Josh from the Early Toyota Truck forums, this is about a Honda hence the off topic post...

Got a 90 Honda Accord EX that I've been working on and trying to sell. All of a sudden it's billowing smoke at startup until it warms up, then its just at hard accel. I replaced the head on it due to 4 burnt valves and I don't remember it smoking then.

Each of the injectors are firing, none seem stuck open. There isn't a cold start injector so that is not stuck open. The smoke does not smell like coolant nor does anything drip from the tailpipes. I pulled the plugs (they only had about 50 miles on them) and they looked normal, maybe a bit black around the edges but the electrodes were still clean. The engine runs great even with the smoke pouring out. The smoke is white/blue and when the engine is rev'ed almost gets brown. Get it on the road and it has great power. Just a huge massive cloud that lasts for several minutes. I've never ever seen a vehicle smoke this much. Any ideas would be appricated.