Humming noise

Reply

  #1  
Old 11-19-16, 02:41 PM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Humming noise

I have a 2000 Chrysler Town & Country with 190000 miles on it. Just last week it developed a strange humming noise that I can't locate. One might even call it a low roar, but not an exhaust roar. At first I thought it might be the idler pulley, but now I don't know. It begins when I start the engine and does not seem to be affected by the engine speed. When walking around the vehicle it changes and seems most noticeable when standing outside the passenger front door, not in engine compartment or when hood is raised. I had the fuel pump replaced a couple weeks before it began, but the noise never happens with just the ignition on. Engine must be running, and before any fan starts.
 
Sponsored Links
  #2  
Old 11-19-16, 05:30 PM
ukrbyk's Avatar
Member
Join Date: Mar 2010
Location: USA/ Pacific NW
Posts: 3,222
Exhaust leak from somewhere underneath the car.
 
  #3  
Old 11-19-16, 05:47 PM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Thx, I'll give it a good look.
 
  #4  
Old 11-20-16, 07:11 AM
ukrbyk's Avatar
Member
Join Date: Mar 2010
Location: USA/ Pacific NW
Posts: 3,222
Reminded me of humm in my then Silverado. It was right below my seat and back. Irrelevant to engine RPM or speed. Hummmmmmmmmmmm. Drove me nuts, I looked for it countless times - never figured WDF it was. The only thing there was transfer case and exhaust pipe and they all looked well. Maybe it is transmission pump? They are said to have some sort of ATF pump inside, I believe.

Ok, do you have inline or transverse engine? And you say - noise is NOT coming from engine compartment with hood open? That pretty much takes engine pulleys and such out of consideration besides they will change pitch with RPM. Hum is something either blowing very fast or spinning at high RPM and this is why I ask - which way is your engine pointing?
Under pass seat, unless it's 4WD, you have possibly only exhaust.
 
  #5  
Old 11-21-16, 05:46 AM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Engine is transverse with exhaust outlet and transmission on driver's side. However, it seem I can hear noise better outside car on passenger side. Noise is very deceptive. Haven't had a chance to check out exhaust system.
 
  #6  
Old 11-21-16, 07:11 AM
pugsl's Avatar
Forum Topic Moderator
Join Date: Mar 2008
Location: Raleigh, NC
Posts: 7,739
When I was wrench turning noises can be very hard to trace. Have had noise everybody said was right front and it came from back of car.
 
  #7  
Old 11-21-16, 07:58 AM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Understood. Had an idler pulley go out one time and it was a rattle, not a bearing type noise and sounded like one side of engine, but was on other side. Haven't been able to get back to it yet.
 
  #8  
Old 11-21-16, 10:17 AM
Join Date: Jan 2007
Location: North Central Indiana
Posts: 905
Spray something in the throttle body to make engine smoke then look for leaks in ex.
 
  #9  
Old 11-21-16, 04:40 PM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Good idea. What would be a good item for creating smoke?
 
  #10  
Old 11-21-16, 07:52 PM
ukrbyk's Avatar
Member
Join Date: Mar 2010
Location: USA/ Pacific NW
Posts: 3,222
Military grade? Seafoam.*****************
 
  #11  
Old 11-22-16, 04:26 PM
Member
Thread Starter
Join Date: Jul 2003
Location: USA
Posts: 128
Turned out to be the fuel pump that had been installed several weeks ago. Thanks for your suggestions.
 
  #12  
Old 11-23-16, 02:26 PM
ukrbyk's Avatar
Member
Join Date: Mar 2010
Location: USA/ Pacific NW
Posts: 3,222
Never realized fuel pump is that much to the front of the engine. Now you know how deceiving the noise origin can be on a vehicle. It's one large metal resonator box.
 
Reply

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
'