First Weekend Update
Roast em' if you got 'em
Joined: Mar 2005
Posts: 21,997
Likes: 9,885
From: Rio Rancho, NM
Ok, now we're getting somewhere.
I can't remember, had this truck been sitting for along period before you started driving it? If so then some of the circuits inside the carb are probably plugged up.
The first thing to do is to see if you can ge it to idle on its own. This usually means messing with both the idle mxture screws as well as the idle speed setting. If you can mess with the idle mixture scres and it doesn't effect the way the truck runs then the idle mixture circuit inside the carb is plugged up. Sometimes (but not very often) you can clear it out by trying the following; with the engine running in nuetral, raise the engine speed to approx 3500rpm, then slam the choke plate shut (or slam a rag over the top of the carb) let it draw the engine down until it almost dies but not quite, then openthe choke (remove the rag) and open the throttle and let the engine clear itself out, repeat several times. Like I said, sometimes it helps, sometimes it doesnt.
For a basic start from scratch setting on the idle mixture screws, run them in all the way (don't tighten them down tight, just "seat" them) now back them out approx 2 1/2 to 3 turns. Start the engine and start adjusting them in a bit. You want to slowly run them in until the engine starts running rough and then back them out a bit to smooth it out. At the same time you want to keep the idle adjusted to approx 600 to 800 rpm or so. If its a 1 barrel carb there will be one idle mixture screw, a 2 brl-2screws.
You might be able to find a manual or a diagram of your carb on this site;
http://www.oldcarmanual.com/
If the carb is plugged up internally a rebuild kit is fairly inexpensive and can be done at home with some basic tools and patience.
Bobby
I can't remember, had this truck been sitting for along period before you started driving it? If so then some of the circuits inside the carb are probably plugged up.
The first thing to do is to see if you can ge it to idle on its own. This usually means messing with both the idle mxture screws as well as the idle speed setting. If you can mess with the idle mixture scres and it doesn't effect the way the truck runs then the idle mixture circuit inside the carb is plugged up. Sometimes (but not very often) you can clear it out by trying the following; with the engine running in nuetral, raise the engine speed to approx 3500rpm, then slam the choke plate shut (or slam a rag over the top of the carb) let it draw the engine down until it almost dies but not quite, then openthe choke (remove the rag) and open the throttle and let the engine clear itself out, repeat several times. Like I said, sometimes it helps, sometimes it doesnt.
For a basic start from scratch setting on the idle mixture screws, run them in all the way (don't tighten them down tight, just "seat" them) now back them out approx 2 1/2 to 3 turns. Start the engine and start adjusting them in a bit. You want to slowly run them in until the engine starts running rough and then back them out a bit to smooth it out. At the same time you want to keep the idle adjusted to approx 600 to 800 rpm or so. If its a 1 barrel carb there will be one idle mixture screw, a 2 brl-2screws.
You might be able to find a manual or a diagram of your carb on this site;
http://www.oldcarmanual.com/
If the carb is plugged up internally a rebuild kit is fairly inexpensive and can be done at home with some basic tools and patience.
Bobby
