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2004 Dodge RAM, 1500 SLT, 4x4, 5.7L Hemi, 110,000 miles

I have a strange chirping / squeaking sound - coming from the engine compartment. The noise occurs even with the serpentine belt removed, so I have eliminated all of those items as potential culprits.

It also occurs while the vehicle is not in motion, eliminating driveline related issues. Here is what I have observed:

1) Mainly occurs when depressing the gas pedal - just slightly up to around 3K RPM's.
2) It seems to occur in Park, but is definitely more noticeable in Drive or Reverse - I basically apply the emergency brake and slightly rev the engine and the noise occurs - having the brake engaged keeps the vehicle stationary. It will also make the noise if in motion as well, but originally kept the vehicle immobile to eliminate driveline issue such as wheel bearings, u-joints, etc, from the puzzle.
3) The sound fades after a couple of minutes - once things warm up for just a couple of minutes (literally - about 2 mins or less), the noise fades away. It is more noticeable in the AM when the engine is cold, but letting it sit for just 5 or 10 minutes will cause the noise to re-occur upon startup, even if the engine hasn't cooled down.. so, probably not so much a cold engine, but the sound goes away once it has been running for about 2 minutes.

I tried running with the oil fill cap off and checked the PCV valve - no apparent issues there. I do have a couple of broken studs for the exhaust manifold on the passenger side (heat shield loose), but I don't think even an exhaust leak would cause this type of noise / symptom - usually exhaust is more of a tick, not a squeak / chirp that behaves like this.

Being its louder in drive / reverse, I am thinking possibly something with the tranny / TC???

all fluids are topped off and clean - oil looks great, transmission fluid looks clean. Vehicle has been well maintained. This particular issue came on rather suddenly. Originally, I thought the sound was something driven by the serp belt - it sounds just like that. However, removing the serp belt and having the noise continue ruled any of those items out. As a reference, it does sound like a belt or power steering pump squeak. And again, only occurs while depressing the accelerator...at normal idle it's quiet.

Thoughts or suggestions would be appreciated - not sure what to start looking at now... I have no issue taking it to the dealer or another shop, but want a good idea as to what may be going on first - don't want some shop selling me the London bridge. Other than the noise, which quickly disappears, the vehicle runs beautiful. I'm just concerned something serious and expensive is in the early stages of failing!
 

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Have you checked the ac fan? It typically runs for a couple mins on start up and is the only moving part that has a squeak potential not asociated with pulleys that I can think of. I'd stethoscope the harmonic balancer and the ac fan first. At the very least you can know for sure what it isn't.
 

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Sometimes the switch on the back of the gas petal can develop a chirp in it. Try shutting the truck off and just push the throttle with your hand.
 

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Heat shield noise

I had the same thing and found out it was the manifold heat shield on the right side of the motor. Seems the heat shield had rotted off the back 2 bolts. My question is do I have to replace the heat shield or just remove it and run with out it?
 

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2004 Dodge RAM, 1500 SLT, 4x4, 5.7L Hemi, 110,000 miles

I have a strange chirping / squeaking sound - coming from the engine compartment. The noise occurs even with the serpentine belt removed, so I have eliminated all of those items as potential culprits.

It also occurs while the vehicle is not in motion, eliminating driveline related issues. Here is what I have observed:

1) Mainly occurs when depressing the gas pedal - just slightly up to around 3K RPM's.
2) It seems to occur in Park, but is definitely more noticeable in Drive or Reverse - I basically apply the emergency brake and slightly rev the engine and the noise occurs - having the brake engaged keeps the vehicle stationary. It will also make the noise if in motion as well, but originally kept the vehicle immobile to eliminate driveline issue such as wheel bearings, u-joints, etc, from the puzzle.
3) The sound fades after a couple of minutes - once things warm up for just a couple of minutes (literally - about 2 mins or less), the noise fades away. It is more noticeable in the AM when the engine is cold, but letting it sit for just 5 or 10 minutes will cause the noise to re-occur upon startup, even if the engine hasn't cooled down.. so, probably not so much a cold engine, but the sound goes away once it has been running for about 2 minutes.

I tried running with the oil fill cap off and checked the PCV valve - no apparent issues there. I do have a couple of broken studs for the exhaust manifold on the passenger side (heat shield loose), but I don't think even an exhaust leak would cause this type of noise / symptom - usually exhaust is more of a tick, not a squeak / chirp that behaves like this.

Being its louder in drive / reverse, I am thinking possibly something with the tranny / TC???

all fluids are topped off and clean - oil looks great, transmission fluid looks clean. Vehicle has been well maintained. This particular issue came on rather suddenly. Originally, I thought the sound was something driven by the serp belt - it sounds just like that. However, removing the serp belt and having the noise continue ruled any of those items out. As a reference, it does sound like a belt or power steering pump squeak. And again, only occurs while depressing the accelerator...at normal idle it's quiet.

Thoughts or suggestions would be appreciated - not sure what to start looking at now... I have no issue taking it to the dealer or another shop, but want a good idea as to what may be going on first - don't want some shop selling me the London bridge. Other than the noise, which quickly disappears, the vehicle runs beautiful. I'm just concerned something serious and expensive is in the early stages of failing!
I have a new 2020 that chirps. I found the shifting cable positioner is rubbing the front drive shaft. Taking it to the dealer tomorrow for a fix. I will let you know if it works.
 
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