What causes loud exhaust noise - Rinnai Toyostove Direct Vent Heater: Laser 30 Toyostove Direct Vent Heater Shipping

1. Loose or worn wheel bearings: This can cause a loud, rumbling sound that increases with speed.
2. Engine problems: A roaring sound could be caused by a problem with the engine, such as a failing alternator or a damaged serpentine belt.
3. Exhaust problems: A roaring noise could indicate a problem with the muffler, exhaust pipe, or catalytic converter.
4. Drivetrain problems: Issues with the drive shaft or CV joints can also cause a roaring noise while driving.

It's best to have a mechanic inspect the vehicle to diagnose the issue and recommend the proper repairs. Driving with a loud noise could indicate a more serious problem and could cause further damage if not addressed promptly.

It’s difficult to say because engines make a wide variety of noises.
Rattling, possibly a worn timing chain.
Misfiring, possibly incorrect valve timing or damaged head gasket.
Metallic scraping, possibly a lack of oil pressure causing bearing to run dry.
Knocking, possibly worn mains or big end bearings.
Loud exhaust noise, possibly a blown exhaust manifold gasket.

There are a wide variety of possible noises and therefore a wide variety of possible causes

I suggest you have your car checked as soon as possible - while a rattling exhaust isn't desperately urgent it could be the cat breaking up which might later restrict the flow of gases. Most importantly excessively loose timing belts or chains tend to make most noise when the engine is idling. If the noise is being caused by this delay could be very expensive.

First thing to check is the exhaust system.

Hi
Loud noise from Exhaust means your exhaust system is leaking.
this will make the performance poor on your vehicle.

Get that check and replaced.

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)

lous engine noise can be casued by several things let me clarify sources to you and you can try to fidn the real reason

1- improperly adjusted timing belt/chain cause your engine run on wrong ignition timing. so this cause of pinging. this cause pinging noise and this is a cause of noise in engines.
2- manifold gasket is leaking
3- exhaust manifold or exhaust is cracked.
4- intake rasonator is not attached to air filter housing and cant neutralize the rasonance casued by air vacuumed inside engine while engine is "breathing"
5-valves are out of adjustment if they are manually adjustable
6-related to valves- be sure that engine oil is in right viscosity (like 10w40 5w30 check the users manual) and engine oil is filled at correct level.

have your wheel bearings checked sounds like bearing noise to me or exhaust problems

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

have the exhaust checked for leaks, a hole in the exhaust or broken pipe will cause a loud engine sound, also is the check engine light on?