I'm interested in how this works out.
I've recently installed BP Automotive's fan upgrade wiring kit in my stock 2001 4x4 5.3 Chevy Tahoe.
As part of that upgrade BP Automotive sent me a 2002 12212156 O/S to flash to my PCM so that the fans would work properly.
With the small amount of testing I've done so far the fans seem to work okay but I noticed my EGR and AIR had stopped working.
EGR was disabled in the O/S they sent me so I enabled it and set all the EGR DTC's to mach my original O/S but the in last test run I still had no EGR or AIR active.
After reading your posts I'm now being to wonder if my EGR can't actually work with 12212156 O/S?
I know there is debate on the pros and cons of EGR but looking back over my logs of before and after the E-fan install I've lost gas millage @55-65MPH presumably with the EGR not working.
So at this stage I'd like to be able to get it working again.
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