Mention this to list with trepidation because it usually ignites flame
war, but IMHO is important:
At same time JZD was messing around with idle speed motors, Volvo just
used brass screws already built into PRV to set idle. Low tech, yes,
but less subject to problems. I think every owner should know how to
use in case automatic idle system fails or needs diagnosis, if nothing
else. Simply advising "just snug down and never worry about them
again" deprives owners of a valuable feature ALREADY IN PLACE (no mods
necessary).
FWIW: is the ONLY idle system on #5939, and you saw first hand how
well it works.
Side note: you've got ignition "advanced" and "retarded" flipped:
advanced is early, retarded is late. Might confuse someone's advice if
they didn't listen carefully to full explanation.
Bill Robertson
#5939