[dshepp806]

My '89 never really idled at the spec'd 880 RPMs...no idea if it (base idle) was ever tweaked, as the yellow cap was in place and looking quite original...decided today to pop it off (it crumbled-basically) and have a go (with jumper in place.....). The process worked quite well,..as she dropped idle (a good bit) when the jumper was applied. THIS, as I understand it, should roughly center the ICV, essentially for a baseline point for the DME. My adjustments brought on changes, for sure. I could never really hit the exact spot I wanted with jumper in place),..but a slight tweak (jumper off) placed her at 890 RPMs,..and that's where I left it.

I, too, checked my O2 sensor's output,..and found it to be dead on 51 DC millivolts (.051 DC volts),..so I was reasonably content that all is well. I have yet to TOUCH the mixture, without getting my hands on a wideband sensor. Unfortunately, no one else at home to rev her while watching me meter......I'm gonna' get the mix checked next, as I understand these 2 adjustments are itterative (base rpm idle & CO2/HCC mixture).........as the engineering type would be: I'm not about to "tweak" anything without the instrumentation,..hello Lambda, I'd say.

I think it's time to freshen her up with a new O2 sensor (preventively)......why not?

Good work!

BEST!

Doyle