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Old 12-16-2010, 10:17 PM   #1
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Angry Help on screeching noise in engine compartment

Okay everyone, I know I have posted this before, but I still have not had much luck. I have a 2004 Wrangler X with a 4.0. Whenever it is cold outside and the engine is cold, there is a loud screech or squeal in the engine bay somewhere when the Jeep is in motion. I think its called the "Angry Sparrows." Whenever I just start driving when it is cold, it happens, but it usually goes away when I get over 55 mph roughly. It usually always happens between 35 to 45 mph. Once the engine warms all the way up it goes away sometimes but not all the time. When it is warm outside it never happens though. It is a high pitch sound that sounds like it is coming from something that is turning but is not turning that fast. When I speed up it speeds up too. Thanks to your suggestions in the past I have looked at the U-joints, the CV, sway bar, linkage to the transmission, and water pump and they all check out to be fine. It sounds like a rusty fan or something, or like the sound you hear when a car that has not been taken care of drives by you. I have taken it to the dealer twice, and no luck. No one else I have talked to or has heard it knows what it is either. Any information would be greatly appreciated. Thank you!

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Old 12-17-2010, 03:22 AM   #2
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I know you said you checked the front drive shaft CV but did you actually take the shaft out and inspect it? If it's the stock Ball and socket it will not be able to be greased. Because of this they wear/dry out over time, the u-joints might be ok but the ball and socket will be worn, that is what causes the squealing noise. The only problem to this is that the sound does not come from under the hood, the CV is at the transfer case. Remove the front driveshaft and go for a drive, if the sound disappears then you will know it's the CV. Other than that it could be that your serpentine belt is worn to the point it slips when it's cold out and squeals. Another idea is that it could be your AC pump clutch, even though you are not using the AC it is activated when you turn on the defroster. To check that disconnect the connector on the pump and turn on the defroster and see if the noise is still there. Check those things out and get back to the forum with your findings and we can go from there.

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Old 12-17-2010, 05:09 AM   #3
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sounds to me like a belt or minor vacuum leak
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Old 12-17-2010, 05:23 AM   #4
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mine does the some think ever since I had my fan clutch, water pump and belt replaced

especially when after it rains or there is morning dew
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Old 12-17-2010, 05:45 AM   #5
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Go to NAPA and get a small spray can of silicone or belt dressing. Spray the belt and see if it goes away. Mine developed a chirp recently, and I thought it was a pulley or pump on the way out. It was the belt and the silicone immediately stopped it. Just a thought.
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Old 12-17-2010, 06:21 AM   #6
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Quote:
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sounds to me like a belt or minor vacuum leak
x2
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Old 12-17-2010, 06:57 AM   #7
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I tried the belt and that is not the problem sadly. I will try to disconnect the front driveshaft and I will see what happens
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Old 12-17-2010, 07:01 AM   #8
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mine did it when it was 1st started and i had the heat(defrost) on. if this happens when you use the heat, try turning it to the floor setting-if it stops it's either your ac or a loose/worn belt. mine was a loose belt-once i figured out the goofey adjustment and tightened it up it was fine(bought a new belt but nothing was wrong with the old one except being a little loose so i have a spare now)
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Old 12-17-2010, 11:48 AM   #9
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Your symptoms are the exact same symptoms as mine when the oil pump drive assembly was failing. I would definetly check that out if I were you. Start your engine, open the hood and touch the OPDA and see If it vibrates. I bet you that's it. Let me know.
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Old 12-17-2010, 02:46 PM   #10
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The heat can be on or off, it really doesn't matter. I will try the OPDA too
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Old 12-17-2010, 02:47 PM   #11
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Quote:
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sounds to me like a belt or minor vacuum leak
^^^thread winner.
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Old 12-17-2010, 05:09 PM   #12
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Its not either of those. haha. I wish it were so I can stop hearing this noise
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Old 12-17-2010, 05:24 PM   #13
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If you could provide a more specific RPM range of when this problem occurs some other people may be able to better identify the problem/chime in. Also if the problem exists at idle if you get to a certain RPM range. Specification of manual/auto trans also helps
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Old 12-17-2010, 05:35 PM   #14
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It is a automatic where it does not matter in the RPM range, where it is in the 2500 range or 1000, it doesn't matter, as long as the car is moving roughly from 35-45 mph. It never happens at idle or when it is warm or hot outside, and it doesn't matter if the heat or defroster is on or off
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Old 12-17-2010, 08:45 PM   #15
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If it only happens when the car is moving then it must be a driveline problem, not an engine problem.

If you have $80, a bench vise, and a socket set, you can replace all 3 front end ujoints, and the driveshaft CV.

You cannot check these things by "inspecting them" The axles / driveshaft have to be out in your hand to find a bad joint.
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Old 12-17-2010, 09:57 PM   #16
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Go to NAPA and get a small spray can of silicone or belt dressing. Spray the belt and see if it goes away. Mine developed a chirp recently, and I thought it was a pulley or pump on the way out. It was the belt and the silicone immediately stopped it. Just a thought.
tried that 2 weeks ago and it didn't fix it
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Old 12-18-2010, 02:52 AM   #17
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Did you remove the drive shaft yet?
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Old 12-18-2010, 12:18 PM   #18
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Yeah and it still happened
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Old 12-18-2010, 01:25 PM   #19
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Hey man, I was just about to make a thread about this problem too because Ive been having it three weeks since It got cold here. It happens to me between 20 and 45 mph and goes away at higher speeds. its always between 1400 and 2000 rpms then goes away above that. I also find it goes and comes as you said so I feel like we may have the same issue. I just had both the wheels off today to check brakes because It made a sound like something turning just as you stated... and also speeds up like you said. Breaks were good and I greased up everything and still have the problem. So it sounds very similar to me. I could not precisely locate the origin of the sound but I think it sounds like front left to me. but maybe rear its really hard to tell. Anyways, Im gona keep trying stuff to fix it, but hopefully one of us can figure it out and let the other know. Im gona look into it some more today now, or take it to the shop if all else fails.
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Old 12-18-2010, 04:53 PM   #20
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Yeah that sounds exactly like my problem. Hopefully one of us can figure this out. It is the most annoying and embarrassing things in the world
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Old 12-18-2010, 10:28 PM   #21
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yea, it does kinda piss me off as well... hahaha. it seem like it got worse today... my breaks didnt look worn at all but I though it was that pin that warns u your brakes are low. I might get someone I know to look at it.
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Old 12-19-2010, 01:42 PM   #22
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Okay so my dad and I took it for a drive today and eventually got the thing to make the noise. We both agreed that the noise is coming from where the transmission and the transfer case are more than the engine. But since the noise is very defined not muffled, its not coming from the transmission. Would there be anything that would vibrate making the noise? A change in the RPM's does not affect the speed or loudness of the noise where the speed does
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Old 12-19-2010, 02:34 PM   #23
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Im not sure, I dont know enough to say... I notice when I turn right it often times stops, and when I turn left It starts up worse... It went away for a good while today, then started again. Its pretty frustrating.
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Old 12-19-2010, 02:40 PM   #24
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Power steering pump??

Check the fluid. There seems to be a rash of that today. LOL

Also.....check for loose or worn belts. That's probably not what it is, but it's an easy check, and it oughta be checked anyway. (another rash)
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Old 12-19-2010, 02:48 PM   #25
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Haha I looked at everything the other day (including belts) but Im gona give it another once over, go through some more grease on some stuff, and Ill look at the power steering pump/fluid.
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Old 12-19-2010, 07:40 PM   #26
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Okay well I went at it again today, and as I listened more and more it sounded like it came from the front left. I slapped some grease on and looked around and found a metal sleeve/ring between my case and where the bearing(?) is where the front wheels pivot. on the right side, it was up close to the casing, almost tight, but on the left it was out about an inch. I through some greasin in here to see if it could be rubbing and causing the screech, and it the bearing/pivot. I took it for a drive tonight for about a halfmile and back home. and it didnt make the noise the whole time! and as I made the left turn into my driveway.... screech. It seems that turning left causes this sound. so for me it has to be something outside the engine and transfer case I would say. I still cannot pinpoint this.
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Old 12-21-2010, 03:08 PM   #27
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bumpity bump
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Old 12-21-2010, 03:18 PM   #28
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I am still getting the noise every day as usual. It looks like on Monday I will go under the Jeep and start taking things apart and inspecting them with the help of my dad. I will let you know the results.
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Old 12-21-2010, 05:54 PM   #29
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This sounds very similar to what I just experienced no more than 20 minutes ago. At first I thought it was my brakes cause they are just now starting to squel, but it didn't stop when I had come to a full stop. Its a very high decibel sound that continues during idle, but goes away when the gas it pressed, then back when idling, no matter what the rpm is.

Now its been sitting in the drive way idling for 10 minutes and all sounds fine.... confused much?! Gotta go to kansas tomorrow too.
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Old 12-22-2010, 01:27 PM   #30
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Ok man I am also going to take a look here agin in about 20 mins but I doubt I will find much out... let me know how it goes. ahhh hammer but our problem is when driving, if yours is while idling it could be from a belt or something else... at least you know its nothing related to cv down

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