I am looking for help and understanding with my truck. I drove it from FL to TX and it ran rich....extremely rich. 100 miles to a tank rich. I bought a carb (Weber man trans, electric choke) but have not installed it yet. I replaced the O2 Sensor just below the exhaust heat shield and it seemed to run a bit lean for about 200 miles then started running rich again, giving it a misfire feeling. I have recently bought another O2 sensor to install just in case the other one failed. I am not sure if it is a carb problem or an O2 sensor issue.
Question 1. Why does a carb'd truck have an O2 sensor? Is it for the electric choke? The electric choke has never worked since I have owned the truck.
Question 2. the tube that runs from the exhaust shield to the intake of the carb needs to be hooked up but why? Would that change the way that the carburetor functions?
I have just returned from Germany and my truck has set for 4 years with one of my parents driving/starting it every week. I have replaced the plugs, wires, distributor cap, brakes, brake master cylinder, O2 sensor.
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