You need to start a new question. When you piggyback on a previous one, I am the only person who is going to get an automated e-mail directing me back here. No one else is going to see your post or be able to reply. That is doing yourself a disservice.
An EGR valve will not cause smoking from the tail pipe. All that valve does is redirect exhaust gas, which is supposed to be going out the tail pipe anyway, to run back through the engine again, then out the tail pipe. When the valve sticks open, it can cause a rough idle or even stalling, but it is supposed to be open under most driving conditions while at higher speeds where you won't notice it.
There will be some water vapor leaving the tail pipe, maybe even dripping water. That is a byproduct of a properly working catalytic converter. A lot of white smoke is a sign of burning coolant. Blue smoke is engine oil, and black smoke is too much unburned fuel.
Thursday, May 17th, 2012 AT 5:43 PM