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1997 to 2003 F-150
4.2L, 4.6L, and 5.4L equipped F-150s.


 
 
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Old Tue, May 26th, 2009, 11:40 PM
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Canned tunes most certainly can be too lean. Obviously, it depends on how the files were tuned. In general, closed loop shouldn't present much of a problem since load is relatively low. Open loop, on the other hand, is where serious damage can occur. If the open loop tables are too lean, bad things happen.

On the other foot, I guess you could make an overly conservative file. We generally call those "Stock" though.
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