LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

AIR Pump and Emissions

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Old Jan 15, 2010 | 12:17 PM
  #1  
Queens94z28's Avatar
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AIR Pump and Emissions

I am currently building a mild 355 with AI Heads and Cam. The whole setup will be emissions friendly as I have to pass the NY sniffer.

I am keeping the EGR but was wondering if I can delete the AIR system and still pass. I think the AIR only works on cold start up, but could be wrong.

Any help is appreciated.

Thanks!
Old Jan 15, 2010 | 02:52 PM
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Yes only works for a minute or two on a cold start. Just get her nice and warm before you go to your emissions test.

I know our cars are different years but i just passed emissions here in Maryland with LTS, and an ORY. Gotta love o2 simlulators!
Old Jan 15, 2010 | 03:08 PM
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Where in NY are you? I'm assuming downstate near the city.

Just reprogram your AIR system out of the PCM, and you'll pass.
Old Jan 15, 2010 | 03:23 PM
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I am in the city. I hate taking it for inspection because they put it on the dyno and the operators dont know what they are doing. So I will just have the tuner delete it when I get my dyno tune on the new motor. As long as its good and hot, I shouldnt have a problem right? Any adverse effects to the cat once I remove it?
Old Jan 15, 2010 | 04:59 PM
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Since your 94 is OBD-I, you don't need to program AIR out of the PCM to avoid a code/SES light. You can remove the entire system, and as long as the fuse for the AIR pump, and the relay are good, you will not get a code. They only added the checks for actual air flow into the exhaust on the OBD-II cars.

Do they do any kind of visual inspection?

The possible downside would be saturating the cat(s) with excess fuel on the very rich cold start mixture, then having the leaner closed loop exhaust cause the catalyst to overheat. That's the theory, but whether it will actually happen is unknown.
Old Jan 21, 2010 | 01:45 PM
  #6  
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Originally Posted by Queens94z28
I am in the city. I hate taking it for inspection because they put it on the dyno and the operators dont know what they are doing. So I will just have the tuner delete it when I get my dyno tune on the new motor. As long as its good and hot, I shouldnt have a problem right? Any adverse effects to the cat once I remove it?
I removed my air pump when did headers&the cat. is so far unaffected.Btw i bought a Mac off road pipe to replace the cat just in case.There is no emissions test here
Old Jan 21, 2010 | 08:37 PM
  #7  
96SSIndeed's Avatar
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From: Livingston, Louisiana
Originally Posted by canuck94z28
There is no emissions test here
thats why i love louisiana. lol
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