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Black smoke is too much fuel. My guess would be that there is an injector that is stuck open draining the pressurized fuel into a cylinder or several cylinders. And that is a considerable amount of fuel. And it would account for the hard start because there isn't any fuel being pumped into the other injectors until the pump builds the pressure back up.
I have seen this on old cars, my suspicion is that the seals on the valves are a bit worn. This allows some oil to get through during start up. Since it quits smoking, I would not be overly concerned. However, since it burns a quart every 1-2K miles, I am curious what the compression is. My Fiero does the same thing (occasional puff of smoke on start up) but does not need oil between 3,000 mile chages. It is a 2.5 liter. Here is nice tip: check compression on all cylinders, then recheck it adding a teaspoon of 2 cycle oil to the cylinders (one cylinder at a time). Some have said to use conventional oil for this, due to higher viscosity, but I always thought it might foul the spark plugs. If the compression goes up, it is ring wear, if not it is leaking through the valves.
nno
it is water vapour caused by the steam from combustion and condensing in a cold exhaust system
the reason it goes away is the whole system gets hot and you don't see the "fog" of the condensation
It is the same effect as your breath leaves "fog" from your mouth on cold mornings
It sounds like it's getting more fuel then it is air check the fuel filter and the mass air flow sensor it regulates the amount of air send it to the computer and the computer breaks down how much gas to operate the vehicle and run smooth hope this helps text George
white smoke out of the exhaust would be a sign that it is burning coolant... if it goes away after it warms up, it could just be condensation inside the exhaust pipe. 1800 rpm is a very high idle, maybe have your IAC motor on the throttle body checked... check engine light? if so have the code read at your local auto zone.
check your fuel pressure, slightly low fuel pressure can cause this and it is possible that your other coil is breaking down under heat. also it could be as simple as your plug wires breaking down under heat
Your issue would be bad "valve stem seals". They are hard rubber seals that wrap around the valve to seal out oil, and prevent it from going into you cylinders. When they get old and worn out, they will allow oil to seep into the cylinders.
white smoke is water blue smoke is oil. nest time try and smell the white smoke see if it smells sweet? if it does its antifreeze. and also black smoke is fuel (like a leaky injector ) hope this helps paul
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