Question about 2005 Pontiac Aztek

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A deep droning noise from the back.They say it isn`t an exhaust problem I`ve replaced the muffler and tailpipe.It is still there.It does sound like an exhaust problem though.

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  • lmazzae Feb 04, 2010

    IThe car is quite if I`m not pushing down too hard on the excellerator

  • lmazzae Feb 04, 2010

    When I`m pressing harder on the excelerator it gets louder.If not its pretty quiet.

  • frank thomas wilson
    frank thomas wilson May 11, 2010

    droning noise? can you elabrolate in a better form of wording?

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Have someone check your rear wheel bearings

Posted on Feb 04, 2010

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1 Answer

What exactly is muffler drone?


an un baffled exhaust noise
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Water WILL drip from a holed silencer or pipe. This is normal. The water isn't your problem - you have a hole or split in the muffler or pipe

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Easy is a relative term. If you can get the remainder of the tailpipe off from the muffler, replacing the tailpipe alone wont be so bad. If it's in there so bad that it will take all day to remove, I would recommend replacing the exhaust from the cat back because it will end up being faster and easier. If you plan to keep the vehicle for any length of time, specifically ask for walker exhaust components; AP mufflers and pipes are a little cheaper but wont last.

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I have a 1997 chevy cavalier 2.2L 4Cylnder, and it is making a radling noise, we thought it was the water pump so we replaced it and found out that wasn't the problem so I looked closer, I went under neath...


Sounds are one of the hardest things to figure out without hearing them. Check to see if the exhaust system is hanging lower than it should, if it is it maybe hitting something as you drive and has probably broken a hanger which a muffler shop can fix for you. Also you can check to see if it is an exhaust leak by cupping your hand making a seal over the tailpipe with the vehicle running. Do this check right after the car has been started, be careful not to hold the pipe or burn yourself sometimes a rag in your hand can be helpful. If there is pressure against your hand your exhaust should not have any leaks on the other hand if there is a leak the noise you hear should change and there maybe suction on your hand. Suction=Leak Pressure blowing away from the tailpipe=no Leaks

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Rattling sound from the exhaust


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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Is$175.00 for one flowmaster super 44 series muffler too much?


Heres the bottom line...My dad used to tell me that nothing is worth more than you are wiling to pay for it.
What you now have is a mix of unmatched components that sound nice, and possibly may give you a one or two mpg increase. However, a good exhaust system is carefully engineered to take advantage of sonic as well as physical, laws that influence the way both sound and air (exhaust) behave in certain diameter pipes, when traveling at pre-determined speeds.
Most stock exhaust is far from that, rather, it is the cheapest easiest means to permit exhaust to escape from the engine while making the least amount of noise, while keeping the converter operating. Therefore anything you do to lower pressure will give you somewhat of a performance gain. In using a part of the stock system, you cancel some of that gain by creating another restriction. I'd be satisfied with what you have but would be concerned about passing a state inspection. If you want to learn more about exhaust and how it influences your engine there are many good books you can read on this subject. (I know that because I probably read them all as a pro racer).
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Lack of power


If the catalytic converter disintegrated before you replaced it, the muffler may have been clogged by chunks of ceramic falling from the cat and migrating back to the muffler.
Try this: drive the car warm, then stop and with a helper to gradually raise the RPMs while standing, listen at the tailpipe. If you clearly hear the individual firing of the engine then the system is probably clear. If you notice that the sound is more of a hiss, then either the muffler or (if it has one) the resonator are clogged.
On a car with a heavy-gauge stainless exhaust system, two shots from a .357 magnum into the tailpipe opened it up again (forever) and didn't really make much difference in the loudness of the exhaust. I wouldn't recommend doing that with most exhaust systems though.  
    

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