it blows it when i rev it up and when im cruising and let off the gas it ll throw some. while im giving throttle it doesnt.. i gave it a tune up and the spark plugs looked great. no oil or anything. the carb looks bad. it stalls sometimes. could the carb cause black smoke and how?
2007-05-21 05:20:07 · 4 answers · asked by buickwc67 1 in Cars & Transportation ➔ Maintenance & Repairs
Sounds like the choke is stuck closed, or the fuel bowl float is stuck and dumping gas into your engine.
2007-05-21 05:29:45 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Black smoke can be caused by an extreme rich fuel mixture.
This could be caused by several things such as a stuck or mis adjusted choke, stuck metering rods, or bad float valve.
I would rebuild the carburetor, or if it is beyond your skill level, have it replaced. It is not worth having a mechanic rebuild the carburetor as the rate per hour would quickly exceed the cost of a new carburetor.
This engine used a Rochester Quadrajet 4 barrel. I would only consider having a mechanic rebuilding it if you want to keep it factory original considering its age.
2007-05-21 05:36:46 · answer #2 · answered by Mad Jack 7 · 2⤊ 0⤋
Sounds like it is running rich. If you're not real familiar with carburetors, find a good shop and have them go through it. You probably have an idle air jet clogged up. Be careful though, alot of shops won't work on carburetors anymore. I think their techs are scared of them.
2007-05-21 05:26:08 · answer #3 · answered by rat396 4 · 2⤊ 0⤋
Usually when your engine blows smoke--it is because your piston rings are worn out. If you have them replaced and your valves ground, and new bearings put in, your engine will be like new.
2007-05-21 05:25:31 · answer #4 · answered by Nemo the geek 7 · 0⤊ 3⤋