Question about 2001 Chevrolet Tahoe

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Metal rattling/knocking inside passenger exhuast

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Could be your catalytic converter. When they are no good sometimes the stuff on the inside breaks apart and rattles around and makes noise.

Posted on Feb 11, 2012

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The metal shielding around your catalytic converter could be rattling or the rubber donut that holds the rear tailpipe could be bad. When your car is cold shake your tailpipe and see if you can reproduce the noise. If you can your tailpipe donut is likely bad. Three dollars at any auto parts store. If it does rattle when you shake your tailpipe then the heat shield for your convert could be loose. You need to tighten it up another piece of metal between it and the converter to keep it from rattling. If you hear the rattle when you go over bumps too then your exhuast is probably, loose. Crawl under there and stake shaking things, I am sure you'll find the problem

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Hello! First of all, congrats on owning a great car! That engine (3.8L Series II L67) is without a doubt one of the finest GM (Buick) has ever produced!

On to your problem - I think you have one of 2 things wrong:

1) a loose heat shield
2) a broken exhaust hanger

Both of these will cause intermittent (and highly annoying) rattling sounds, especially at low speeds or when the engine is under load (like going up a hill for instance). There are 2 hangers under the car located almost directly under the front floorboard. These are prone to breakage. There is also a heat shield in this same area - that is very prone to coming loose. If it's the heat shield - you can either remove it - or have it tack welded. If the hanger(s) are broken, you will need to take it to an exhaust shop (unless you know a welder :) ) and have those fixed - shouldn't cost you more than $20 either way.

Hope this helps and good luck!

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Could be that your Heater fan is wearing out,,,or maybe something has fallen into the defrost vents and is rattling.
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HI...
Depend of the year and size of ENGINE.
I can tellyou the location. of the KNOCK sensor.

I WILL be waiting.

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