Of course it has a three letter acronym. That would be the AIR pump. Well, it would be better described as the pump part of the AIR system. Air Injection Recirculation, I think. The pump pumps air (lowercase, nown) into the exhaust to enhance the combustion of hydrocarbons post engine, usually in the CAT.

This is where Chiltons falls down. I believe the procedure they have in there is for the 2.6. I don't see something specific for the 2.8. Personally, if I were you, I would adjust it as described by Jim Paget in the last link I gave you above and go from there. At the least, you will be able to see if the IAC responds.

As far as infinity vs 0, we'll leave the theoretical mathematical debates for those who find them interesting. For all intents and purposes, infinity means an open circuit, i.e. no continuity. Any kind of continuity will give some sort of resistance (ohm) reading.

Personally, I would start looking over at the s-10 forum that is referenced in some of the posts I gave you. These guys will know their 2.8 stuff way better than Mr. Chilton.

All I can say is keep at it. I don't want to have to come over and fix it for you. <img src="/forums/images/graemlins/smile.gif" alt="" />

Michael

PS: Jim Paget and EdMc are going to be getting coal in their stocking for not helping out here. <img src="/forums/images/graemlins/evil.gif" alt="" />