. #5

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    Yeah, it's leaded. It was just for a trial for a weekend of test & tune. I've pulled some timing out of it and he runs it on 91 pump on the street.

    I'm just very confused why it goes dead lean after I Transfer Learning To Base.

    It's winter up here so unfortunately I won't be able to play with it more until spring time, but wanted to get some ideas what to look for.

  6. #6

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    You most likely killed the WBO2 sensor. They tend to fail into a false lean condition.

  7. #7

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    This issue did start before we added the leaded fuel, would the WBO2 sensor reading still show steady, but give an incorrect reading at a certain load/RPM range?

  8. #8

    Default

    Hard to say. You may have been having other issues.

  9. #9
    Join Date
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    Location
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    Default

    Replace the WBO2 sensor, ensure there's no leaks upstream of the WBO2 sensor, and check fuel pressure.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  10. #10

    Default

    Yeah, I'll do that. I did check fuel pressure, and it's good. Thanks guys.

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