Question about 2007 Pontiac Grand Prix GXP Sedan
2000 Pontiac Grand Prix 2 dr. w/ supercharger Loud chinging/rattling noise from under neath Meineke replaced flex motor pipe? which included the catalytic converter after a week the noise started again the people at meineke said they couldnt find anything wrong. the noise is not all the time. only when accelerating or if I've been at a red light or stop sign you can hear it as I pull off. It kind of sounds like a metal noise like metal sliding across metal or vibrating.
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!
Posted on Sep 24, 2009
Have the knock sensor check and run 93 octane full tank and see if that noise goes away.
Posted on Sep 24, 2009
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Posted on Jan 02, 2017
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