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Old 12-01-2009, 09:10 AM   #1
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My '94 is making a loud whistling sound when you're driving

My 94 YJ has just started making a very loud whistling sound while your driving and it only does it while your moving and if you push in the clutch it temporarily quits but starts right back and it is loud. So loud in fact that it drounds out the radio or outside noise. It sorta sounds like engine noise coming through a speaker, the faster you go the louder it gets. Anyone got an idea?

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Old 12-01-2009, 10:11 AM   #2
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Does the whine increase with RPMs? Or with the actual speed of the jeep?

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Old 12-01-2009, 11:52 AM   #3
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Does the whine increase with RPMs? Or with the actual speed of the jeep?
It's with the RPM but naturally the faster you go the higher the RPM's ya know? Do you have any clue?
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Old 12-01-2009, 03:38 PM   #4
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Belt squeal? Shorted wire causing the noise to actually come through the speaker? Loose air intake? Does it increase when you rev it? or only under load?
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Old 12-02-2009, 09:16 AM   #5
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Belt squeal? Shorted wire causing the noise to actually come through the speaker? Loose air intake? Does it increase when you rev it? or only under load?
It's not a belt squeal, it is as if it's engine noise coming through the speaker but thats not what it is and yes it does get louder with higher RPM's but as soon as you engage the clutch it quits until you release it.
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Old 12-02-2009, 10:04 AM   #6
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Sounds like spark interference with the radio,Had the same problem with an old chevy.Get some radio suppression plug wires,and see if that cures the problem.
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Old 12-02-2009, 10:27 AM   #7
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It's hard to diagnose sounds over the intenet, but could it be the clutch bearing going bad? Do you get shudder when engaging the clutch?
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Old 12-02-2009, 10:27 AM   #8
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You sure its NOT coming from your speakers?? If your stereo is grounded to somewhere on your chassis (I.E. ashtray frame etc.) then you are getting interference from your engine.
You could try resistor plugs and see if the noise decreases or maybe even goes away.
If it does decrease then look for a new ground and some suppresion wires for your plugs.
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Old 12-02-2009, 10:35 AM   #9
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Or it could be like Redwrangler says, your clutch bearing could be going bad which would make more of a high pitched whine than a whistle and I don`t think you would hear it through your speakers but again, like he said, it`s really hard to diagnose sounds over the internet.
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Old 12-02-2009, 11:53 AM   #10
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Well I'm thinking it's not an electronic problem because it just started out of the blue this week. It has never made any sound like this is before and the sound appears to be coming through the defrost vent on the passenger side which lead to me to believe that it may be the blower motor but who knows but for about three weeks now I have been having terrible alternator problems with my voltage meter jumping from 9 volts all the way up to 15 so maybe a bearing or something is going down in the alternator. Is that possibe?
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Old 12-02-2009, 09:09 PM   #11
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I guess i got the weak one is all I know. LOL
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Old 12-03-2009, 10:33 AM   #12
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If your alternator bushing was going out, you would hear it, thats for sure, are you checking your voltage when its under load or no because if its hopping all over the place all the time, (this is just a guess but maybe its your voltage regulator or something of that nature)
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Old 12-07-2009, 09:09 AM   #13
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Well the volatge meter is at times all over the place and the check engine will come on when it drops down to around 9 volts but just like today drove into work and maintained about 12-14 volts and no noise. Go figure???
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Old 12-07-2009, 11:39 AM   #14
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I had a very similar problem, and thought it was my alternator. Replaced the belt with a dayco kevlar-coated belt, and sprayed down the pulleys with brake cleaner incase there was any lubricants on them when the belt was off... no check engine light now, because the voltage stays way up at 14.5 where it should be. It started just being low and squeeling for a few seconds, then stopping..gradually over a month or two, maybe three, it turned into an all the time ordeal.

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