Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > Jeep squealing/whistling

Join Wrangler Forum Today

Thread: Jeep squealing/whistling Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
02-06-2013 09:34 PM
Tjrubicon17 I'm having a similar issue. When the engine is all the way warmed up (210 deg) there is a horrible squealing sound when I come to a stop. As soon as I get over 5 mph the squeal stops. Even if I'm stopped and I rev the engine the squeal persists, only when I begin driving does the squeal stop. Is this a pulley issue?
02-03-2013 07:46 PM
JRIEDY85 Take your belt off and start the engine and see if it still squeaks. If it does then it's something in your engine and not a pulley.
02-01-2013 07:38 PM
ScubaSteveTJ the pulley in your pic (stationary pulley) is easy to change, if you have to change the tensioner pulley, its a little tricky. You have to line up the tensioner bolt housing and the pulley bolt when putting it back together.

these are the bolts that you need to get to in the diagram

the pic of the broken bolt (dont do lol) is the tension bolt and the square part is the housing the pulley bolt goes into. its behind the metal frame the pulley is on

you can see it if you climb under your jeep behind the front driver side tire.
02-01-2013 06:33 PM
ipath68 Super easy just pull the bolt holding it on. Go to a parts store get a pulley about 15-20$ check the belt tensioner pulley also. Those were the two I had to replace. If that one is bad too pull the torx holding the tensioner on then take it off and there is a torx on the backside. Same thing get a pulley and replace.
02-01-2013 06:29 PM
JeepReaper09 This may actually be my issue, my idler pulley is a bit corroded/rusted and has a bit of a roughness to it so I would imagine my replacing it would cure my whistle, and my belt would probably be happy with a replacement pulley as well. Any idea how much and how difficult this is?

Sorry for the multiple images of the same thing... damn computer!
02-01-2013 05:43 PM

if it sounds like the one in my ended up being the stationary idle pulley
02-01-2013 05:13 PM
JRIEDY85 Could be an exhaust manifold leak. Mine was cracked and made a squealing noise. Not really a whistle tho. But check it out.
02-01-2013 04:54 PM
Originally Posted by Howard_Urick_3 View Post
Whistling Noise Solved!

Opening the hood we finally discovered the culprit – the screw that holds down the intake and exhaust manifolds on the front of the engine near the first fuel injector!
Once sprayed with Tri-Flow "penetrating lubricant" and tightening of the bolt it resolved the issue. The whistling was gone.
I didnt go as in depth as you did chasing the Whistle, but I did go straight to your Whistle fix, and tightend the screw holding on the intake and exhaut manifolds. No such luck for me though. I even went further and tightend all of the intake screws.

My annoying whistle happens only on the freeway above 50 MPH, and at a very precise throttle postion (usually at my cruising speed). Its not too terribly loud, but definitely noticable on the highway. GOGETUM94's idea with the radio seems to help, but when it comes to little noises, I this complex to not stop until I find the noice.

Anyone with other suggestions?
01-29-2013 11:30 PM
Howard_Urick_3 Whistling Noise Solved!

I know exactly what is wrong with your Jeep. For the past three years, my 02 Jeep Wrangler X has been giving off this horrible whistling noise like nails on a chalkboard. It always started once I let my foot off the accelerator while I was on the highway. Always starting when I got over 50 mph. At first I simply could not figure out what the problem was and by the time the third year ended I had almost given up hope. The noise was unbearable. People could hear me coming down the street a mile away. It was even worse at stop lights.

Finally about a month ago, my jeep started acting up. There was no power in my acceleration. With each passing day, my jeep got slower and slower. I couldn't even get over 50 mph on the highway. My check engine light read P0432 - Main Catalyst Efficiency Below Threshold.

Obviously something was blocking my exhaust system from working properly. So yesterday I took apart my catalytic converter and discovered something extraordinary. One of my converters near the engine had completely disintegrated into the pipe and was now clogging up my rear converter causing the cats to become red hot while I was driving regularly. Due to the cats being red hot it melted an O2 sensor wire causing the engine code and the engine itself to run rich. After driving it for three years running rich it caused many problems including:

The idler pulley, tensioner, and the belt to go bad.

Washers on the fuel injectors to go bad with the valve cover gaskets top and bottom.

All PCV valves to go bad.

The battery died due to the delayed starts caused by the clogged cat.

Once I replaced all the washers on the fuel injectors the whistling problem was resolved temporarily for about five miles then the whistle returned. Although frustrated I knew now that I was on the right path. But before proceeding any further with the whistle I decided instead to fix the main cause of all my problems: the catalytic converter.

We put degreaser and soap and water through it and nothing came out the other side. Therefore to remedy the problem I "increased the flow" of the catalytic converter with a hollowed pipe. Once reassembly was complete I took my jeep out for a drive. And believe me when I say “what a difference!” My power was back. My jeep itself felt like it had been reborn. The only problem remaining was still the whistling noise. Only this time it was worse than before.
Opening the hood we finally discovered the culprit – the screw that holds down the intake and exhaust manifolds on the front of the engine near the first fuel injector!
Once sprayed with Tri-Flow "penetrating lubricant" and tightening of the bolt it resolved the issue. The whistling was gone. In conclusion, all of the residual problems which I had to fix originated from my catalytic converter going bad. You may not have all of the issues that I had but regardless I would urge you to check for these problems.
12-03-2012 06:38 PM
bykryd When you find the leak use some SuperGlue to seal it and you save yourself alot of work and money.
12-01-2012 07:16 PM
Braydenp1012 Ok, I went and bought some carb cleaner. I couldn't get any idle change while spraying. I sprayed all the areas shown in the photo, 3 elbow connections on the side of the intake manifold, around the throttle body area, the two hoses on top in the back of the manifold, and the crack where the manifold and headers connect to the engine. None made any change in the engine idle. Any other places I should try?
12-01-2012 01:46 PM
Braydenp1012 There is a foil insulator thing on the top of the manifold, that is in the way for me to check gasket, is it okay to take this off?
11-30-2012 11:09 PM
AHLJWV It's probably your intake manifold gasket. I've read some threads on here with the exact same symptoms and the fix was always replacing that gasket.
11-30-2012 09:25 PM
Braydenp1012 Haha, thanks. Ill go buy some carb cleaner tommorow and try again.
11-30-2012 08:51 PM
ohioviper Try spraying along the intake to head where the intake gasket is. I would also use carb cleaner as WD never worked for me .PS thats a dam nice clean engine you got there.
11-30-2012 08:32 PM
Braydenp1012 I went out in the garage tonight and sprayed most of the little hose connections I could see connecting to the intake. I didn't have any carb cleaner, but I read that wd-40 would work too, so I tried that. After spraying the connections I could see, none made any change in the idle speed. Are there any specific ones I should try that I may not have checked due to my lack of knowledge on vacuum lines?
11-29-2012 07:45 PM
ohioviper Vacuum leak on intake manifold. I have the same problem on my sons TJ. Take a can of carb cleaner and spray a little around intake and if motor speeds up you found your leak.
11-29-2012 07:11 PM
Braydenp1012 Gogetem1994, Mine doesn't make the sound in 4th gear either(which is the overdrive gear according to the reading I've done online) so that's really weird. Or I might not have pushed the engine hard enough in 4th, cause of the speed limit being 50, and cops always crawling all over the road.
11-29-2012 07:02 PM
Braydenp1012 Yeah, very annoying. I tried to record a video of the sound with my smartphone while driving, but the whistle is so high pitched the microphone couldn't even pick it up! And my dad couldn't hear it very well so maybe it's something so high pitched that only young ears can hear it good. Anyways it's super annoying being that high pitched. Cleaning the cold air intake didn't change it at all. So maybe it's a vaccum line leak? Would the pressure in vaccum lines change with the amount of throttle applied? Cause if not, there must be some component of the intake that's causing the whistle.
11-27-2012 10:42 PM
iadoin I'm in the same boat as everyone here. Mine though is at a certain point in 4th and 5th gear I get the high pitched whistling. Very annoying!
11-27-2012 10:34 PM
Superdave1017 Same issue with me !!! Exactly the same

No cai though
11-27-2012 10:28 PM
GoGetEm1994 I have the same exact noise as you!!!!! same with the gas pedal and 20mph. No idea what is causing this. i just turn my volume on the radio up and try to ignore it. The noise goes completely away once I am in 4th gear, I have no clue why.
11-27-2012 05:46 PM
Braydenp1012 Been driving it around since cleaning the air filter, and nothing has changed, it still makes the exact same squeal/ whistle sound. Not sure what to try now...
11-20-2012 07:35 PM
Braydenp1012 Just got around to cleaning air filter. Not much dirt came out of it. I also took the whole cold air intake tube out and inspected it for cracks, it's perfect. Hopefully putting everything back on tomorrow and tightening all the clamps will fix the squeal.
11-18-2012 10:13 PM
Braydenp1012 I dont have the stock intake since i bought it used, buthaven't tried cleaning the filter, I bet it hasn't been cleaned in a long time, I'll try that tomorrow.

Thanks for the suggestions
11-18-2012 09:49 PM
PDXJeeper I bet it is the CAI, if you have the stock air box put it on and see if it changes. If you don't, try cleaning the filter. I hope one of these changes or fixes your noise.
11-18-2012 09:40 PM
Mom sold the Jeepster U-toobe has vids to show you how, the Haynes repair manual has some info, too. If you have time and the desire, go for it.
11-18-2012 09:14 PM
Braydenp1012 Thanks for the replys, I really hope it's not one of those driveshaft joints or u joints, cause I would have no idea how to fix that, and that sounds expensive to fix. Could it really be that? The strange thing is that it only makes the whistling/squeal sound when the gas pedal is in a certian position, so that being said would there still be the possibility of a driveshaft/ u-joint problem?
11-18-2012 01:14 PM
lawndog check your front driveshaft on the transfercase side I had a loud squealing sound i changed brakes and wheel bearings and still had a noise it was the double cardan joint
11-18-2012 12:06 PM
ipath68 I have something similar to yours I posted a thread jeep is howling, mine isn't quite a squeal its that whistle howl noise.
This thread has more than 30 replies. Click here to review the whole thread.

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

All times are GMT -5. The time now is 12:12 AM.

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