2007-01-07 12:51:34 · 11 answers · asked by PLYMOUTH DUSTYA 3 in Cars & Transportation ➔ Car Makes ➔ Chrysler
Black soot is gas, Blue is oil
2007-01-07 12:55:08 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Rich gas mixture like the answers said. Also, if you had put a gas additive to the gas this may cause black soot as the additive slowly takes off the carbon from inside the engine and it is burned out thru the pipes. . You may even experience rough running till all the soot inside the engine is burned off. Changing from regular and then putting high octance may cause this too. Both the additive and octane are only temporary. You did not say if this problem just started up or have had it for a long time.
2007-01-07 21:31:50 · answer #2 · answered by Big C 6 · 1⤊ 0⤋
too nuch fuel comming thru the carb. If you're a part-time mechanic, or try doing most of the oil and sparkplug changes yourself. get a portable dwell/tach meter and hook it up (instructions are included) start the car with the breather off of the carb and at the front of the carb are 2 screws at the bottom front, these are the fuel jets (depending on the size of the engine) let the car run to normal operating temp, run at idle of about 600 rpm,, turn 1 screw out about 2 turns, then very slowly turn it clockwise (in) and watch the meter. when you see the needle start to drop, then stop turning the screw and bring it back out (counter clockwise) till the needle goes back to its highest point. Then do the same thing with the other screw. Once youv'e completed this, your fuel jets should be set and you should not see any more black smoke comming out after a bit. if it persists, then have the carb rebuilt and reset. this chould cure the problem
2007-01-07 21:04:05 · answer #3 · answered by greywolf 2 · 1⤊ 0⤋
Your fuel/air mixture is too rich, and the engine is not completely burning the fuel. Adjust the carb for a leaner mixture. If you cannot lean it out enough, you may have blown a power valve. I don't know if the Duster used a power valve for sure, but my '71 Bronco has blown a couple.
2007-01-07 20:55:22 · answer #4 · answered by J.R. 6 · 1⤊ 0⤋
If it is one of the 4-bbl cars it is much too rich and you are dumping unburned fuel out the back. Regardless if it has been doing this for awhile you are in dire need of spark plugs and a general tune up This engine (if you are interested in high performance) is very sensitive to plug fowling.
2007-01-09 19:47:40 · answer #5 · answered by cessna0518 5 · 0⤊ 0⤋
it could be a number of things plugs worn down so regap to .035 then check timing clean out intake with some sort of cleaner rev up engine to rid carbon off valves
2007-01-07 20:55:50 · answer #6 · answered by accomacgeo 4 · 0⤊ 0⤋
A lot of un-burned gas. Either auto-choke valve is not opening properly, or carb needs adjusting or repair. Could also be a dirty air filter.
2007-01-10 01:05:12 · answer #7 · answered by badbill1941 6 · 0⤊ 0⤋
sounds like your car is running a bit rich on the gas/air mixture...
this could be caused by a dirty air filter or by carburator adjustments.. check the filter first.
2007-01-07 20:59:27 · answer #8 · answered by ♥Tom♥ 6 · 2⤊ 0⤋
Carbon build up
2007-01-10 12:00:22 · answer #9 · answered by astro 2 · 0⤊ 0⤋
the air/fuel mixture needs to be adjusted ... the fuel mixture is too much compared to the air mixture
2007-01-07 21:00:24 · answer #10 · answered by rivr_rat1 1 · 0⤊ 0⤋