I'm replacing the hoses and such sprouting every which way from the carb, but some (a lot actually) don't go anywhere... Is there a resource where I can find out where everything goes? There's not too much space to work with but if I knew where everything went, maybe raise my MPG? I'll take better pictures on the weekend. it's just soo cold!! And what exactly does that black cap in the top corner go to? I've never seen it connected to anything in any trucks.
Oh if so, it's long gone now, lol. Under my hood is bare other than timing stuff barely indistinguishable.
was looking for the spare diagram i pulled off an old truck and finally found it... tried taking pics of it but those are no good. pm me your address and i will send you the extra one i have by mail unless someone has a digital copy of one
Help! Ok. confusion and help please! i want to adjust my idle and idle mixture because looking at my spark plugs, my fuel/air mixture is too rich. Now from what i've read, the idea is to adjust the mixing screw to the highest rpm it will reach, then set the idle down to 900, then finally the mixture screw to the 800 spec. Problem: What if I achieve the highest rpm with the mixture screw, but can't bring down the idle anymore, as the idle screw is almost all the way out? Is it correct to unscrew the idle until the rpms no longer drop and adjust the mixture to 800rpms? I'm just a tad bit confused. Well, I guess just a simple question is how do i reset my settings and start from scratch and do it right?!
I think your idle speed is too high to start with, you want to get the idle as low as possible and have it still run, check the throttle linkage for any binding, adjustment or whatever, plus that the choke plate id fully open, so it will idle down as low as you can get it. The idle mixture should be about 1-1/2 turns out from lightly seated, then adjust in or out until the highest vacuum reading or highest engine speed, it shouldn't be much more than 1/2 turn either direction, once you get it, lower the idle speed if its idling high again, and do the same procedure again, once done adjust the idle speed to spec, around 700-750 rpm. If the idle is too high your most likely exposing the transition ports and the idle circuit is not being effected by your adjustments, thats why the screw has no effect when you turn it, plus having the mixture screw all the way out richens the idle which could be causing the sooty plugs.
Ok, so I did it again today like you said. First started with the idle mixture 1 1/2 turns from lightly seated, adjusted the idle screw to as low as it could idle. Everything got really sputtery and violently shaking Then turned the mixture screw out, and it went quite a ways (all the way to about 1150rpm) before turning it out anymore didn't do anything. Then brought the idle down again, tested if turning it in or out rose the rpm one more time, then set the idle to spec. Correct? Right now, I'm pooped and tired. Will I have to do this again anytime soon?
Sounds like you got it figured out, the key is to do the adjusting at slow engine speed so the carb is working on the idle circuit, if its running fast its pulling off the main circuit and the idle mixture won't have any effect when turning. Normally the idle mixture screw is happy anywhere from 1 ro 2 turns out from seated, if it requires turning out a lot further, it might be a sign that its running lean, with the stock carb and beings they are usually fairly close on the jetting, I might check around for a vacuum leak somehwere thats causing it to lean out requiring you to screw the idle mixture out so far, or maybe its just the nature of the carb you have. You can also pull the mixture screw all the way out, blow some air through it with air nozzle and try again, Good luck]
Thanks a lot Nook for your help. I know my hoses are still not all organized as I would like, maybe that's the leak. I'm waiting for the vacuum diagram that rink is sending me to get everything a little bit better. I cleaned my valve cover and most of the block so it's not a big black mass like it is in the picture. I'll take a pic tomorrow and see if I can describe a couple loose hoses if I can't figure it out; for example, i'm not sure where to connect my thermo-valve on the bottom of my air cleaner to on the intake manifold, since all I've been reading there are VSVs, VTVs, BVSVs, and so on. btw, i'm STILL jealous of your OEM dash clock
Good luck, Its the only one I have ever seen in the old trucks, and its still workin, tick tick tick tick
Progress progress. rink's diagram came yesterday, and I fixed NUMEROUS hoses that were going the wrong places. My hot air intake diaphragm works now. it hasn't worked since i bought the truck last july. also, that empty plug on the top of my radiator now plugs into something! i notice my idle went up significantly and i'll have the joy of doing that again once i replace some more hoses that were bad. I'm having trouble finding where the TVSV that the ASV plugs into though (circled and arrow). Anyway, yep good going here! Pics tomorrow...i'm always getting home after dark and doing all this by flashlight.
