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Unread 10-20-2010, 06:48 PM   #1
jlconlin
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What is that whistling/whining noise?

My 1997 Jeep Grand Cherokee has recently started making a whistling or whining noise. I'm worried it's indicative of something breaking and want to get it taken care of.

The noise is a high pitch and the pitch increases as the RPMs go up. As soon as the Jeep shifts to a higher gear, the RPMs go down and so does the pitch.

I changed the transmission fluid (and replaced the filter) over the weekend. Could a high pitch whistling noise come from the transmission? Does anyone have any experience with this?

Thanks,
Jeremy

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Unread 10-20-2010, 07:28 PM   #2
Nick_Knipp
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probable since its related to the speed of the gears, might wanna check with a transmission professional
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Unread 10-20-2010, 08:03 PM   #3
jlconlin
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Quote:
Originally Posted by Nick_Knipp View Post
probable since its related to the speed of the gears, might wanna check with a transmission professional
Don't tell me that; it sounds expensive. After posting, I did some searching online. There were several ideas from similar situations. Some said it was the intake manifold, vacuum leak, exhaust. Do any of those seem like it might be associated with the speed of the gears as well?

Thanks,
Jeremy
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Unread 10-20-2010, 08:05 PM   #4
Nick_Knipp
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no idea man, i never encountered that problem
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Unread 10-20-2010, 08:15 PM   #5
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try reving the motor while it is in park and see if it makes the noise there too ...
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Unread 10-20-2010, 08:24 PM   #6
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Hey Im new to forum dont really know how to navigate site yet but I have some questions so here goes. I have a 98 grand lmted with a 5.9 want to swap 249 for 242, have read many threads but want to know if there is truly a "bolt on" 242 and if so what year is most compatible, I have been to local bone yard and they have many. Please help!
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Unread 10-20-2010, 08:37 PM   #7
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^^^Dude look at the FAQ's!!

OP Do you have any kind of intake on it? I put a cone filter on the end of mine and it whistles. Rev it a little when your under the hood and see if you cant hear it then?
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Unread 10-20-2010, 08:46 PM   #8
jlconlin
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Originally Posted by phitmein View Post
try reving the motor while it is in park and see if it makes the noise there too ...
Just tried it and yep, it whistles while in park as well. It took about 1015 seconds of running before it started to make noise, but that seems rather insignificant. My wife said she could hear the noise all the way in the house. Does the fact that is also makes a noise even when in park mean it's not the transmission?
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Unread 10-20-2010, 08:55 PM   #9
Nick_Knipp
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yup it wasnt transmission, sorry about that =)
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Unread 10-20-2010, 09:00 PM   #10
jlconlin
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yup it wasnt transmission, sorry about that =)
No need to apologize. It's nice to remove one possibility. I can usually fix a problem if someone tells me what needs to be done; it's just figuring out what the problem is that I'm no good at.
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Unread 10-20-2010, 09:05 PM   #11
Nick_Knipp
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u and me both, ur talking to a guy who spent 2 weeks on the front driveshaft

i should keep in mind to get a warranty and a mechanic on my next jeep purchase
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Unread 10-20-2010, 09:10 PM   #12
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Take a piece of rubber hose and use it as a stethohoscope to find the noise ...

I am leaning towards a vacume leak at this point ...

I will use PVC pipe as a stethoscope too but either way be damn careful with it around a running motor ...
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Unread 10-20-2010, 10:14 PM   #13
KennzX
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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?
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Unread 10-20-2010, 11:03 PM   #14
freakinheep89
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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.
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Unread 10-20-2010, 11:17 PM   #15
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"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."

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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 ...

Didn't you have PS probs once ???

Phit
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