Did you check the radiator coolant level or just the reserve tank?
If the engine is shaking, it is misfiring and the white smoke is most probably due to excessive gas being processed by the catalytic converter.
You need to check the spark plugs, observe which cylinder is not firing well through the carbon buildup on the plugs and you might find out which cylinder is not working well.
Could be plugs, coils, injectors or their wiring.
Tuesday, July 1st, 2008 AT 11:41 AM