White smoke after 3"catless downpipe - Mustang Ecoboost Forum
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post #1 of 2 Old 07-03-2016, 12:56 AM Thread Starter
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White smoke after 3"catless downpipe

I have a 2016 ecoboost and have no mufflers , resenator. I had the one cat on the stock downpipe, after getting a 3" catless downpipe installed my exhuast smells like gas fumes and white smoke every now and then at idle. Any idea why it's happening and how to fix it?
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post #2 of 2 Old 07-05-2016, 07:23 PM
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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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