Throttle Body Noise - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-15-2012, 08:38 AM   #1
Join Date: Aug 2012
Posts: 3
RYAL is on a distinguished road
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.


1997, Wrangler with 2.5 L.
RYAL is offline   Quote
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: 42,276
Jerry Bransford is on a distinguished road
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.

When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 09-15-2012, 10:25 AM   #3
lwszabo's Avatar
Join Date: Jul 2009
Location: NC
Posts: 762
lwszabo is on a distinguished road
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
Old 09-17-2012, 09:45 PM   #4
Join Date: Aug 2012
Posts: 3
RYAL is on a distinguished road
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
Old 09-17-2012, 09:46 PM   #5
Join Date: Sep 2012
Posts: 6
BarryDaviso is on a distinguished road
I had a power ade brand with a edge intake that whistled like a turbo
BarryDaviso is offline   Quote
Old 09-18-2012, 12:01 AM   #6
Yipeee Kay Ayyy

WF Supporting Member
Wesboy's Avatar
Join Date: Feb 2010
Location: In a galaxy far, far away
Posts: 2,696
Wesboy is on a distinguished road
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
Old 09-22-2012, 07:29 PM   #7
Join Date: Aug 2012
Posts: 3
RYAL is on a distinguished road
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

Thread Tools

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

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 01:56 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

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

Enter your email address:

Delivered by FeedBurner