When I see white smoke the first thing I think of if it doesn't clear up in a few minutes of running is a cracked head or blown head gasket usually due to overheating. This is not too common on Deloreans but it can happen. Pressure test the cooling system to rule out. With pressure on while running the pressure should't drop and the amount of smoke comming out shouldn't change. There are also more involved tests such as testing for products of combustion in the coolant, compression tests on the cylinders, and leakdown testing. Does the cooling system always produce bubbles, and are you adding coolant? On the other hand are you adding motor oil and do you know what your fuel consumption/mileage is. All of these factor into a diagnosis. Put your finger into the exhaust pipe, is it dripping wet, black and flakey, or just oily? Make sure the motor oil level is not "over full". This could cause oil burning. --- In dmcnews@xxxx, "DMC Joe" <dmcjoe@xxxx> wrote: > If the smoke has a blue tint and smells oily John is correct, on the other > hand if the smoke is pure white it may be caused by un-burnt fuel in the > combustion chamber. This problem is usually a result of a malfunctioning > cold start valve, fuel distributor, or out of tolerance CO adjustment. > > "We're here to help you" >