Hi
I have a 1986 f-150 carbed 4.9 L that idles very rough and emits black smoke. I am replacing vacum hoses but I don't think that is what this is. The truck has 53435 original miles on it. I have replaced plugs,wires,roter button and cap. It has a new thermostat but runs cool. (Running rich?) Any ideas would be appreaciated.THe choke is open when the block has some heat
Last edited by e.sedgwick; 12-21-2006 at 04:29 PM.
Hi
I have a 1986 f-150 carbed 4.9 L that idles very rough and emits black smoke. I am replacing vacum hoses but I don't think that is what this is. The truck has 53435 original miles on it. I have replaced plugs,wires,roter button and cap. It has a new thermostat but runs cool. (Running rich?) Any ideas would be appreaciated
Yes the black smoke indicates it is running rich. The first thing to do is make sure the choke butterfly is opening up, if you haven't already done that.
The choke opens. I am thinking electronic module control on distributor?
My next guess would be the float in the carburetor has a hole in it and is partially filled with gas, or the needle and seat in the carburetor isn't seating as it should. I don't think it's an ignition problem. Hopefully someone else will chime in here and say what they think.
1986 carb idle trouble
Re: 1986 carb idle trouble
