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Old 09-17-2013, 10:06 AM   #1
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Question weird noise please help! 1994 yj 4.0l

okay so i have a cracked header but im not sure it would make this vacuum like noise here is a link if you listen closely you'll hear the noise that sounds funny

1994 yj with flow masters - YouTube

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Old 09-17-2013, 04:29 PM   #2
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are you talking about the pop pop pop sound when you let off the gas?

If so, thats due to an air leak somewhere in front of the muffler. Could be your cracked header or the pipes are not seated together tight, or the donut gasket is bad.
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