before this gets bumped off as not technical enough for advanced I'm looking for the hightech details of how this system works (be it electrically and how the plumbing works, both AIR & EGR) and a better way around air/egr withouth having to hook it up to headers. Which would include info on how it ties electronically to the PCM and a way around it without having to program the pcm or hookup the air/egr.

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.

 

I'm interested in getting pinout information for the code scanners. For example, when they do the emissions checks, what kind of data are they looking for? Does the scanner just test if the EGR solenoid / AIR pump is there, or does it do something like read values for a couple seconds and see if they fall within some boundary margins?

If the OBDII PCM can truly be programmed, couldn't you just tell it to spit back some bogus "readings" to make it pass a scanner test?

 

I wish I knew, I'm trying to get in depth and so far I'm just getting the basic feedback. I should buy a tech manual I guess but figured I would get better feedback here. In my opinion by understanding the entire process it's how we become more in depth if creating more practical mods, I do realize you can only do so much, but the popular answers like, block off your egr/air and install an ODB I is not what I was looking for.

 

This does NOT belong on Advanced Tech. You have a choice of either LT1 Tech or Computer Diagnostics.....

I can not understand how you would choose AT over "Computer...." Makes no sense at all.

Moving to "Computer.....

 

It is to my understanding whenever the EGR is expected to open, the computer expects a drop in the MAP reading, if the pressure doesn't drop then you get the dreaded SES light. I know someone from the LT1 Tech section has made an EGR Simulator that would trick the computer into seeing that drop in pressure, that way everything seems fine when you scan the computer.

Hopefully I got this right.

 

LOL..ok if that makes you happier. You have a demeaning way of going about your moving posts around. You could have moved it and made a suggestion, that's how people learn. And furthermore it involves both AT and PCM tech so it's just a judgement call, so it does make sense when you look at both aspects of the question in the post.

 

...finally...now this is what I was looking for. Could you get me in touch with this person perhaps?