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Y pipe problem

This is a discussion on Y pipe problem within the General Help forums, part of the LSx Technical Help Section category; hey guys, I recently bought an LPP Y and Headers, and I noticed the Y pipe has fittings for O2 ...

  1. #1
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    Y pipe problem

    hey guys, I recently bought an LPP Y and Headers, and I noticed the Y pipe has fittings for O2 sensors for the rears, should I plug a sensor and leave it un connected I really dont want to buy extensions for the rears.

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    Veteran 0rion's Avatar
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    yeah, just use an O2 or you can buy plugs for those. I know Jeg's carries them and I would imagine summit does too. Heck, check the local parts stores. Might find them there. I forget the thread size....I'll have to look that up but if you have a good hardware store you could just buy a bolt and cut it off.
    If you use a sensor I would just cut the harness completely off.

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    Member DaddySS's Avatar
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    You will need to buy 02 simulators, buy the extensions (if you have cats), or get it tuned out.

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    Moderator Firebirdjones's Avatar
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    I believe the thread size is 18mm. If I'm not mistaken,,,it's the same as the 02 bungs I weld in the exhaust for the wideband.

    In which case, you can also plug it on the cheap side. It's the same thread as the old 13/16 spark plugs (big plug) used from 1970 and prior. If you have any of those laying around they screw right in.

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    Thank you guys, Looks like I'll be taking Orion's advice to just use the old O2's and cut the wires off.

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    Moderator Firebirdjones's Avatar
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    If those 02's are still operational I don't think I would go hacking on them, there are a bit on the expensive side. I'd save them for another day.

    It would be much cheaper to run to the parts store and just pickup a couple of 13/16 spark plugs for about $2.

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    get them tuned out... they are worthless IMO... save the 02 sensors incase your front ones take a crap on you...

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    Quote Originally Posted by Firebirdjones View Post
    If those 02's are still operational I don't think I would go hacking on them, there are a bit on the expensive side. I'd save them for another day.

    It would be much cheaper to run to the parts store and just pickup a couple of 13/16 spark plugs for about $2.
    that's a good point actually. I was thinking that if he just plugs the holes with sensors and they're not plugged in it'll kill the sensors anyhow so he might as well cut the leads off. Your idea is much better. Never hurts to have that extra set of sensors laying around in case you need them.
    I was thinking the thread was 18mm I just can't remember the pitch.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by 0rion View Post
    that's a good point actually. I was thinking that if he just plugs the holes with sensors and they're not plugged in it'll kill the sensors anyhow so he might as well cut the leads off. Your idea is much better. Never hurts to have that extra set of sensors laying around in case you need them.
    I was thinking the thread was 18mm I just can't remember the pitch.
    Shucks I don't know the thread pitch either, I just remember 18mm. That's why I've used old 13/16 spark plugs before. Sounds hokey but it works great.
    I've even busted the porcelein (sp) off and just welded up the end,,,looks pretty much like a bolt at that point

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    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    If those 02's are still operational I don't think I would go hacking on them, there are a bit on the expensive side. I'd save them for another day.

    It would be much cheaper to run to the parts store and just pickup a couple of 13/16 spark plugs for about $2.
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    good point Firebirdjones, I dont know why the bungs are there, its supposed to be an ORY, but Ohh well. Thank you

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    Moderator Firebirdjones's Avatar
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    If it helps the part numbers for the 1970 and prior "big" plugs would be some of these....

    R43
    R44
    R45

    These are AC numbers,,,and you can also get these with the letter "S" at the end of the part number. That would be the same plug but with an extended tip.

    Anything with a "T" in the part number is the smaller plug (stands for tapered seat) for example R44T or R44TS. Hope that helps.

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    You can get caps for 02 bungs cheap but remember as I said above, if you don't get them tuned out, you will get an ses light.

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    Quote Originally Posted by DaddySS View Post
    You can get caps for 02 bungs cheap but remember as I said above, if you don't get them tuned out, you will get an ses light.
    he has hptuners.....I saw a post of his in another thread.

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    Well that should take care of that!

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    thank you for the help guys, I am awaiting fair weather, and for my plugs, wires, and gaskets to get here, I am so eager I will start removing AIR and EGR on friday.

    One last question for you guys who are running Widebands, could I use these holes for a wideband?

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    Quote Originally Posted by SVG210 View Post
    thank you for the help guys, I am awaiting fair weather, and for my plugs, wires, and gaskets to get here, I am so eager I will start removing AIR and EGR on friday.

    One last question for you guys who are running Widebands, could I use these holes for a wideband?
    yes but you'll only need 1 of them for the wideband

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    thank you

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