1972 240z with a 280z engine, just did an oil change, alot of the wiring isnt hooked up, but when i start the car, it idles great, runs just as good so far, but it spits out some damn thick exhaust, there is no cat on this car ;p, but even for a car with no cat, but there is even to much exhaust for no cat, any ideas on how to tune it so it doesnt do this, or as bad? thanks, james

I would like to help you but I cant figure what the hell you are talking about. Are you saying that there are a lot of fumes , smoke and such , coming from the exhaust? You say that you have a 280 engine , how is it fed by SU round top carbs or fuel injection ? Is the engine in tune ? how are the spark plugs, rotor , dist cap ? Are you running points or a later ignition?