A.I.R elimination...

[79k20350]

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!

 

[Can Can]

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.

 

[79k20350]

I can't say for certain, but I would think that eliminating the AIR pump *might* confuse your computer. After all, your exhaust has less "clean" air being delivered through it, 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.

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

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...

 

[Can Can]

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......

 

[JEBSR]

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.

 

[79k20350]

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......

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

 

[sandawgk5]

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

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.

Ira

 

[79k20350]

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.

Ira

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

 

[sandawgk5]

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

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

 

[79k20350]

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

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.

 

[JpEater]

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.

 

[79k20350]

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.

Thats what i did, i would like something nicer though

 

[pauly383]

Thats what i did, i would like something nicer though

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

 

[79k20350]

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

Thats a good idea paul...itll take a little bit of wire do it, but good idea

 

[87BrnRsd]

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

 

[dyeager535]

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