In an attempt to solve a dieseling issue, I tried to adjust the idle on my boat tonight. Here's what I noticed;
Once the engine was warm, I adjusted the idle screw, there was no change in engine speed. Turned back the other way ( few turns), same thing, no change. I grabbed the linkage to exercise it and found that it apparently wasn't seating all the way against the idle screw. When I seated it, the idle pulled down.
So, I got it adjusted to about where I want it (700 to 750 in gear), but if I move the throttle then reset it to neutral or idle, it idles about 1000 to 1100. If I gently nudge the linkage, it goes back down to 700/750. The throttle linkage to the binnacle seems to be adjusted in about as far as it can, so I've got nowhere to go there.
After surveying it, it looks (to me anyway) like I may be missing a return spring. Attached is a pic of the linkage, can someone please confirm or deny my thinking?
EDIT: This is a 2bbl Holley on a 2000 4.3GLPEFS with an SX-M sterndrive.