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Welcome to SportTrac.Org
Off Topic Discussion
Help!! Changed parts and not fixed!!
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<blockquote data-quote="scott degroot" data-source="post: 791655" data-attributes="member: 66039"><p>FWIW all 4.0(with plastic composite plenums) have an issue with the intake gaskets failing, to be specific it is usually the plenum gasket/o-rings that fail. But with any vacum leak they rear there ugly heads usually when at 1500 rpm or lower. A vacum leak will cause all the symptons described above but unless you have a MAJOR & I MEAN MAJOR vacum leak it is usually of no concern at cruise rpms.</p></blockquote><p></p>
[QUOTE="scott degroot, post: 791655, member: 66039"] FWIW all 4.0(with plastic composite plenums) have an issue with the intake gaskets failing, to be specific it is usually the plenum gasket/o-rings that fail. But with any vacum leak they rear there ugly heads usually when at 1500 rpm or lower. A vacum leak will cause all the symptons described above but unless you have a MAJOR & I MEAN MAJOR vacum leak it is usually of no concern at cruise rpms. [/QUOTE]
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Welcome to SportTrac.Org
Off Topic Discussion
Help!! Changed parts and not fixed!!
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