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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
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    26,733

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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.
    '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.

  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
    26,733

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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.
    '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.

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