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A.I.R elimination...

Discussion in 'The Garage' started by 79k20350, Nov 18, 2006.

  1. 79k20350

    79k20350 3/4 ton status

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    Ok guy, i got an 87 v10. It had AIR but it wasnt hooked up to the exhaust. i pulled it all off. Without everything hooked up its running a little rougher. Does the computer need to be reprogramed? Also for exhaust plugs, i just cut the lines short and hammered them flat. It works for now but i need something better. The fittings appear to be 5/8" double flair, can i get a plug for this? Thanks guys!:D
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I can't say for certain, but I would think that eliminating the AIR pump *might* confuse your computer. After all, in theory, your exhaust now has less oxygen content, and your O2 sensor may be picking that up and sending an innacurate reading back to the computer.

    I'd love to pull all the emission crap off of my 89 V3500, and would be curious to hear some educated opinions on this. I'd hate to eliminate it all, only to realize that it is needed to keep the motor running right.:doah:
     
  3. 79k20350

    79k20350 3/4 ton status

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    Im sure that even with pulling it all thats needed is a computer tune at the max... Also if im not mistaken doesnt it inject air after the o2? idk know much about the air system:crazy:

    My biggest concern right now is how to make a plug so i dont have to buy new manifolds. What i have works but its not that great...
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Nope, the AIR injects into the exhaust manifold BEFORE the O2 sensor.

    When I eliminated the AIR from my 84 K5, all I did was install 1/4" threaded plugs in place of the AIR lines. I'm not sure if the AIR ports on your 87 are a different sice, though......
     
  5. JEBSR

    JEBSR 1/2 ton status

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    I pulled the entire system off of my 87 v10 and put long tube headers on and plugged the vacume line at the pump/diverter valve. I have had no troubles after doing this.
     
  6. 79k20350

    79k20350 3/4 ton status

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    Hmmm. the way mine is, the manifolds have holes for 5/8" double flair fittings:confused:
     
  7. sandawgk5

    sandawgk5 3/4 ton status

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    Yep that is right in 87 there was 1 large fitting for each header. Some of the older ones had a 1/4" fitting on each primary.
    [​IMG]
    [​IMG]

    Ira
     
  8. 79k20350

    79k20350 3/4 ton status

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    Thanks for the pics Ira. so do they make such plugs or would it be easier to just tap the hole to an npt size and run a npt plug
     
  9. sandawgk5

    sandawgk5 3/4 ton status

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    That I dont know living in Cali I have to keep mine. I personally dont feel that the emissions really do that much to hinder performance.

    Ira
     
  10. 79k20350

    79k20350 3/4 ton status

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    For the most part emissons dont hinder performance... with this being a belt driven system there is some parasitic lose... that and the system wasnt working properly anyways so dumping it was really the only option.
     
  11. JpEater

    JpEater 1/2 ton status

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    Just cut the metal pipe, pinch it flat, and then fold it over to seal it off. I have done this several times with no problems.
     
  12. 79k20350

    79k20350 3/4 ton status

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    Thats what i did, i would like something nicer though
     
  13. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    If you have to have them off , remove them , grind the tube flat to the fitting , and fill the center with weld , instant plugs .
     
  14. 79k20350

    79k20350 3/4 ton status

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    Thats a good idea paul...itll take a little bit of wire do it, but good idea:D
     
  15. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Im thinking that you rough running problem is probably because the manifolds are leaking a little where the air plugs were. Pulling the air crap doesnt hurt these tbi trucks. I have an 87 as well and pulled all my air crap off. I did it to make it easier to work on, and to get rid of some weight. I took off the air pump, and air lines and all was ok. I do get a check engine light (but that is for 02 sensor because I put on headers and im running no exhaust, just open headers, so my 02 sensor is now at the end of my short exhaust and sucking up outside air). That wasnt caused by unhooking the air stuff.

    FYI: The air system is an emissions system that attempts to take warm air from the exhaust manifolds and pump it back into the engine to reduce emissions when the vehicle is cold.
    -Harrison
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    AIR deals with byproducts in the exhaust manifolds/cat converter (depending on application), THERMAC is the warm air deal you are thinking of. :)
     

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