Whistling noise in 392 Shaker Hemi - Dodge Challenger Forum: Challenger & SRT8 Forums
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 12-10-2018, 05:55 PM Thread Starter
Junior Member
 
Rdbegley's Avatar
 
Join Date: Dec 2018
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
(Thread Starter)
Whistling noise in 392 Shaker Hemi

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
Rdbegley is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 12-10-2018, 06:48 PM
Super Moderator
 
Hal H's Avatar
 
Join Date: Aug 2008
Location: Lowell NC
Posts: 14,171
Thanks: 21
Thanked 3,292 Times in 2,517 Posts
Garage
Feedback Score: 0 reviews
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.

2016 392 Hemi Scat Pack Shaker 23Y pkg (M6) ordered 8/28/15, born 10/23/15, home 11/20/15
Torred / Black/ Ruby Red leather
2009 R/T 27J pkg (M6) ordered 7/17/08, born 10/23/08, home 11/13/08
Hemi Orange / Dark Slate/Light Slate Gray leather
-Sold 9/1/15

Last edited by Hal H; 12-10-2018 at 06:54 PM.
Hal H is offline  
post #3 of 7 (permalink) Old 12-10-2018, 10:22 PM
Member
 
PlumChallenger's Avatar
 
Join Date: Aug 2018
Posts: 99
Thanks: 13
Thanked 29 Times in 19 Posts
Feedback Score: 0 reviews
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.
PlumChallenger is offline  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 12-10-2018, 11:00 PM
Super Moderator
 
A Guy's Avatar
 
Join Date: May 2016
Location: Bay Area
Posts: 10,383
Thanks: 2,210
Thanked 3,422 Times in 2,617 Posts
Garage
Feedback Score: 0 reviews
Poor mans whistle finder

Click image for larger version

Name:	download.jpg
Views:	10
Size:	3.0 KB
ID:	935405

A Guy


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


2016 SXT Plus Pitch Black Blacktop Package. Eibach Pro lowering springs. Solo cat back exhaust. Paint and wheels coated w/ CQuartz Finest. DLux on all plastic.
A Guy is offline  
post #5 of 7 (permalink) Old 12-11-2018, 04:39 AM Thread Starter
Junior Member
 
Rdbegley's Avatar
 
Join Date: Dec 2018
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
(Thread Starter)
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
Rdbegley is offline  
post #6 of 7 (permalink) Old 12-11-2018, 05:58 AM
Super Moderator
 
Hal H's Avatar
 
Join Date: Aug 2008
Location: Lowell NC
Posts: 14,171
Thanks: 21
Thanked 3,292 Times in 2,517 Posts
Garage
Feedback Score: 0 reviews
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.
Hal H is offline  
post #7 of 7 (permalink) Old 12-12-2018, 03:26 PM
Senior Member
 
DodgeCares's Avatar
 
Join Date: Apr 2012
Location: MI
Posts: 1,300
Thanks: 159
Thanked 389 Times in 227 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by Rdbegley View Post
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
Quote:
Originally Posted by Rdbegley View Post
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
DodgeCares is online now  
Sponsored Links
Advertisement
 
Reply

  Dodge Challenger Forum: Challenger & SRT8 Forums > General, Performance, and Technical > General Challenger Discussion > Challenger Issues & Problems

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Challenger Forum: Challenger & SRT8 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome