If I remove the A.I.R. tubes and smog pump but keep a cat. will it pass emissions with headers and clean running motor. Anyone done this and passed?

 

thats a good question becasue i'm doin a tru dual setup like fastthirdgen did and i'm removing the pump and other junk but plan on trying and throwing on a cat on each side after the muffler durin emissions testin only. but i live in ny and my car has to go on a dyno and run to pass emissions so i don't know

 

C'MON GUYS, SOMEONE HAS HAD TO TRY AND PASS W/O THIS STUFF. OPINIONS?:lala:

 

nobody has any input here????

 

im in long island new york, and passed emmisions with a rotting cat and no air tubes or smog pump. plan on replacing with new cat and full exhaust including headers in the spring, but i wouldnt worry the pump is just one of those things that is there becuase it always has been it is pretty much useless

 

but still have the pump hosed to the CAT. Passed with no problems.

 

Thanks for the input guys. I'm gonna consider removing the air tubes and the air pump, but leaving the cat. By the way, do you guys have a tpi setup with a computer?

 

A good running motor with only a cat will pass the dyno sniffer even without the AIR system. However, if you have a visual you will prob run into problems. In Indiana, they look under the car for a cat and they didn't say anything about it not being hooked up to the AIR system.

 

Yeah, in Roselle IL, they never looked under my hood whenever I went in for emissions. They did however put my car on a dyno for the emissions test.

I think I'll wait till my T/A is due for another E-test and after that I'll remove the A.I.R. and stuff. But I'll leave the cat as I don't mind having it.

 

if you just remove the tubes and pump isn't the cat gonna end up clogging because air isn't being injected into it???

 

will removing the AIR tubes and pump hurt performance on an 86 tpi?

 

I posted on my emissions experience a few months back. You might be able to find it by doing a search. In a nutshell, on my '90 350 TPI I had 12* initial timing, 50 psi fuel pressure, no air tube to cat or smog pump and still passed with 1/3 of the max emissions (i used a Dynomax 3" superflow cat). As far as clogging, its not a problem because I flanged my cat and an equal length of straight pipe. After I passed, I unbolted the cat and bolted in the straightpipe. Hope this helps.

-Kyle

 

i think it all depends on where you live, what the inspector does when he inspects, and what condition the rest of your stuff is in.

i think though that most of us take that stuff off knowing that we have a buddy or whatever that can give us inspections without caring.

-Brian

 

I think I can answer a couple of the questions. The CAT won't plug by removal of the AIR tubes. The AIR tubes are only used when the CAT (and engine) are cold. Injecting the air at the exhaust port adds the extra oxygen needed to burn off any excess hydrocarbons during cold operation, like running slightly rich due to choke being on. The system has a control valve for that (AIR management valve).

When the CAT warms with the engine the catalyst start doing thier job, and a vacuum signal is sent from a temperature controlled vacuum tower screwed into your intake to the control valve and then the control valve shifts all air to the CAT...the extra air in the CAT helps it out also, but only after it's warm. Air is cut out to the exhaust AIR tubes altogether. The tubes are only a cold engine emmission requirement!!

So long as you keep the pump, and hose it directly to the CAT - It'll work...it just takes the CAT a little longer to warm up. Don't get your car E-checked when the engine's cold however...