I have a 97-Z28 ODBII. Is there a way to bypass the (2) AIR (top of LT1 exhaust manifold/headers and (1)EGR (lower part of exhaust header) in a configuration that allow it to not throw a code? Something OTHER than just blocking off the air/egr fittings. Because just blocking off the (2) AIR & (1) EGR will throw an SES code that requires PCM reprogramming (we all know that already) but you will still fail inspection because the air/egr is programmed out of the PCM, that will not fly here in TX. So I guess I'm having a hard time looking at this setup and understanding the big deal. The AIR/EGR hookups just appear to me that they merely are pumping air/unspent fuels etc back into the exhaust, so does this mean therefore that there is a sensor/electronic device that senses an interrupt when you just block off all this stuff? If so it would seem to me one could plumb something that simulated flow, or hell just don't block off anything and let it flow. If there was something that explained how this all worked to begin with online I'd love to read about it. I'm debating JetHot longtubes with the air/egr/02 sensors already welded on, but I'm also considering plain jane hooker LT's with just the 02 bungs on the collectors.

thanks in advance for any feedback.

 

the air pump wont cause you to fail, all it is is for cold startups gets the cat heated up. Assuming your not getting your car towed to the inspection site, youre fine.

The EGR pumps burnt exhuast back into the engine in an effort to cool the internal temp and reduce NOx emissions. Although hot exhuast is hotter than the cold air coming in, it can not be detonated and it cools everything down in there. Good luck passing without your EGR

 

they don't sniff 96 + here so that's the easy part. It's when they run the comp test and see the AIR/EGR is programmed out for that fails you. That's what most do that block off the AIR/EGR and that's different than what I want to do. So are you saying there is an EGR pump and a separate AIR pump or it performs two functions.

 

yes, two entirely different fuctions. one is to warm the cat, the other is to reduce combustion temps and as a byproduct - reduce NOx (or the other way around depending on how you want to look at it)

 

thanks but I think you missed 1/2 of what I was after here appreciate the effort though.