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Throaty Sound from engine bay

tim5779

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tim5779 Enthusiast

tim5779

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10 minutes ago, ftwhite said:

Can you reproduce the sound parked and revving the engine? Or only in drive and at speed?

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Ah good question!  It does not make the sound in park while revving.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
Ah good question!  It does not make the sound in park while revving.

I’ll do a shot in the dark. Small exhaust leak that seals quick. You don’t hear it at idle because it needs a little load? Seals quick do to heat expansion. I’ve seen weirder things.

 

 

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L86 All Terrain Senior Enthusiast

L86 All Terrain

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You hear it at low RPM no matter what, or only when the engine is under load (accelerating hard at low RPM without dropping down a gear, aka lugging the engine)? If you are putting the engine under load at low RPM's you can hear a little engine noise even with the stock intake as the motor sucks in air, with a CAI the sound is much louder and more profound. The intake looks like a giant cooler lid with random baffles and a closed air box, this is to minimize intake noise. I personally like to run a CAI because I love the throaty growl they make as they suck air in through an open box and right into the intake without having to navigate that stupid looking piece attached to the throttle body. I prefer to do intakes over mufflers because it is only loud under load, when you want it to be where as the wrong muffler makes noise or drone all the time any you can never have a peaceful drive when you want one.

tim5779 Enthusiast

tim5779

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48 minutes ago, L86 All Terrain said:

You hear it at low RPM no matter what, or only when the engine is under load (accelerating hard at low RPM without dropping down a gear, aka lugging the engine)? If you are putting the engine under load at low RPM's you can hear a little engine noise even with the stock intake as the motor sucks in air, with a CAI the sound is much louder and more profound. The intake looks like a giant cooler lid with random baffles and a closed air box, this is to minimize intake noise. I personally like to run a CAI because I love the throaty growl they make as they suck air in through an open box and right into the intake without having to navigate that stupid looking piece attached to the throttle body. I prefer to do intakes over mufflers because it is only loud under load, when you want it to be where as the wrong muffler makes noise or drone all the time any you can never have a peaceful drive when you want one.

I went with a Borla muffler, left the resonator and flapper on, and I love the sound.  You can only hear it inside the truck on a cold start.  Otherwise, it sounds stock unless you're standing outside.  I put an AEM dry filter in and I just ordered the Airaid M.I.T.  I'm thinking that paired with my muffler should sound pretty good, and I'm hoping the M.I.T gets rid of this stupid sound.  It's definitely a "baffled drone" type sound.  That's why I think it's coming from the intake (the big ugly @ss cooler lid you described).

ftwhite Enthusiast

ftwhite

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If it doesn't make the noise, except when moving, I would bet it is either torque converter, transfer case/diff, or hubs. An exhaust leak, I assume, would leak as much in park at 2k RPM as in drive at 2k RPM. Same for an air intake problem source. Good luck with narrowing it down.

tim5779 Enthusiast

tim5779

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No...it's really hard to explain.  It has nothing to do with a mechanical malfunction.  It's just the natural sound of the engine, and as I've said, I'm probably only noticing it because I'm coming from a RAM.  You guys are probably immune to this engine sound because you've always driven Chevy's.

 

tim5779 Enthusiast

tim5779

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11 hours ago, DirtyAndy said:

That’s the sound of American V8 glory. Revel in it and enjoy.

After a ton of research I've gathered that its the sound of "natural aspiration". Which my RAM did not have.  So that explains why it stands out to me and not other Chevy loyalists.  But still, wouldnt trade this truck for a RAM any day.  That truck was a POS and in and out of the shop from the day I bought it.  In truth, I'm a Tundra loyalist, but I wont go back to Toyota until they do something about their gas mileage.  I'm sure I'll catch alot of flack for that comment, but I have a video of my Tundra half ton tied up to a Chevy 2500 and pulling it 100 ft.  Tundras are tough @ss trucks!!!

mferry22 Enthusiast

mferry22

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Is your noise most noticeable on the driver side of your truck. I have a noise that sounds like gurgling or an exhaust leak that only happens under light load. The range device didn't fix it, it's not the flapper valve or bad gas. I think its either the vacuum pump or the steering shaft boot from some of the threads on this forum. I've brought it to the dealer 3 times and they can't figure it out. I will be bringing it back one more time to mention those two things and see it I can get it resolved. 

  • 1 month later...
mferry22 Enthusiast

mferry22

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Posted

So I finally got to the dealership about this noise and it is finally fixed. They replaced the vacuum pump and the steering shaft boot and the noise is gone. I am sooo happy, I will be keeping my truck for awhile now. 

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