5.4 with a misfire that I cannot explain. Who is an engine wizard? - Power Hungry Performance Forum

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5.4 with a misfire that I cannot explain. Who is an engine wizard?

2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.

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#1

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Tue, August 14th, 2012, 10:50 AM

FX MORE

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I do have custom tunes on the programmer.

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#2

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Tue, August 14th, 2012, 01:38 PM

Longshot270 Longshot270 is offline

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Tune the truck back to stock and check every few trips for DTCs. Until we have those, there is no way to be sure what is wrong.

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Usefull links:
Searchable DTC list
Gryphon data log instructions

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5.4l, idle, misfire, miss

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