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i have this exact same problem. I asked a question about it a few months back with no replies. For the stock file, you have the option to enable the EGR (even if the truck didnt come with it) and i...

Is there a reason why you cant enable and disable the egr in the 2bar OS? I put my wideband thru my EGR, and it worked fine with the original OS, but on the 2-bar OS there isnt this option and...

ok, so now, what if im also connecting a gauge to monitor A/F when i dont have the laptop handy... would grounding the sensor to the block be fine without sending the ground to the PCM, or would i...

Well, it wouldnt let me pull the pictures out, and I dont have access to a scanner, so printing and scanning was out, but i'll do this...

04 8.1 EGR - 5 pin connector - Black

Pin A - White Wire...

Well, from the availability of pinouts i have, it appears to me, that in 05 they changed things, as pin 55 on the 05 pinout is "Not Used" on the 05 8.1l. I also looked further back, and apparently,...

PCM C1, Blue Connector - Pin 55.

My 2004 Silv. 4.8 says - Not Used
2004 Silv. 3500 8.1 says - EGR Valve Position Signal

Thank you for your assistance thus far! I have compared the pinouts for an `04 8.1l with my `04 4.8l and have found that all pins are basically the same, except the 8.1l has pin 55 as EGR position...

Okay, so the 8.1 has the same PCM? I was talking with one of the techs at work (I work at a chevy dealership) and he told me that they were NOT the same.

I've been reading alot on this subject recently as far as people hooking up their widebands through either the EGR or the AC Pressure lines and logging them without having to get "upgrades". I have...