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Old 04-20-2011, 01:55 PM   #1
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Droning Rattle Right After Starting?

I notice that after I start my TJ, it begins to make a low droning noise. You can hear it is coming from underneath but I have no idea what it is. Does anyone think they could have an answer?

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Old 04-20-2011, 02:32 PM   #2
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What jeep do you have?

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Old 04-20-2011, 04:11 PM   #3
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I have a similar sound, my catalytic converter has taken a dive. Get under the Jeep and kinda hit/shake the cat and see if you hear any rattling.
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Old 04-20-2011, 05:23 PM   #4
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99 TJ Sport 4.0. And I'm going to start
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Old 04-20-2011, 05:29 PM   #5
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Yep, I'd guess it's the cat going....
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Old 04-20-2011, 06:29 PM   #6
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I have that exact same problem. I've narrowed it down to the tail pipe. And the only time it goes away is if I turn off the engine. I've been told that is what engines do, they make noise - but i'm not sold on the thought..


But on a serious note. Check clearances the whole way through. Have you put on any high clearance skids lately or anything else that would have moved the transfer case area up or down at all? Make sure nothing is hitting the heat shields.
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Old 04-21-2011, 05:42 PM   #7
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i don't do much. i keep it stock as my DD to the High School so I don't change anything

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