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ok- that raises another question: Is there any trace of oil in the coolant? When the EGR cooler leaks, a few things can happen- the coolant can go in the oil, or oil can get in the coolant, depending on operating conditions. Did you do the pressure test when the engine was warmed up to normal operating temp? The white smoke could be caused by a number of things, but I would check the cylinder compression and pressure test the coolant system. You may have a blown head gasket or even a turbo failing. Is there any condensation or water from the exhaust? There is a small coolant reservoir next to the master cylinder, on top of the motor and next to the turbos. This is the turbo cooler reservoir- Have you checked to make sure it is full? At full throttle, the boost gauge should reach about 35 psi at 2200 RPM or a little before. A significant change in the boost should be recognized as it transitions from the low speed turbo to the high.
If you do not reach full boost, or if a power loss os observed during the transition- you will need to read the codes while the engine is running. I believe you have more than an EGR cooler problem, from what you have said so far.
Last edited by mlj3nx; 03-30-2012 at 07:56 AM.