AMC 258 Engine Smoking Through Air Cleaner?
Today I've started an old 1979 AMC Concord with the AMC/Jeep 256ci Inline-6 Engine. The engine has 50K original miles and hasn't been started in about 3 years or so. The first time I started it up, fuel leaked through a worn rubber hose, after replacing it, and shooting some starting fluid in the carb, it started fine but ran a little rough at idle. After giving the engine some gas, it would produce very black smoke from the exhaust and once I let off the gas, it would choke and die out. I could crank again and it would start instantly, rough again, and the same thing over and over. I've noticed, though, that now I can't even give it gas without it choking and dieing. And also, when I turn the engine off or if it stalls, black smoke comes up from the carb but also into the air cleaner from the PCV valve hose.
After letting the engine idle for about 2 minutes or so, the idle evens out, but if I touch the gas a bit, it will choke and die out.
What could the problem be?
By the way, This has all happened today. Also, I noticed some black smoke was also coming out of the top of the carburetor when It stalls too.
Yes, the choke is staying mostly closed at only a slight angle, When I open the throttle part way, it doesn't affect the choke plate unless I "floor" it and it opens the plate slightly more. How do I adjust the choke thermostat? This is the Carter BBD 2 barrel carb, by the way.
(asked by ntl1991 on December 02, 2008)
A: i would have the carb rebuilt if it were mine as far as setting the choke you need to test the choke pull off and the choke thermostat for proper operation before you try to set it up
from your description it sounds like its more than a choke issue (answered by mobile auto repair (mr fix it) on December 03, 2008)
After sitting that long most likely the carb is dirty and something is stuck. If it's blowing black smoke etc and ran fine before it was stored it's probably running very rich. Anyway, you should be able to find the brand of the carb and numbers somewhere like on a tag or stamped in that will tell you the exact model number. Then you can look around for a carb rebuild kit for it. The kit will come with everything including any rubber diaphrams that are needed to fix it. They are cheap also. Good luck.
Also, you may need to drain the gas tank if the fuel is old. If it smells bad I would drain and refill it. (answered by cnc_cut on December 02, 2008)