whistling sound

[imthehink]

My jeep makes a whistling sound after driving it for a few minutes. It gets faster and louder as I speed up. The whistling sound goes away at idle. I press the gas at idle and let the rpms go up and it don't whistle. It only whistles when driving. I put it on jack stands and put it in drive to see if I could hear it, still nothing. It's coming from the front. I can't actually pinpoint where at in the front, because it only does it while driving. 93 auto 4.0 4wd. any help would be great.

[jeeptree]

On my 93 I changed the belt and idle pulley and the whistling went away. Dose it do it in park or just in drive? and you my want to see if your vac lines have any little leaks. I had a car that was whistling and that was it.

[imthehink]

It doesn't do it in park. Only in drive while driving.

[Blaine B.]

Maybe your window or door gaskets are bad and it's just the wind?

[YELLAHEEP]

On my 93 I changed the belt and idle pulley and the whistling went away. Dose it do it in park or just in drive? and you my want to see if your vac lines have any little leaks. I had a car that was whistling and that was it.


Ditto. My '93 had a whistling that sounded like a toy train whistle when I throttled up. It did it more often when I would be driving, but would do it while parked too. It took me forever to figure out that it was a bad bearing in the idler pulley.

Mine is a 5sp so I can't figure out why the original poster's vehicle would do something similar, but not when in park. Mine was also much louder when cold, quieter or gone when warmed up.

Might not be a bad idea to check the condition of the vacuum hoses and PCV, then spray around the intake manifold under the throttle body and around the intake runners to the head - using carb cleaner as the spray material will cause the idle to bump up if a leak sucks in the carb cleaner.

Another thing: check the condition and fittment of the vacuum line from the engine to the brake booster. I've heard boosters whistle when the gasket around the one-way valve that plugs into the booster goes bad. Check to see that the booster is holding it's vacuum by starting the XJ, then turn it off, then pull the one-way valve out. You should get a rush of air into the booster as the vacuum seal is broken.

[imthehink]

It was the idler pulley. The last thing I thought to check. thanks everyone

[Blaine B.]

Nice

[jeeptree]

i did it i help some one sweet, there now i dont feel so bad when i ask everyone to help me. i got my idler pulley for $19 at napa two weeks ago.

[imthehink]

the sound came back. I got a gatorback belt and put it on. The sound is a little more quiet, but now it sounds like birds chirping also. the waterpump seems fine, no leaks. All the pulley's are in line. any suggestions?

[Sting25]

My jeep makes a similar noise...I get the whistle sound when driving only with the engine under load...I think it has to do with my A/C because the one time I could make it reproduce while sitting in the garage was when I was refilling the Coolant. I either didnt do this right or my a/c is shot so I am going to try it again soon just havnt gottn around to it yet but i think thats where my noise is coming from.

[imthehink]

I just discovered this as I revved the engine and listened for the sound. It came from this area. Would this cause a whistle or any sounds?
http://i84.photobucket.com/albums/k13/imthehink/S5031549.jpg (http://i84.photobucket.com/albums/k13/imthehink/S5031550.jpg)

http://i84.photobucket.com/albums/k13/imthehink/S5031550.jpg

[Blaine B.]

Is that A/C freon or engine coolant?

Either way the leak = bad :lecture:

[imthehink]

it's coolant. I'm changing the hose today.

[imthehink]

could it be the harmonic balancer. It don't look to good. Another thing I noticed, when slowing down, it gets a little louder now. The noise still goes away at idle.
http://i84.photobucket.com/albums/k13/imthehink/S5031551.jpg
http://www.naxja.org/forum/%5BIMG%5Dhttp://i84.photobucket.com/albums/k13/imthehink/S5031551.jpg%5B/IMG%5D

[Blaine B.]

That leaking hose - that goes to the heat valve, right?

[imthehink]

yeah it does. I just put a new clamp on it. Doesn't leak anymore.

[Blaine B.]

Strange, I think the hose is still bad because it was seeping out from the middle of the rubber....not where the hose meets the metal "nipple"

[imthehink]

ok, i'm stumped and annoyed. I took it to two shops and they couldn't find anything. The squeal starts at exactly 15 miles per hour and continues untill I stop. I've spun all the pulleys by hand and everything is good. help!!!

[a7273chargerguy]

check the vacuum line going to your front diff.BRYAN.

[StuckXJ]

Mine does it too. I've narrowed it down to the A/C clutch. I noticed it does it when its cold, and I put on the defrosters which will cycle the A/C. I havn't fixed it but, mine doesn't do it all the time so it doesnt bother me.

[Blaine B.]

If it's cold enough, the A/C won't kick on...If you laeave your climate controls on Vent or Heat (something that CAN'T engauge the A/C) does it still make the noise?

My A/C will whine, more with increased RPM's....not a serious problem to whine, but a squeak is.

[imthehink]

yeah, it still squeals with the vent and heat on. I tried that this morning. I'm leaning towards the power steering pump. This morning, I stuck my head out the window, and I'm almost positive ths PSP must be it. Also, mine is very similar to this post.http://www.naxja.org/forum/showthread.php?t=30515

PSP possible? I'd hate to put a new one on for nothing. Like I said, It only starts at 15 mph when the engine warms up and continues untill I stop. Sometimes after I stop. It continues for a couple seconds.

[Billfaceeee]

I used some TB cleaner on my TB and it now make's a whistling noise at certain throttle position's in fourth (Manual transmission) and sometime's it doesn't, I find it annoying hopefully it will go away.

[luvme88xj]

i had a chirping noise also. removed front drive shaft and it went away. lubed double cardan in three spots, two on the side and one in the center with a needle adapter for the grease gun. no more chirping

[imthehink]

I'll take the front drive shaft off when I get off work and see what It does.

[imthehink]

Well, I opened my hood to check my vacuum lines once more and immediately smelled ps fluid. The ps fluid was all over the pump. It looks like it came from the cap. The cap was tight. Replacing the PSP tomorrow. Anyone seen or heard of this?

[Blaine B.]

Overfilled?

[imthehink]

It wasn't overfilled. I've never seen anything like that. I'm draning and refilling it, and going to drive it around and see what it does.

[Blaine B.]

Hm, strange indeed. Could be the seal on the pump splashing fluid onto the bottle making it look like it came from the cap......or the bottle itself may be cracked too.

[imthehink]

I'll replace it tomorrow, and hopefully that's what's it. As it needs to be replaced anyway now.

[Blaine B.]

Well, what else could it be.......I'm sure replacing it will remove any woes!

[imthehink]

Replaced it today and the whistle is still there. very annoying.

[Blaine B.]

Hm really......I can't think of anything else! How about the leak, is it still there?

Maybe the whistling and leak were totally different problems......I don't know now.

[imthehink]

No leaks so far. The gear box don't whine, does it? Maybe the alternator? I'm stumped

[Blaine B.]

How about the A/C compressor, or is it off? Mine whines sometimes......

Can you pinpoint the whine, because the alternator is on the other side.....

Maybe get a recording if you have like a digital camera w/ video recorder, or something?

[imthehink]

it's hard to pinpoint because it only does it while driving. I'll get video while driving it and post it up.

[imthehink]

I did notice the pulley is about an 1/8 from being flush with the pump shaft. I tried to push it down to be flush, but It won't go any further. Would being an 1/8 off hurt anything?

[imthehink]

I finally found it. Took out the front drive shaft, and the noise went away. The noise was coming from the front of the transfer case, I can hear it when turning by hand. This may sound stupid, but what 's the front part of the t case called, and what needs to be replaced? thanks

[200K XJ]

Dangit!! Every single time I find a thread similar to an issue I'm having with my xj and I spend 10min reading three pages of BS just to find out no one posts the solution to the freakin problem!!
:badpc: