Melted Manifold?!?!

Discussion in '2004 - 2008 Ford F150 Truck Forum' started by Sonny1967, Apr 23, 2021.

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  1. Sonny1967 Vet Zone

    This is a first for me. My 2008 SuperCrew 5.4 V8 3V motor was replaced at 160,000 miles. A motor with 68,000 miles on it was used and it was warranty provided. One year and about 13,000 miles later I need another motor. Three mechanics all said the same thing. I just was curious as to why would the intake manifold burn up/melt away on one side?
     
    Sonny1967, Apr 23, 2021
    #1
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  2. FTZ HAIC Staff Member Oregon Chapter Founding Member

    Perhaps an intake valve leak allowing burning air fuel into the intake tract. Also, if you've ever tried the "Seafoam" treatment (which is a bad idea), this can cause this. If it runs slightly lean which makes the heads hotter, and it idles for very long periods of time, that could cause it. Its really hard to know for certain without seeing it.
     
    FTZ HAIC, Apr 23, 2021
    #2
    Sonny1967 likes this.

  3. Sonny1967 Vet Zone

    I have a couple photos.
    20210421_135644.jpg #ad
     
    Sonny1967, Apr 24, 2021
    #3

  4. Sonny1967 Vet Zone

    Sonny1967, Apr 24, 2021
    #4
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