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Thread: Sudden severe overfueling with my Sniper EFI.

  1. #41

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    Hi all. I've had a very similar situation, but was driving at 80 MPH and it started to over fuel & flood. I managed to get it home after cutting out three times. After reading this thread, I disabled Closed Loop and reloaded a new base calibration, the car fired up and was able to drive it around. I turned the Closed Loop on, and almost instantly started to over fuel until I disabled it. Mine is in a '76 Corvette with a 383 mild cam & sidepipes, so the closest place I could put the sensor is 3-4 feet away from the head.

  2. #42
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    Dec 2009
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    Connecticut
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    Quote Originally Posted by fissan View Post
    I turned the Closed Loop on, and almost instantly started to over fuel until I disabled it.
    So check for wiring problems and replace the WBO2 sensor. Also, ensure there's no exhaust leaks upstream of the WBO2 sensor.

    Mine is in a '76 Corvette with a 383 mild cam & sidepipes, so the closest place I could put the sensor is 3-4 feet away from the head.
    That should be fine. A short lived WBO2 sensor is usually an installation or location problem.
    http://forums.holley.com/showthread....ension-Harness (WBO2 Sensor Information - Read 4th & 5th paragraph under "Wideband O2 Sensor Notes".)
    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. #43

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    Cheers Danny. No leaks upstream. Only way to relocate closer to heads would be to install a bung in a single runner, but this would only sample one cylinder. Just need now to order a replacement sensor. Regards, Bruce.

  4. #44
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    Quote Originally Posted by fissan View Post
    Only way to relocate closer to heads would be to install a bung in a single runner, but this would only sample one cylinder.
    I didn't say it needed to be located closer. Three or four feet from the cylinder head should be fine.

    Just need now to order a replacement sensor.
    Click on the link in my post #42 above.
    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

  5. #45

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    There's a good bit of info there Danny. Was I interpreting something correct, that I can space the sensor out of the exhaust gas stream? If this is so, it may be my best option as the prewelded bung in my collector is at 90° from vertical, and can't be repositioned due to bodywork. (Hooker header Corvette sidepipes setup.) Will these operate out of the exhaust flow? Regards, Bruce.

  6. #46
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    Dec 2009
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    Connecticut
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    Quote Originally Posted by fissan View Post
    Was I interpreting something correct, that I can space the sensor out of the exhaust gas stream? Will these operate out of the exhaust flow?
    Yes, within reason. That's the purpose of the HBX-1 and/or long WBO2 sensor bungs.
    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

  7. #47

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    OK. I'll look into reinstalling a bung that protects the sensor and angles it as much as I can, with the room I have. Regards, Bruce.

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