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I have an 2018 392 Scat Pack Hemi and after the first oil change at 3,000 miles, I am hearing a whistling noise while idling. Don’t hear it when I rev it up, only at idle. It’s getting annoying but the Dodge dealer that looked at it said that the shaker hoods are prone to make air noises. This isn’t a normal low air noise, it’s a high pitch whistle that others can also hear outside of the car. Anyone else have this problem and surely it can be fixed, it’s kinda embarrassing to have a hot rod that is whistling
 

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that sounds like a vacuum leak.

Might want to see if the tube to throttle body is secure.

Another item might be if throttle body to manifold is secure.

The other steps:

(this would require removing the shaker scoop and the base plate)

check the 10 manifold bolts to see if any are loose / need tightening (they only require 105 in.lb. of torque)

a remote possibility is if an injector seal to the runner is leaking vacuum

one other area to investigate - the vacuum hose from rear of intake to power brake booster. If there's any damage to the hose or possibly the connector that is attached to the booster unit...

The Shakers will have a whistle under acceleration (you'd hear with window open), but that's about it.
 

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It does sound like a vac leak.

The variable is the oil was changed and then the noise started.

Shaker assembly gets removed I believe for oil service, so reverse engineer it and look for a loose hose, seal, etc. that would get removed or knocked off when changing the oil.

R&R shaker assembly

Use a stethoscope to pinpoint the noise maker if needed. Take the probe tip off and point the hoses around until the leak gets loud.
 

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Poor mans whistle finder

download.jpg

A Guy
 

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Discussion Starter #5
The mechanic took the shaker off and said he checked the seals and also greased the seals but couldn’t find any reason why it was whistling. I’ll see if I can’t find someone else to check it again at Dodge since it’s under warranty and I’m not happy. Thanks for y’alls suggestions
 

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as @PlumChallenger mentions, using a stethoscope (versions are made for tracing engine noises) - while the engine is running to trace down the location of the whistle / sound will narrow down what to look for.

The other item I forgot to mention in the prior post is whether the PCV system has a leak. This wouldn't have been an item involved with the oil change (the shaker base plate covers this up, normally base plate isn't removed for oil change service...).

another item to check is the MAP sensor (rear of intake) if that O-ring seal has a leak

From what you describe, its an item that has a constant high vacuum source at idle, and that points to a vacuum leak somewhere.

Today's cars don't have the myriad vacuum lines we used to see on the 70s/80s/90s engines, so there's fewer items to trace down.

You used to have vacuum lines for:
air diverter valves [A.I.R. pumps]
distributor timing vacuum advance
EGR valves
HVAC dampers
exhaust heat valve / crossovers
thermostatic air cleaner heat control
coolant over temperature valves
MAP / BARO sensors
turbocharger waste gates


and so forth. There was a lot of "spaghetti" under the hood and the fittings or hoses would deteriorate and leak. The computer controls eliminated a lot of vacuum / mechanical system that used to be in many applications.
 

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I have an 2018 392 Scat Pack Hemi and after the first oil change at 3,000 miles, I am hearing a whistling noise while idling. Don’t hear it when I rev it up, only at idle. It’s getting annoying but the Dodge dealer that looked at it said that the shaker hoods are prone to make air noises. This isn’t a normal low air noise, it’s a high pitch whistle that others can also hear outside of the car. Anyone else have this problem and surely it can be fixed, it’s kinda embarrassing to have a hot rod that is whistling
The mechanic took the shaker off and said he checked the seals and also greased the seals but couldn’t find any reason why it was whistling. I’ll see if I can’t find someone else to check it again at Dodge since it’s under warranty and I’m not happy. Thanks for y’alls suggestions
Hi Rdbegley,
We understand why this may be concerning. We would be happy to have a case escalated for you so a Case Specialist can work with your dealer to help find a potential solution to this. If you are interested, just send us a private message!
Lydia
Dodge Social Care Specialist
 

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Discussion Starter #8
Sorry I forgot to tell what the whistling noise was. It was my water pump fixing to go out. It’s been replaced and since the replacement, no more whistling. Hopefully this helps someone who has the same strange noise bc I would have never guessed it would be the water pump on a brand new car!
 

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Sorry I forgot to tell what the whistling noise was. It was my water pump fixing to go out. It’s been replaced and since the replacement, no more whistling. Hopefully this helps someone who has the same strange noise bc I would have never guessed it would be the water pump on a brand new car!

Can't blame you for not guessing it was the water pump. After all " Dodge dealer that looked at it said that the shaker hoods are prone to make air noises."


On a more serious note a water pump (or really anything) can go bad at anytime. Don't lose any sleep over this but just use it to remind yourself to get a strange noise investigated. 'course, when it is diagnosed as apparently normal from a shaker hood rather than a water pump....
 

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I was going to ask if you were listening to GNR Patience


Or Scorpions Wind Of Change


A Guy :)
 
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