I bought a 1991 240 SE Wagon Automatic Trans w/ Overdrive. It was not turning over or starting when I bought it but I did the following - replaced, distributor cap, plugs, fuel relay and nuetral switch. It started right up but was running real rough and very rich. Yesterday I moved the car in the driveway and when I went back it would not start. It is turning over but not firing up. I have no idea what it could be. What would suddenly keep it from firing up.
I have access to several similar cars at a salvage yard but do not know what to get. I also need to change the Oxygen Sensor but do not know its location. Is it the spark plug looking thing that screws into the exhaust pipe under the car. It has wires coming off it it. If thats not the O2 Sensor then what is it. My mechanic told me to change it. Thanks to any and all advice.