Very low RPM with vacuum suction sound - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-21-2014, 09:00 PM   #1
Jeeper
 
95YJgirl's Avatar
 
Join Date: Jan 2014
Posts: 52
Very low RPM with vacuum suction sound

I've had a vacuum sound when my heat is on high in my 95 for a couple of weeks. Today it was idling very low. Between 200 and 300 and my RPMS were running very low. I was driving in 3rd going 22-25 and my RPMs started going up to 4000. I shifted and it was still doing it. Got into 5th and it went back to running low but I got home without them going insane again. The repair shop couldn't find a vacuum leak last week. Any ideas what this could be? Any help is much appreciated. Thank you I'm advance!

95YJgirl is offline   Quote Quick Reply
Old 02-21-2014, 09:28 PM   #2
2.5L SYMPATHIZER

WF Supporting Member
 
W5KVV's Avatar
 
Join Date: Oct 2013
Location: S.E. Oklahoma
Posts: 823
Does it only happen when the heat is turned on?

If it went up that high in RPM, you have a major vacuum leak. The only thing I can think of that would cause that big of a leak is the brake booster or the line running to it.

__________________
1995 Rio Grande - 2.5 - AX5 - 160k -
4"RC - 1/2"booms - 33's -




W5KVV is offline   Quote Quick Reply
Old 02-21-2014, 09:44 PM   #3
Jeeper
 
95YJgirl's Avatar
 
Join Date: Jan 2014
Posts: 52
You can only hear the suction sound with the heat on high. What would need replaced for it to he fixed? The vacuum lines are around the carb aren't they?
95YJgirl is offline   Quote Quick Reply
Old 02-21-2014, 10:04 PM   #4
2.5L SYMPATHIZER

WF Supporting Member
 
W5KVV's Avatar
 
Join Date: Oct 2013
Location: S.E. Oklahoma
Posts: 823
If your 95 is stock, it has multi port fuel injection, so no carb. The vacuum for accessories is drawn from the intake manifold.

The position of the fan speed switch should have no bearing on a vacuum leak as the fan is electric. If it was vacuum/heater related, it would start acting up as soon as you moved the lever from off to defrost, heat, etc. regardless of the fan speed.

With a leak that big, it should be easy to find. Do whatever you have to do to duplicate the sound & try to track it down by ear.
__________________
1995 Rio Grande - 2.5 - AX5 - 160k -
4"RC - 1/2"booms - 33's -




W5KVV is offline   Quote Quick Reply
Old 02-24-2014, 02:55 PM   #5
Jeeper
 
95YJgirl's Avatar
 
Join Date: Jan 2014
Posts: 52
Is the vacuum leak causing my RPMs to be low? Our mechanic still can't seem to find anything
95YJgirl is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 05:57 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC