Loud noise appears to be coming from the engine

It sounds as if the mounts or trans/engine mounting hardware is becoming loose...Unless the engine is out of timing and running rough ....Take it to the tech that repaired the mounts and have them inspect their work.......

Sorry... Year63chante,

When somebody say GARBAGE Truck... I immediately
think RING & PINION gears (should be speed sensitive
((if you have any oil in there... Lets hope)).

Probably the most common cause for loud engine noise
are BEARINGS... or LOW POWER STEERING FLUID...

Many serious Old time "MECHANICS" really do use
various tools, screw drivers, extensions & sticks ...
As listening devices... Problem is... They are inherently
UNSAFE...
If you accidentally stick that long EXENSION into your
FAN... it May end up sticking out of that OTHER EAR...!!

PROPER-TOOL: Mechanic's Stethoscope
(safe & inexpensive)
Amazon com Lisle 52500 Mechanic Stethoscope Automotive

ACCELLERATING ...
would seem to indicate drive line or wheel bearings...!!

Power loss... Get your codes read...
Do NOT let the SALES CLERK convince you...
You MUST by new OXYGEN SENSORS... as NEW
OXYGEN SENSORS generally report the same
DTCs (diagnostic trouble code) just as well as the
OLD OXYGENEN Sensors...

Get those codes & come back here...
>>> ((( preferably b at an exhaust shop )))

We can do this (together)

Carnac the Magnificent

Get the engine mounts checked. A bad mount may allow part of the engine to lie on a body or frame part, allowing engine vibrations to become very loud. Torquing of the engine (under load) can cause the same type problems.

More than likely, you have a failed fan clutch. That is a frequent problem on the 4.3 I6 engine. It will cause a roaring noise and "vibration" and allow the engine to overheat at low road speeds. As far as your check engine light and other driveablity problems, it may or may not be associated. Have someone with a code reader check it. The TrailBlazers were infamous for electrical gremlins.

oxygen sensor

I saw exact same problem for few days. Now I see check engine light all the time and engine speed is normal.
The cruise control stopped working. Cruise control sign so nOT light up when I turn it ON. Nor does it works.
But car seems to work fine.

Have your Catalytic converters checked! Sounds like there getting plugged!

Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral.
It sounds like a universal joint in the drive shaft.Do you notice a vibration
along with the noise?

My rio kia bought on from uyi technical dealer in benin city, edo state of nigeria only 4 months ago is vibrating with noise while driving. The noise is noticed by other road users even in motion, making a very loud noise or sound that is highly embarrassing. The dealer mechanics have checked more than twice yet no result, instead the hub bearing is observed; tyres are turn over yet the noise persists.

What do think is resolution to the problem? pls help me. Vinson- [email protected]

Maybe it's the transmission itself. check it.