It would depend on what part is making the loud noise. We are going to need more info.
your engine is loud because, the fan makes that noise
If the 1999 Suburban noise is a sort of loud banging noise, the problem could be that the engine have jumped time. Jumping time would cause the noise and jerking in the engine.
The fuel in the cylinders exploding
i have a very loud tapping noise in my BMW 318i e36 1993 engine. its extremly loud on start up then drops down to very loud when idling. the noise never goes away. I've had people say the engine was about to throw a piston, i need a new engine, etc what could it be and is it possible to fix?
As the engine revolutions increase, so does the noise from the engine as it is working harder as opposed to being still idling. Also, could be a leak in your exhaust system that could be the cause of the additional noise.
Leaking exhaust possibly, Loose belts, burnt bearing on an accessory.
Muffler
You have to locate the source of the noise then repost your findings.
Loud engine noise is usually a result of a hole or disconnection in the exhaust manifold or muffler.
Stuck hydraulic lifter.
Because the loud brum brum engine! Make sure if your a child you hold your baby ears!
it doesn't.More accurate answerThe engine will very quickly: Start rattlingStart a loud knockingIt may make a loud squeak noise and stopIt may make a loud bang noise and stop