My 03 wrx suddenly started blowing smoke

check and test for blown head--intake gasketdamaged water acket ----------pull plugs check for coolant/water being burnt ---

Hello Aaron, Bad valve seals can cause your engine to smoke after start up and clear up after a few seconds of running. Sometimes the valve seals become hard and brittle. They can break up and restrict the oil return holes in the cylinder heads, causing oil to seep into the cylinders through the valve guides.

sounds like a blown head gskt,water getting into cylinder and drowning out spark plugs causing car to die

turbo pipe split .have a good lok and you will find it .

You don't mention what that smell is reminiscent of?

You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?

You don't mention whether the road behaviour/performance is normal?

White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.

Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.

Burning oil smells a bit like burned eggs in the frying pan.

If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...

low fuel psi, posible fuel pump, think it needs about 110 psi to run

if the oil is worn out then you will suffer no preesure,hence the knock,try changing the oil and filter.thenn if the knock persists,you may need to rebuild your engine.

this can be serious, like a blown head gasket or cracked head. has it been overheated lately? good antifreeze used? even then you can have head problems, are you losing water? oil? check the oil and look for water in the oil, check the water and look for oil in the water, is the water abnormal looking? rusty? all these are symptons of head problems

You may want to check the ignition system. The smoke could be because of unburnt fuel. You may be running on less then 4 cylinders. Check if all spark plugs are firing. You may also want to use a scanner if there are error codes found in its ECU.