Throttle Body Noise - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ 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 09-15-2012, 08:38 AM   #1
Newb
 
Join Date: Aug 2012
Posts: 3
Throttle Body Noise

When the engine is cold there is no noise. At operating temperature after pressing the accelerator, a loud shrieking noise comes from the engine. It sounds like a fan belt slipping.

On closer look, the noise is coming from the air breather. When I put downward pressure on the air breather the pitch changes and it returns to the original pitch when I let go.

I've read about others who have had noises with throttle body spacers. I don't believe mine has one.

I've removed the breather, used a cleaner to get rid of the minimal amount of residue/carbon that I could see on the throttle body. Didn't work. Then I replaced the gasket under directly under the throttle body, unfortunately that didn't work either. I'm wondering if there is a part inside the throttle body that might have come loose or if air is getting in from somewhere else that is creating that whistle-type noise. I even tried calling the dealer about purchasing a new throttle body but they aren't available.

Any other suggestions would be appreciated.

I'm new to the Jeep world and this forum, so my apologies if something is out of place.

Thank you.

Bob

1997, Wrangler with 2.5 L.

RYAL is offline   Quote Quick Reply
Old 09-15-2012, 10:21 AM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,833
Images: 2
There's not much to a throttle body, it does nothing more than control how much air it allows into the engine. I doubt the throttle body itself is what is causing the whistle.

What are you referring to as the air breather? Are you talking about the PCV hose on the valve cover?

If you post a good close well-lit pic of your throttle body we can tell you if there is a throttle body spacer present. There or not, it's not doing anything harmful or good.

__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 09-15-2012, 10:25 AM   #3
Jeeper
 
lwszabo's Avatar
 
Join Date: Jul 2009
Location: NC
Posts: 693
Probably wrong but worth a shot! Do you has a throttle body spacer or cold air intake? Some of these whistle. I had a power ade brand with a edge intake that whistled like a turbo, and a aem that didn't make much at all.
lwszabo is offline   Quote Quick Reply
Old 09-17-2012, 09:45 PM   #4
Newb
 
Join Date: Aug 2012
Posts: 3
Looks (sounds) like it may not be the Throtle Body. I cleaned it thoroughly. The sound was still there.

Getting frustrated, I put my nose about 5 inches from the engine, midway between the throtle body and exhaust manifold to try and track the source of the sound. It seems like the sound is coming from the manifold area next to the engine. At least I'm getting closer, and I have the cleanest throtle body in town.

Thanks for replying.
RYAL is offline   Quote Quick Reply
Old 09-17-2012, 09:46 PM   #5
Newb
 
Join Date: Sep 2012
Posts: 6
I had a power ade brand with a edge intake that whistled like a turbo
BarryDaviso is offline   Quote Quick Reply
Old 09-18-2012, 12:01 AM   #6
Yipeee Kay Ayyy

WF Supporting Member
 
Wesboy's Avatar
 
Join Date: Feb 2010
Posts: 2,029
get a 2 foot length of hose, stick one end in your ear and point the other end at what you think is making the noise (like a stethoscope) - this will quickly isolate exactly where the noise is coming from.
Wesboy is offline   Quote Quick Reply
Old 09-22-2012, 07:29 PM   #7
Newb
 
Join Date: Aug 2012
Posts: 3
Smile Problem Solved

Thank you for the suggestion! The hose did the trick. I was able to find a small tear in a vacum line.

One month later, with considerable frustration and aggregation behind me, the annoying sound is in the history books.

Thanks for taking time to offer suggestions.

RYAL 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




» Featured Product

All times are GMT -5. The time now is 07:29 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