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Unread 10-21-2010, 08:58 AM   #16
jlconlin
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Quote:
Originally Posted by KennzX View Post
Mine does it when ever irs slightly cold and a little moist. Its my AC clutch. Like if it starts whistling and you jump the gas a little it goes away?
If I push on the gas, the pitch of the noise goes up until it hits a certain point and it goes away. When it shifts to a higher gear, the noise returns.

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Unread 10-21-2010, 09:00 AM   #17
jlconlin
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Quote:
Originally Posted by freakinheep89 View Post
if its an RPM dependent whistle its probably a vacuum leak. check your IAC valve for proper adjustment, check all the vacuum lines to see if one is disconnected or cracked. The only other "whistle" I know of is the transmission at speeds due to restricted flow but thats usually due to a clogged filter and you changed that.

are you sure its a whistle? and not maybe a bearing whine? the idler pulleys make an interesting whine noise almost like a supercharger when they go bad.
It could definitely be a whine instead of a whistle. I'm going to try and see if I can isolate what is making the sound and report back.
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Unread 10-21-2010, 09:01 AM   #18
jlconlin
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Originally Posted by phitmein View Post
"are you sure its a whistle? and not maybe a bearing whine? the idler pulleys make an interesting whine noise almost like a supercharger when they go bad."

-------------------------------------------------------------------------------

A Very good point there Freak and the easy test there is to remove the belt/belts and start it,rev it and see if the noise is still present or not ...


Edit: Freak, let's not forget about power steering whines too ...
I'm pretty sure it's not a power steering whine. I've heard that before and it is different than what I'm hearing now.
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Unread 10-21-2010, 10:30 AM   #19
Tweaks
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I am having the same problem. It's been around for a long time (months) and I have just been way too busy to spend time going after it. I think mine is making noise from the pulley on my alternator. It used to squeak alot and was worse on rainy, damp days and now it just whines like it's supershraged. Does it in park and it's rpm dependent. Anyone else had this happen and had it be the alternator?
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Unread 10-21-2010, 02:48 PM   #20
freakinheep89
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Quote:
Originally Posted by jlconlin View Post
It could definitely be a whine instead of a whistle. I'm going to try and see if I can isolate what is making the sound and report back.
What motor do you have? 4.0 or 5.2?
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[QUOTE=slayercr23;12630497]How would i go about Stroking it?[/QUOTE]
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Unread 10-21-2010, 04:36 PM   #21
gothchick
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The noize you are hearing is the sound of the hidden turbo spooling up on selected models of 95' ZJs.










JK.
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Unread 10-21-2010, 04:58 PM   #22
jlconlin
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Originally Posted by freakinheep89 View Post
What motor do you have? 4.0 or 5.2?
I have a 1997 Grand Cherokee Laredo with 6 cylinders and a 4.0 liter engine. It also has the towing package, but I doubt that has anything to do with the current problem.
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Unread 10-21-2010, 05:08 PM   #23
freakinheep89
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Check the idler pulley, its the one that seems like it does nothing but spin. Also disconnect the belt and remove it, then start it and see if the noise is gone. that will let you know if its related to a pulley or a vacuum leak.
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[QUOTE=slayercr23;12630497]How would i go about Stroking it?[/QUOTE]
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Unread 10-21-2010, 05:41 PM   #24
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If it is a bearing do what Phit said with the stethiscope pipe, unless you have a real one.
That way you are not swapping out pulleys you don't need to.
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Unread 10-22-2010, 05:33 PM   #25
jlconlin
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So I bought a short PVC pipe to see if I could isolate where the noise is coming from and now I can't reliably reproduce it. I can still hear it, but it is intermittent. I have to keep playing with it to see if I can figure out what is wrong.
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Unread 10-23-2010, 02:32 AM   #26
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OK, you are going to be brave and use the PVC pipe instead of a hose ...

Not very smart, but that is how I have rolled many a time ...

Hose works better sometimes when you need to get to a sneaky place underneath and around something that a unflexable pipe won't reach ...

When I use hose, I go to Lowes or the like and buy the thin clear hose like on a fish tank, but I buy the big stuff with like a 1/2 inch ID ... It works like a champ ...

When you use your PVC pipe, be sure not to hold it straight out from your ear, but instead have it parallel to your face and ear ...

Go for it, but be very careful ...

Phit
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Unread 10-23-2010, 03:00 AM   #27
Falkon
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Quote:
Originally Posted by gothchick View Post
The noize you are hearing is the sound of the hidden turbo spooling up on selected models of 95' ZJs.
JK.


vehicle:car: engine: supercharger

Internal turbo
Internal Turbocharger
(+1, -3) [vote for,
against]



Maybe this sounds crazy -- but as any engine runs theres exhaust. And that flow of spent gasses already moves pretty quick. So in elimination of a need of a complex turbo, why cant we run the gas flow from the exhaust valves directly to the intake runners? This would improve efficiency of the engine while only adding minimal cost. Let me know if I am crazy but I think this would work as long as we could somehow add a Mass Air flow sensor so that the ecu knows how much fuel to dump in.
— Cardude, Jun 04 2008
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Unread 10-23-2010, 03:19 AM   #28
phitmein
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OK, I just re-read the whole thread here once again and I am thinking Freak is right on the pulley/bearing thing ...

Have you pulled off the belts yet, to see if it goes away when running ???

I saw, that you said, it starts making noise after 15 seconds and that maybe how long it takes for bad bearings to heat up and start complaining ... IMHO ...

I did not see you mention that the engine was acting differently/weird ...

A healthy/loud vacume leak would do that I think ...

Pull the belt/belts, spin everything that will spin easily with you hand and check for side play and end play etc. ...

Phit
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Unread 10-23-2010, 07:14 AM   #29
78fbta
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It could be the front pump in the tranny starvin for fluid,it will make the same noise.
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Unread 10-23-2010, 09:38 PM   #30
jlconlin
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I wish I could give you all an update, but as I said in an earlier post, I can't get the engine to whistle reliably. Since I can't reproduce the whistle when I want, I can't go searching for what is making the sound.

On the other hand, if it doesn't whistle anymore, that solves the problem right?
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