AIR Injection is an air pump which puts air into the exhaust manifold to help burn unused fuel. Take the pump out and remove the internals and put it back in to keep the same belt. You can remove the hoses and lines from the manifolds and plug them with pipe fittings. However, you will want to remove your cat as you may end up with more unburnt fuel in the exhaust. The upside is that you won't be drawing power off the crank-pulley to run the belt and exhaust temps will be cooler. NODIH can add more!
ECM won't know the difference. It doesn't have the processing power to check for it.
Been there done that. I removed the AIR pump on my 307 when I dropped in a 350 Olds, stock ECM and it never knew.... I wasn't gonna drill my heads for those air manifolds to be bolted in, so I said screw it .
I always suspected it ran a little rich after that though, I figured as the O2 sensor was counting on some of the O2 that it saw was from the AIR pump, which was not anymore. But it didn't hurt and never a check engine light.
Duh! Smack (hitting myself in the side of the head)! You have v-groove belts, correct? Now that the 85 is gone I'm used to a serpentine. By all means, if there is only one belt solely for running the pump, take the whole darn thing off!