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At 1900 rpm, rhythmic harmonic sound. No vibration, 96, just

Customer Question
at 1900 rpm, rhythmic harmonic...
at 1900 rpm, rhythmic harmonic sound. No vibration
JA: What is the model/year of your Dodge?
Customer: 96
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: just driving it
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 year ago.Category: Dodge
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Answered in 3 minutes by:
10/11/2016
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago
Mike S.
Mike S., ASE Certified Technician
Category: Dodge
Satisfied Customers: 7,772
Experience: ASE certified
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Hi, I am Mike, welcome. I'm reviewing your question.

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Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Does the sound happen in park or neutral, just reving the engine up to 1900 rpm?

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Customer reply replied 1 year ago
Truck has 500k on it. When driving in any gear when approaching 2k rpm. Engine has never been touched, still runs great , minimal oil usage. Could it be piston slap?
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

I don't know yet. If yo are not going to answer my questions, this is going to go nowhere cause I have more to ask, second is, is the noise coming from the engine?

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Customer reply replied 1 year ago
Have not tried it in neutral
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Are you near the vehicle right now?

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Customer reply replied 1 year ago
no
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok, let's go by memory just for now.

Does it sound as though it's coming from the engine?

have you ever reved it up higher than 2000 rpm and if so is the noise still there and if so is it louder?

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Customer reply replied 1 year ago
Only noticed noise this weekend. Have not tried reving it yet. When going down hill and it kicks into a coast state noise goes away. Pretty sure its the motor. Trans has temp guage and not overheating. Just a very rhythmic humming sound
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

I am waiting for an answer?

By the way, it is my opinion that position slap would make a noise standing there under the hood reving the engine up by hand in park/neutral.

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Customer reply replied 1 year ago
I can change noise dynamic by accelerating or decelerating.
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Humming? Does the fuel pump ever make that humming noise when you first turn the key to run before you turn the key to start?

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Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok, never mind, it's not the fuel pump.

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Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Do you have an auto or manual transmission?

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Customer reply replied 1 year ago
old school '96..No electronic crap
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

And what model is this, what engine and is it 4wd or rwd?

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Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

My 1985 has an electric fuel pump.

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Customer reply replied 1 year ago
5.9 L 4x cummins
Customer reply replied 1 year ago
Maybe harmonic balancer? But no vibration just the rhythmic sound
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Ok neither of those is the model, and I suppose the 4x means 4wd, what about the transmission?

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Customer reply replied 1 year ago
Automatic. Dodge Ram 2500
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

I don't know if it's even possible to hear a piston slap on a diesel. I am not a diesel mechanic either.

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Customer reply replied 1 year ago
I read piston slap will give a hollow sound, which it does but that very distinct cyclical hum is troubling. It's not real loud but I hear it. Maybe just a well worn engine sound.?
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

One last question then I will opt out in case you want to talk with a diesel expert. If you feel safe doing so, please practice a few times but on a long stretch of open highway with no one else around, get it up to speed to when the noise occurs, then shift into neutral and listen if the noise is still there or not, if it is, shut the engine off just briefly, then start it back up and listen if the noise went away that little time the engine was shut off.

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Customer reply replied 1 year ago
hold rpm's steady?
Dodge Mechanic: Mike S., ASE Certified Technician replied 1 year ago

No, get it up to speed to where it makes the noise, then let up on the accelerator, then shift into neutral, then shut the engine off, just for a few seconds.

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