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Whine under the hood when accelerating

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  #1  
Old 03-13-2011, 06:26 PM
dodgeramtruck2916 dodgeramtruck2916 is offline
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Default Whine under the hood when accelerating

We have a 2006 1500 Big Horn with the 5.7 HEMI engine, 4x4. Just past 70,000 K and it has developed a very loud whine (not high-pitched) when accelerating at all speeds, and it is sluggish when speeding up. The noise stops as soon as you stop pressing the accelerator pedal. When listening for it with the hood open, it appears to be located dead-center somewhere opposite the fan. I'm not sure if this would be an alternator or transmission problem or maybe something else. The belt appears to be good still. Also, the gas mileage has dropped from 18 down to 14.5 over the past months.

Any ideas of the cause of this problem? Could it be in need of a good tune-up or possibly have an air flow issue?
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  #2  
Old 03-13-2011, 06:38 PM
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water pump or power steering pump my guess
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  #3  
Old 03-13-2011, 06:41 PM
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Welcome aboard!

Whine is often power steering. Alternators whine, too. "Dead center opposite the fan" ... sounds like the rear of the motor?
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Old 03-13-2011, 07:32 PM
dodgeramtruck2916 dodgeramtruck2916 is offline
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I don't think it is power steering or water pump. The whine is not there when the car is idling or when it is turned on, and all gauges are at normal on the dash. There doesn't appear to be any leaks where it is parked and the steering is normal and responsive. It used to "take off" when you just touched the accelerator and now it takes longer to get up to speed. The whine noise almost sounds like air being forced through a crack and it can be heard over the top of the engine roar.
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Old 03-13-2011, 08:43 PM
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What does "Dead center opposite the fan" mean? Whining comes from parts that spin. Could this be a whistle?
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Old 03-14-2011, 09:37 AM
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Welcome to the site. The best thing to do IMO is to pop the hood and get under there and listen. Let a buddy or the wife rev the engine while you listen. If you need to, go buy a mechanics stethescope to help you identify what it is.

At this point it could be anything that rotates which means alt, ac compressor, idle pulley, water pump, ECT
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Old 03-18-2011, 11:51 PM
ilducecorvo88 ilducecorvo88 is offline
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Default Help with same problem?

I have a 2003 1500, 4.7L, 90000 miles. Mine starting making a whining noise after I ran through a huge puddle on the road during a thunderstorm (been a while since this happened). Sounds like bearing squeal, so I changed out the belt, idler and tension pullies, and had the AC compressor pulley changed out. Still makes the damned noise! I have yet to figure out what it is...local dealerships want $700+ to change out the power steering pump, so definitely won't be doing that. There's no play in any of the pulleys i didn't change, and the truck runs fine other than the noise...had a mechanic take a stethoscope to it and that's when i had the AC pulley changed. Noise was still there. Could it be as simple as changing out the Power Steering pulley? Also, you can hear it faintly at idle on mine, but its really loud when giving it any throttle at all. kind of winds down as the rpm's lower too. IRRITATING problem! any ideas????
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Old 03-19-2011, 09:20 AM
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Pulley on the alternator was the source of my truck whine. Take the belt off, or loosen it enough, and turn the pulley, mine sounded like it had gravel in it instead of being smooth when turning. You can probably rebuild replace just the pulley, I replaced the alternator w/ one from the local parts house.
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Old 03-19-2011, 11:53 AM
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I gotta ask, when was the last time you cleaned & inspected your throttle body/intake? Something come loose, not get put back on right? Tune up recently?
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Old 03-23-2011, 10:11 PM
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My whine was the alternator at about 57,000 mile. It occured shortly after I cleaned the engine. Taking a short cut to save some time toasted the bearing.
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Old 03-31-2011, 03:57 PM
ilducecorvo88 ilducecorvo88 is offline
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spent the morning under the hood...loosened the belt and spun every single pulley by hand. no play, no noise. Checked everything i could think of...clamps, bolts, etc. everything's tight. Started it after putting the belt back on, held the throttle open @ about 1000 rpm, there's the noise. Revved up and back to idle, sound stops when it returns to idle. Maybe I just couldn't spin the pulleys fast enough to make the noise??? Any fresh ideas?
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Old 04-20-2011, 05:32 PM
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Mine just started this yesterday! its fishing season so I've been in alot of wet woods roads, driving thru puddles, and I remember driving thru one that was quite deep (at least up to the hubs), drove the truck home, got in it later to go to town and i started hearing the whine. I'll let ya know if I can figure it out!
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Old 05-06-2011, 08:30 PM
dodgerodbrky dodgerodbrky is offline
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Not familiar with all the different models but does your fan have a fan clutch? Just a thought. Sounds like you have tried most everything else. Good luck with it. I hate those kinds of issues as well. Been there done that. Mine just happened to be the lower idler pulley.
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Old 05-07-2011, 07:53 AM
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Sounds like you still haven't zero'd in on where exactly the "whine" is coming from. Def sucks to start replacing parts you're not sure need to be replaced. Long shot here, but have you checked your tranny fluid? A "whine" could be a pump noise in your tans. Check the fluid and make sure the pump's not being starved, or worse, something clogging up things(debris). Get someone to help with the throttle while your under the truck, so you can stick your head right in there.
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Old 05-07-2011, 01:22 PM
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I'd second the suggestion to get a mechanic's stethoscope, they are cheap - and they are indispenable tools for this kind of thing.

In the meantime, you could use a cut-off broom handle to do the same thing, put the flat end against your ear, and the rounded end against your -
  • alternator housing
  • a/c pump housing
  • power steering pump body
  • idler pulley brackets...
But make sure you don't slip and get it driven into your skull - that would kinda suck.
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Old 05-07-2011, 01:37 PM
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talk about strange noises...i have 05 1500 hemi 4x4 with a whole lotta kilometers on it....just replaced the 2 idlers but instead of it screaming like a banshee from hell it now sounds like i have a chorus crickets under the hood..the idlers replaced according to invoice bill were 68058372aa shield and 38058 idler pulley. what else can be causing this very annoying and downright embarrassing noise coming from my baby?
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Old 09-02-2011, 04:18 AM
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Default NOISE from engine during acceleration

Quote:
Originally Posted by ilducecorvo88 View Post
spent the morning under the hood...loosened the belt and spun every single pulley by hand. no play, no noise. Checked everything i could think of...clamps, bolts, etc. everything's tight. Started it after putting the belt back on, held the throttle open @ about 1000 rpm, there's the noise. Revved up and back to idle, sound stops when it returns to idle. Maybe I just couldn't spin the pulleys fast enough to make the noise??? Any fresh ideas?
i too have a noise. i am a retired mechanic. i feel the noise is a vacuume leak on the engine. i will know soon. sounds like a blown plenum gasket under the intake manifold. seems all these engines do this.
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Old 09-02-2011, 04:19 AM
angrykiller1 angrykiller1 is offline
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my last dodge ram had the plenum gasket i found it in the oil pump when i pulled the pan.
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Old 09-02-2011, 06:37 AM
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I vote idler pullies, I just had an issue with mine. Only way I found them was to remove and spin loose, unbolted from the mount. All three bearing were getting dry 160K on them.
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Old 09-02-2011, 09:55 PM
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2nd gens had plenium gaskets issues. 3rd gens.......nope

if you think it is vacuum related then a can of brake or carb cleaner will tell you very quickly
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Old 09-02-2011, 09:55 PM
 
 
 
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