Mustang Ecoboost Forum - View Single Post - White smoke after 3"catless downpipe
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post #2 of Old 07-05-2016, 07:23 PM
15grey23
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Join Date: Jul 2016
Posts: 1
What you will need to do to fix this problem is raise the idle to 950RPM. You can do this if you have a handheld tuner, which i am assuming you do because of the downpipe. You will also have to have the secondary o2 sensor deactivated or you will get a CEL.

The reason that this happens is because you removed some backpressure, just enough for a drop of oil to leak from the rear shaft seal of the turbo. Just one drop will create the smokeshow that you are seeing.
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