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Thunk In Exhaust


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Posted

Hi all, i have a 2003 Yukon XL with about 126K on the clock. I've been noticing that after turning it off about 10 minutes later there is a fairly loud thunk that comes from the exhaust. It sounds kinda like some just came up and hit it with a bat. It still runs fine and there is no CEL, I'm just wondering what it is. I've never heard until just a few weeks ago, anyone have any idea what it is?

 

TIA

Posted

check the heatshield on the muffler I have read about this topic before and it ended up being the heatshield straps were rusted off and the shield was expanding or contracting ..good luck

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