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Old 01-18-2012, 07:11 PM   #1
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sounds like a diesel engine

so i have an 87 yj 4.2L inline 6 and it sounds like a diesel engine??? Is that normal sometimes or i got an issue?

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Old 01-18-2012, 08:42 PM   #2
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I should shound like an old six cyl. Ford.

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Old 01-18-2012, 10:00 PM   #3
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Sounds like u might have an exhaust manifold leak either a crack or bolts are not tight
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Old 01-18-2012, 10:03 PM   #4
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hard to say without hearing it, most likely exhaust manifold gasket failure..
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Old 01-19-2012, 09:18 AM   #5
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my 94 4.0 has had that diesely sound since ive had it, my buddys TJ 4.0 same thing, My GF old 89 YJ same thing, ive just come to know it as normal
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Old 01-19-2012, 11:07 AM   #6
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I agree with Jeepin94YJ and locked ... probably an exhaust manifold leak. It probably sounds like it's gasping for air, making it sound like a loud diesel. My brother had the same issue with his TJ.

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