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Thread: Runs better with WBO2 sensor unplugged.

  1. #1

    Default Runs better with WBO2 sensor unplugged.

    Wondering if anybody has encountered similar situation. When WBO2 sensor is plugged in AFR shows 34-35 on handheld, but is actually flooding. When unplugged and in Closed Loop, engine runs as it should, meaning smooth idle and expected throttle response.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,643

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    You have a failed WBO2 sensor. Yes, it must be a Holley/Bosch 554-101 WBO2 sensor.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

    Default

    Thanks for the response. I'm using the small handheld controller. I've read that should the WBO2 sensor be installed on long run headers, that there was a way to tell the system to only run in Closed Loop after a certain RPM range. If that is correct, I can not find that info. Is that available?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,643

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    Read 2nd paragraph under "Wideband O2 Sensor Notes": https://forums.holley.com/showthread...ension-Harness (WBO2 Sensor Information)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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