Funny noise after turning off the truck - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-09-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Funny noise after turning off the truck

Hey guys, I have started to notice this in the last few days. When I shut the truck off it sounds like its relieving pressure, I hope that makes sence. It kinda makes a verrrrrrrr then it gets higher pitched, and stops. It only does it for a few seconds after I shut the truck off.

What the heck is it? I am going up north again this coming weekend and I would like to fix it before I go.

~CB
Reply With Quote
  #2  
Old 04-09-2007
l2en's Avatar
Member
 
Join Date: Dec 2005
Location: The Keystone State
Posts: 4,521
Both of my 03 4.0's made a sucking sound coming from the intake(area) when I turned them off sometimes
Reply With Quote
  #3  
Old 04-09-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Quote:
Originally Posted by l2en
Both of my 03 4.0's made a sucking sound coming from the intake(area) when I turned them off sometimes
Yeah, so what the heck is it? Its driving me nuts, and its kinda embarrassing....
Reply With Quote
  #4  
Old 04-09-2007
l2en's Avatar
Member
 
Join Date: Dec 2005
Location: The Keystone State
Posts: 4,521
Quote:
Originally Posted by greygooseranger
Yeah, so what the heck is it? Its driving me nuts, and its kinda embarrassing....
Just a lil reverse flatulation I guess
Reply With Quote
  #5  
Old 04-09-2007
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
Bob has some technical term for it and explains what it is. Its fine most of our trucks all do it. Depends on the outside temperature and pressure in the air
Reply With Quote
  #6  
Old 04-09-2007
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
Reply With Quote
  #7  
Old 04-09-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
^^^^ Well that seems like what it is. I guess I wont worry about it?
Reply With Quote
  #8  
Old 04-09-2007
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
I wouldnt, its nothing major and it will more then likely go away when the weather changes.
Reply With Quote
  #9  
Old 04-09-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Quote:
Originally Posted by zabeard
I wouldnt, its nothing major and it will more then likely go away when the weather changes.
Ok.....
Reply With Quote
  #10  
Old 04-09-2007
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
It most likely is what Bob describes. But... you may have a IAC valve that's dirty and not closing all the way. Even though it won't hurt anything.. it maybe dirty and this is why your now hearing it.

Rich
Reply With Quote
  #11  
Old 04-09-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Quote:
Originally Posted by wydopnthrtl
It most likely is what Bob describes. But... you may have a IAC valve that's dirty and not closing all the way. Even though it won't hurt anything.. it maybe dirty and this is why your now hearing it.

Rich
Nah, not the IAC. I just cleaned it and it was doing that before I cleaned it, as long as it doesn't hurt anything, I guess I wont worry about it.....
Reply With Quote
  #12  
Old 04-09-2007
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
If it is manifold pressure that you are hearing, I doubt changes in the weather will have any effect. Atmospheric pressure doesn't change enough to do that.
Reply With Quote
  #13  
Old 04-09-2007
01xltranger4x4's Avatar
Member
iTrader: (3)
 
Join Date: May 2005
Location: MI
Posts: 3,200
Mine has only done it in the summer months...

Im not looking forward to hearing it when it gets warmer either...
Reply With Quote
  #14  
Old 04-09-2007
Member
 
Join Date: Mar 2007
Location: Southampton, Pa
Posts: 68
its no big deal. stop going crazy
Reply With Quote
  #15  
Old 04-10-2007
Member
 
Join Date: Aug 2005
Location: Haverhill, MA
Posts: 1,907
mine always does it, also my friends s10 ss and my other firends dodge ram and we all have Air intakes and they all do that mine is loud and the dodge is really loud. before we put them in they didnt do that.
so u should be fine
Reply With Quote
  #16  
Old 04-10-2007
Member
 
Join Date: Apr 2005
Location: Shelbyville, Kentucky
Posts: 1,101
if you guys are talking about the same sound that i'm thinking, it's nothing more than the brake booster relieving pressure once the motor shuts down...the brake booster draws air from the intake system and once you shut the motor off there's no more air to be pumped into the brake system, so it relieves the leftover pressure...
Reply With Quote
  #17  
Old 04-10-2007
greygooseranger's Avatar
Member
Thread Starter
 
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Quote:
Originally Posted by Sad_Savant
if you guys are talking about the same sound that i'm thinking, it's nothing more than the brake booster relieving pressure once the motor shuts down...the brake booster draws air from the intake system and once you shut the motor off there's no more air to be pumped into the brake system, so it relieves the leftover pressure...
interesting......
Reply With Quote
  #18  
Old 04-10-2007
jtfoxman's Avatar
Member
 
Join Date: Jun 2005
Location: The Poconos
Posts: 891
Mine does this also, just seems like it is louder in the colder weather. The past week or so it has not been noticeable. Like most of the other posters on here I was told it is no big deal since it is just relieving pressure.
Reply With Quote
  #19  
Old 04-10-2007
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
I appoligize up front.. but technicaly it's not relieving pressure. The outside atmoshpere is rushing into the void/vacuum of something. (manifold, brake booster, ect..)

Ok.. I feel better now.

Rich
Reply With Quote
  #20  
Old 04-10-2007
jtfoxman's Avatar
Member
 
Join Date: Jun 2005
Location: The Poconos
Posts: 891
Quote:
Originally Posted by wydopnthrtl
I appoligize up front.. but technicaly it's not relieving pressure. The outside atmoshpere is rushing into the void/vacuum of something. (manifold, brake booster, ect..)

Ok.. I feel better now.

Rich
None needed. So what you're saying is that it is equalizing the pressure between the outside air and engine. That makes sense.
Reply With Quote
  #21  
Old 04-10-2007
Member
 
Join Date: Apr 2005
Location: Shelbyville, Kentucky
Posts: 1,101
Quote:
Originally Posted by wydopnthrtl
I appoligize up front.. but technicaly it's not relieving pressure. The outside atmoshpere is rushing into the void/vacuum of something. (manifold, brake booster, ect..)

Ok.. I feel better now.

Rich

thank you! you are completely correct...and this should apply to both noises that the Ranger makes...one is under the hood and comes from the intake manifold and brake booster, the other is the HVAC system and is coming from the passenger side behind the dash....
Reply With Quote
  #22  
Old 04-10-2007
01xltranger4x4's Avatar
Member
iTrader: (3)
 
Join Date: May 2005
Location: MI
Posts: 3,200
I wonder why mine has only made the noise in the summer?
Reply With Quote
  #23  
Old 04-10-2007
l2en's Avatar
Member
 
Join Date: Dec 2005
Location: The Keystone State
Posts: 4,521
Quote:
Originally Posted by l2en
Just a lil reverse flatulation I guess
Reply With Quote
  #24  
Old 04-11-2007
IN2 FX4's Avatar
Member
 
Join Date: Feb 2005
Location: Costa Mesa, CA
Posts: 855
Quote:
Originally Posted by Sad_Savant
if you guys are talking about the same sound that i'm thinking, it's nothing more than the brake booster relieving pressure once the motor shuts down...the brake booster draws air from the intake system and once you shut the motor off there's no more air to be pumped into the brake system, so it relieves the leftover pressure...
The brake boost operates on vacuum not pressure. It also has a valve in it to hold the vacuum when the engine is turned off. This is a safety feature that gives you full power assist braking, at least once, if the engine dies. There should be no sounds coming from the brake booster when the engine is turned of unless you step on the brakes.
Reply With Quote
  #25  
Old 04-11-2007
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
Quote:
Originally Posted by 01xltranger4x4
I wonder why mine has only made the noise in the summer?
Are you sure it's not a particular steeing of the HVAC controls? Might try shutting it off in different modes.

Rich
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Loud clunking noise after shutting the truck off littlered General Ford Ranger Discussion 1 08-29-2013 11:06 AM
Amplifier Pop/Noise Sound When Turning On & Off Receiver Brandon22685 Audio & Video Tech 3 04-08-2013 03:54 PM
wheel hop while turning right and after small bumps. Matt's01Ranger Suspension Tech 11 02-08-2012 12:32 PM
wierd noise when turning on pavement - sometimes like grinding FMD General Ford Ranger Discussion 7 12-05-2006 09:10 PM
Hum noise after the truck is shut off... 01xltranger4x4 4.0L OHV & SOHC V6 Tech 14 10-10-2006 11:52 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 11:11 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.