Recently I started to hear a loud noise by the engine from the exhaust pipe I do not see any loose or broken pipe, a friend told me that it might be due to the humidity, where I live the snow was about 40 inches high and I had to go out every day so I was driving over the snow four-six times every day will this noise go away by itself or do I have to do something ? Thanks,
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Knocks ---big ends or main bearings rattles-----tappets worn or loose or hydraulics leaking down too fast Tinny noise ----water pump bearing , fan hub. Sharp release of air noise --- broken exhaust pipe for starters Take your pick
2008 GMC Envoy is only equipped with one of two engines: 4.2L (254") 6-Cylinder SFI 5.3L (325") V-8 SFI
Niether of these engines are equipped with an EGR valve, so I guess the probability of that being the cause of your noise is pretty much zero to none.
If you believe the noise is being caused by the exhaust ststem, then the only way to verify that is to inspect the exhaust system. Leaks are easier to verify with the engine running.
With that said, there is also a Technical Service Bulletin (TSB) that is published by GM that addresses customer complaints about loud noise that is being caused by the electro-viscous engine cooling fan clutch. Some people describe it as exhaust noise and others describe it as the engine "racing" or "roaring".(even though the tachometer (if equipped) will be reading normal)
It basicly says that it can make noise on startup due to high rpm of the fan which goes away once the electric solenoids open and allow the fan to start free-wheeling. GM says this is normal operation. You might want to check to be sure this is not what you are hearing. (it can be pretty loud)
the tubes i think your talking about have to do with emissions that supply fresh air to the exhaust for those cylinders when required.if they break off you will get an exhaust noise which is what your hearing.there are only 2 ways to fix this.one is to repair/replace the damaged pipe or remove the pipes and plug the system off.be aware if you do the last it will fail an emissions test and have to be replaced to pass anyways.
which pipe, i assume you are referring to an exhaust pipe, do u have a loud (more than usual) exhaust sound, if so, the exhaust pipe is cracked or split, if not, then the exhaust hangers (mahe of heavy duty rubber) are split/broken, causing it to shake OR is the engine shaking as well, or just the exhaust, too many questions, need to specify
This seems to be a classic case of "disentegrating exhaust system syndrome." There is either a hole(s) somewhere in your exhaust system or there is a leak somewhere. Probably the easiest way to tell where the noise is coming from is to start your car and just listen around in the engine bay, under the car, and at the muffler. Also do a visual inspection of the exhaust system to see if you can see any holes in the piping. I have also seen hairline cracks in the exhaust header itself that can cause the loud ticking noise that can be a little tricky to track down.