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Humming Vibrating Noise when Jeep is off.
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=22798		 Page 1 of 1
Author:  E5T0311 [ Tue Jul 24, 2007 8:42 pm ]
Post subject:  Humming Vibrating Noise when Jeep is off.
I recently got an 04 Limited 44,000 miles and have noticed a deep humming / vibrating noise coming from the rear when the vehicle is parked. It only lasts for about 1.5 seconds and then is quiet for 10 - 15 minutes and it does it again. I've laid under the back end and was thinking it was a fuel pump, but when I had the key turned on the fuel pump sound is a faster, higher pitched sound. The noise is coming from somewhere around the fuel tank.

I'm new here and have a few questions, but will post them one at a time. If anyone knows what this is and how to fix it, your help would be appreciated.
Author:  adamkrz [ Tue Jul 24, 2007 9:20 pm ]
Post subject: 
This has been posted before but no answers yet,I hear the same thing from mine,Maybe it's the fuel pump?I first noticed mine when tent camping next to the KJ - it woke me up every 1/2 hour or so,Anyway Semper Fi my brother..
Author:  tjkj2002 [ Tue Jul 24, 2007 9:23 pm ]
Post subject: 
Most likely the evap purging the built up gas vapors from the evap canister.It's located next to the fuel filter on top of the gas tank.
Author:  Blue KJ in PA [ Tue Jul 24, 2007 9:29 pm ]
Post subject: 
I had a hiss while engine was running and a for little bit once engine was turned off...it was a loose hose off of the evap canister above the fuel tank as mentioned by tjkj
Author:  E5T0311 [ Tue Jul 24, 2007 9:34 pm ]
Post subject: 
Ok, so I've either got a gremlin or an active Evap system? I guess I'll find out this winter. Are there any concerns about draining the battery? I assume since no one seems to know what it is, it's ok to just ignore it?

It's my daughters ride and I don't want her to be stranded.
Author:  E5T0311 [ Tue Jul 24, 2007 9:36 pm ]
Post subject: 
Blue KJ in PA wrote:
I had a hiss while engine was running and a for little bit once engine was turned off...it was a loose hose off of the evap canister above the fuel tank as mentioned by tjkj


This will do it at random intervals when the Jeep hasn't been running for several hours. It will even do it when it has not been driven the entire day. If it's a loose hose how hard is it to get to?
Author:  LiLredLibby [ Tue Jul 24, 2007 9:38 pm ]
Post subject:  Re: Humming Vibrating Noise when Jeep is off.
E5T0311 wrote:
I recently got an 04 Limited 44,000 miles and have noticed a deep humming / vibrating noise coming from the rear when the vehicle is parked. It only lasts for about 1.5 seconds and then is quiet for 10 - 15 minutes and it does it again. I've laid under the back end and was thinking it was a fuel pump, but when I had the key turned on the fuel pump sound is a faster, higher pitched sound. The noise is coming from somewhere around the fuel tank.

I'm new here and have a few questions, but will post them one at a time. If anyone knows what this is and how to fix it, your help would be appreciated.


First off.....Welcome....Glad you could get L.O.S.T. with us.You came to the right place,but we're not concieded,just convinced. :lol: :lol: :lol:
Sounds like TJKJ2002 has the right idea,in that it's probably the purge valve,and there may be a problem with a relay or something activating it more than necessary. :?: You might try and see if you can pull up a trouble code to help determine where the problem is.Keep us posted as we all enjoy solving problems.

Ron
Author:  E5T0311 [ Tue Jul 24, 2007 9:45 pm ]
Post subject:  Re: Humming Vibrating Noise when Jeep is off.
LiLredLibby wrote:
First off.....Welcome....Glad you could get L.O.S.T. with us.You came to the right place,but we're not concieded,just convinced. :lol: :lol: :lol:
Sounds like TJKJ2002 has the right idea,in that it's probably the purge valve,and there may be a problem with a relay or something activating it more than necessary. :?: You might try and see if you can pull up a trouble code to help determine where the problem is.Keep us posted as we all enjoy solving problems.

Ron


Thanks for the welcome. Would this be a simple code that a local Autozone could pull, or are you talking paying money for a good code read?
Author:  LiLredLibby [ Tue Jul 24, 2007 10:16 pm ]
Post subject:  Re: Humming Vibrating Noise when Jeep is off.
E5T0311 wrote:
LiLredLibby wrote:
First off.....Welcome....Glad you could get L.O.S.T. with us.You came to the right place,but we're not concieded,just convinced. :lol: :lol: :lol:
Sounds like TJKJ2002 has the right idea,in that it's probably the purge valve,and there may be a problem with a relay or something activating it more than necessary. :?: You might try and see if you can pull up a trouble code to help determine where the problem is.Keep us posted as we all enjoy solving problems.

Ron


Thanks for the welcome. Would this be a simple code that a local Autozone could pull, or are you talking paying money for a good code read?


I think you could do a key cycle retreival,and get in the ballpark.Starting with the key in the off or locked position,turn the key to on(not crank)and back off,three times within 5 seconds,leaving it on,on the third cycle.The light will flash....once and pause breifly,and then flash twice.That is a code 12 wich only means your start of the test.then it will begin flashing hard fault codes if you have any.Such as 2 flashes,short pause,4 flashes,would be a code 24,and so on.
The test should end with the seperator code of 55,or 5 flashes,pause,5 more flashes,and 55 only means the end of test.
So both 12 and 55 are only begininmg,and ending points,and have no bearing on hard fault codes.DC's self test are kinda slow compared to others,so be patient,and read flashes carefully.If you miss something,you can turn the key back to off for a few seconds and repeat the cycle.Hope tis helps,and if I screwed something up here then someone bail me out,as I work on sooooo many different brands that it's hard to keep up. :lol: :lol: :lol:

Ron
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