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Thread: I don't like my WBO2 sensor bung install.

  1. #1
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    Default I don't like my WBO2 sensor bung install.

    I really hate my WBO2 sensor bung weld job I did. The welds came out terrible and I'm concerned with bung leaks. Although when I've hated weld jobs I've done in the past, they have worked fine. For example, when I made my fuel filler neck, I hated the welds, but it doesn't leak. Or when I replaced my floor pan I hated it and did it again, only to find out I did a good job.

    I'm thinking of four choices in no order.
    1. Cut off the bung and do it again.
    2. Keep it as is and drive the car to a exhaust shop and have them weld a new one or or add more weld to my job.
    3. Keep welding around the bung.
    4. Cut off my O2 bung and use the clamp on O2, then drive to a exhaust shop, or not have it welded and just run the clamp on.
    Any suggestions or opinions would are welcome, as I don't know what to do.
    Last edited by RPnova; 01-26-2018 at 12:21 AM.

  2. #2
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    If you're removing the exhaust pipe from the vehicle, and you're sure you can do a better job, I agree on redoing it.
    I say this because if you suspect an AFR problem, you'll wish you had, since you'll immediately think it's the WBO2 bung.
    https://forums.holley.com/showthread...4322#post14322 (Additional WBO2 Bung 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

  3. #3
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    I'm welding the header with it in the car. It's very tough, and not a lot of room, and a real pain to take off the passenger side header off.

  4. #4
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    Quote Originally Posted by Danny Cabral View Post
    If you're removing the exhaust pipe from the vehicle, and you're sure you can do a better job, I agree on redoing it.
    https://forums.holley.com/showthread...4322#post14322 (Additional WBO2 Bung Information)
    I say this because if you suspect an AFR problem, you'll wish you had, since you'll immediately think it's a WBO2 bung leak. You may want to try the clamp on WBO2 sensor bungs (LINK).
    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. #5
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    I completely agree with you. It will be the 1st thing I think of.

    I have a clamp-on already. Whatever I bought came with it. I actually mocked up the clamp-on, but the clamps were too small, as there for 2.5" inch tube and I have 3" exhaust & header collectors. My next question is the only difference in the clamp-on kits, is the size of the clamps and not the clamp-on bung? Because then I could just buy clamps and not the whole kit again.
    2.5" https://www.holley.com/products/exha.../71014302-RHKR
    3.0" https://www.holley.com/products/exha.../71014301-RHKR

  6. #6
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    Quote Originally Posted by RPnova View Post
    My next question is the only difference in the clamp-on kits, is the size of the clamps and not the clamp-on bung?
    Yes, the WBO2 sensor bung is always the same 18 mm x 1.5 pitch metric thread.
    If you have access to a smoke machine (LINK), you could test the integrity of your weld.
    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. #7
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    What I'm referring to is not the thread pitch, but rather shape of the bung. Since 2.5" inches is smaller than 3", would the shape be different, or the saddle shape be different between the two? If that makes any sense. I'm guessing they're identical. I don't have a smoke machine, although I did spray water around the welds a day after I welded, and couldn't feel any moisture inside.

  8. #8
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    Quote Originally Posted by RPnova View Post
    What I'm referring to is not the thread pitch, but rather shape of the bung.
    Yes, I realize that.

    Since 2.5" inches is smaller than 3", would the shape be different, or the saddle shape be different between the two? If that makes any sense.
    Yes, the curved shaped saddle that's positioned on the exhaust pipe O.D. is the only difference.

    I'm guessing they're identical.
    No, the curve is different according to your exhaust pipe diameter. That's why there's three different sizes:
    https://www.holley.com/products/exha.../71014303-RHKR (Hooker BlackHeart 2¼" Clamp-On WBO2 Bung)
    https://www.holley.com/products/exha.../71014302-RHKR (Hooker BlackHeart 2½" Clamp-On WBO2 Bung)
    https://www.holley.com/products/exha.../71014301-RHKR (Hooker BlackHeart 3" Clamp-On WBO2 Bung)
    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. #9
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    I called Holley to see if there's a difference in the curve, and you're right Danny, there is a difference in the curve for each pipe. Not that I doubted you, but I wanted to see if they would send me a 3" for free, and they wouldn't do it.

    But what he said is; if the car is running bad or AFR is out of whack or a noticeable leak, I could use the handheld and put the car in closed loop, which would allow me to drive the car to the exhaust shop. Essentially driving on the initial startup tune as if the car was cold. Pretty interesting and very cool I thought.

  10. #10
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    Quote Originally Posted by RPnova View Post
    But what he said is; if the car is running bad or AFR is out of whack or a noticeable leak, I could use the handheld and put the car in closed loop, which would allow me to drive the car to the exhaust shop.
    You mean set the ECU to "Open Loop", not Closed Loop. Open Loop ignores the WBO2 sensor reading (& disables Learning), and runs the engine off the Base Fuel Table.
    Read the 4th paragraph under "Wideband O2 Sensor Notes": http://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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