I got my trooper back from the shop yesterday after they replaced the worn out CV boot and replaced the o-ring in the distributor that was broken. The mechanic told me he advanced the timing a little so it has a little more "pep" (which it does). Before I took it back to them it was idling around 800. Now it is idling around 1100-1150. What should the stock V6 on a '91 be idling at, should I have him re-adjust the distributor...OR...is there an idle adjustment screw on the TBI?<img src="/forums/images/graemlins/confused.gif" alt="" />
Thanks,
Mark

There is a screw on the TBI to set the "base idle", but you'll need to reset the Idle Air control solenoid before you do it. Do a search - there's an article on S-series.org I think that discusses this. 800 rpm sounds right for the base idle, but when the computer is in control via the IAC, mine idles at about 1100 rpm.

Maybe I wasn't letting it warm up enough to see what is really going on. It is still pretty chilly up here. I drove into town and after it warmed up it dropped back to the 800 area. <img src="/forums/images/graemlins/scared.gif" alt="" /> . This mechanic told me that it's okay to advance the timing a little up here in the mountains <img src="/forums/images/graemlins/confused.gif" alt="" /> I don't think it's been given very much attention given that fact that I ran thru a whole can of CRC to clean the TBI <img src="/forums/images/graemlins/frown.gif" alt="" />