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  1. 10-09-2013, 04:10 PM #11
    Raptor05121
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    Quote Originally Posted by BoostedFx View Post
    Check your spark plug gap, mine were at. 044-.047 re-gap down to .033 and shudder went away. Plus I got the TSB update for the after cooler.
    What are OEM specs?
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  2. 10-10-2013, 07:42 AM #12
    BoostedFx
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    Quote Originally Posted by Raptor05121 View Post

    What are OEM specs?
    Think it was .037 but many people were finding there plug gaps all over the place. One guy pulled all six of his plugs and ranged from .043 to .058 The problem is in a turbo engine the plugs need to be gapped to a tighter tolerance so as to prevent spark blow out under boost. I believe Ford had a TSB on this mid way through the 2012 model year. My truck is a 2011 built on 06-09-11
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