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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 05-23-2012, 06:03 AM
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60DRB 60DRB is offline
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As you sped up the vacuum pressure changed (normal). The re-occurance of the grinding at that time indicates there is still a leak somewhere in the 4x4 vacuum lines, or a bad IWE internal seal. Have you checked the two (one way air flow) check valves? They are often overlooked when trouble shooting.
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04, 4wd, brakes, engaged, engaging, f150, fly, grindingrubbing, horrible, idle, loud, makes, noise, problems, scraping, shift

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