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Thread: Sudden severe overfueling with my Sniper EFI.

  1. #21

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    Quote Originally Posted by 2B32 View Post
    Was this a definite fix for you? My truck did the same thing today, but even reflashing and disabling Closed Loop would not let me drive home.
    I know this thread is dead, but I'm guessing I just had the same problem. I'm ignorant on all this stuff, I've never had anything but mechanical fuel pumps & carbs. I had a shop install the Sniper and everything has been really good. I have about 1500 miles on it with no problems. Parked the truck, went back out today to start it and will barely start & runs rough. When it does start, AFR is pegged at 35:6 and does not move.
    1982 K10, 383 stroker, Holley Sniper EFI, 700R4, 2˝" Skyjacker suspension lift.

  2. #22
    Join Date
    Oct 2016
    Location
    Middle River, MD
    Posts
    249

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    Sure sounds like yours died too. I've never had an WBO2 sensor just die like the original ones have done. Holley Tech will send you one under warranty, or if it's a daily driver, an Amazon.com or local auto parts store for a Bosch 17025.

  3. #23

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    It is my daily driver. I have Amazon prime and O'Reillys didn't have it in stock, so I can get it more quickly from Amazon. If I'm understanding everything correctly, I need to clear everything out of the units memory, install the Bosch sensor, then start over with the base calibration and let it relearn? And of course, save a tune to the SD card this time. Is all that correct?
    1982 K10, 383 stroker, Holley Sniper EFI, 700R4, 2˝" Skyjacker suspension lift.

  4. #24
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,649

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    https://forums.holley.com/showthread...7878#post87878 (Additional Config File & 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

  5. #25
    Join Date
    Oct 2016
    Location
    Middle River, MD
    Posts
    249

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    Quote Originally Posted by Splandman View Post
    It is my daily driver. I have Amazon prime and O'Reillys didn't have it in stock, so I can get it more quickly from Amazon. If I'm understanding everything correctly, I need to clear everything out of the units memory, install the Bosch sensor, then start over with the base calibration and let it relearn? And of course, save a tune to the SD card this time. Is all that correct?
    Correct. Follow Danny's link and once all is running good again, and you've let it relearn adequately, save that tune, so if it happens again, you have a good starting point.

  6. #26
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,649

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    But for now (until the replacement WBO2 sensor arrives), you should be able to run the engine in Open Loop mode, if the Base Fuel Table is well tuned.
    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

  7. #27

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    Thanks for this thread, and for the help to both of you. I will get the WBO2 sensor ordered today.
    1982 K10, 383 stroker, Holley Sniper EFI, 700R4, 2˝" Skyjacker suspension lift.

  8. #28
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,649

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    You're welcome.
    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

  9. #29

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    Quote Originally Posted by Danny Cabral View Post
    But for now (until the replacement WBO2 sensor arrives), you should be able to run the engine in Open Loop mode, if the Base Fuel Table is well tuned.
    http://forums.holley.com/showthread....ension-Harness (WBO2 Sensor Information - Read 4th & 5th paragraph under "Wideband O2 Sensor Notes".)
    Went out and put it in open loop and it ran pretty strong. Definitely good enough to drive until the sensor arrives. Interestingly, the last time I drove the truck (Friday), I was experiencing a shudder in the truck when it shifted in to 3rd & 4th. I assumed this had something to do with my lockup converter because I have had a lot of issues with the 700R4. When I just test drove the truck, there was none of that. It ran strong & shifted fine, no shudder.
    1982 K10, 383 stroker, Holley Sniper EFI, 700R4, 2˝" Skyjacker suspension lift.

  10. #30

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    Since you mentioned the 700R4 transmission, the Holley bracket that came with the Sniper didn't even come close to working for my 700R4.
    I had to cut and marry it to another brand bracket to get it dialed it. Did you have better luck with the included brackets or did you have to modify also?

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