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1995 Jeep Cherokee Question: In take manifold

 

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bike, 4.0L 6 Cylinder, Carol Stream, IL, May 19, 2009, 22:54
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If the intake manifold is not tighten correctly, would this cause the exhaust manifold to turn red hot. Would it also cause the engine to run at a high rpm.

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, May 21, 2009, 00:11
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    An intake manifold that is incorrectly tightened and allows air to be drawn in past the intake manifold gasket (causes a vacuum leak can give a high or erratic /surging idle speed and cause a misfire. If the vacuum leak is so severe that it causes the engine to run "lean" the exhaust manifold could get red hot in theory and power would suffer.

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  • Answer #2

    dandd May 21, 2009, 18:33
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    It would also send fresh air to the Oxygen sensor which would make the computer set the mixture to full rich would would heat up the manifold, even to a reddish color.

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