High Pitched Whistling Noise when Accelerateing - Jeep Wrangler Forum

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Old 12-11-2012, 07:22 PM   #1
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High Pitched Whistling Noise when Accelerateing

2002 TJ 4.0L 142k Miles

Ever since I went to Silver Lake Last summer I started to notice that when I accelerate hard from Idle or at low speeds, until it gets up to moderate speeds (40+) it will make a high pitched noise, almost like a turbo sound. I've been having a hard time diagnosing where it is coming from, and from my knowledge, it isn't effecting anything, I am just mealy wondering if this is should be something to be concerned about or not and if anyone else has experienced this problem?

Way back in June when I went to SL after the trip and I got home my Check Engine light came on for my "Torque Converter" but eventually the code went away a day later and has yet to ever come on again. So I thought the noise may be from the transmission, but the light hasnt come on since. Not to mention, my fluid is fine, the trans stays at normal operating temps, and shifts perfectly.

I started thinking it may be my fuel pump, cause that was making a noise even at idle and was going, but I changed that out 3 days ago (Carter Assembly) and that idle noise has gone away. Yet when I hard accelerate, the noise persists.

I do have a K&N Cold Air Intake so I am beginning to wonder if this thing typically makes this turbo like sound noise when you hard accelerate?

Other than that, It doesnt seem to cause any problems, I was just curious if anyone else has experienced this noise and might know what the source is?

Thanks!
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Old 12-11-2012, 07:28 PM   #2
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Do you have an aftermarket throttle body?

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Old 12-11-2012, 07:35 PM   #3
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Do you have an aftermarket throttle body?
No I do not, just the K&N, and Back Cat system
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Old 12-11-2012, 08:17 PM   #4
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You can hear a cold air sucking in air if you have a fairly quiet engine and tires
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Old 12-11-2012, 08:33 PM   #5
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Possibly a vacuum leak somewhere? Check all your lines and make sure they are connected and not cracked anywhere.
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Old 12-11-2012, 08:47 PM   #6
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Possibly a vacuum leak somewhere? Check all your lines and make sure they are connected and not cracked anywhere.
I will check all lines tomorrow, I also noticed today that my cruise control is not working, but the dash light emits. So I am assumeing that the vaccume line is unplugged somewhere. However, I was having this noise back when my cruise control worked. But I will check all lines.
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Old 04-21-2013, 09:21 AM   #7
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Have you found anything new on this? Just wondering because my Wrangler does the same thing every so often.
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Old 04-21-2013, 10:14 AM   #8
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I heard a high pitch whine or squeal all the time after it would warm up a little. Turned out the be the intake manifold wasn't on correctly.
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Old 04-21-2013, 10:29 AM   #9
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I have this noise too! After I cleaned out my throttle body. Just haven't had time to figure it out.
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Old 04-21-2013, 11:59 AM   #10
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could be an a intake leak or vacuum leak. I did have an alternator do the same thing. good luck
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Old 04-21-2013, 12:31 PM   #11
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High pitch noise

I have this problem on my 01 60th. I researched this to find it could be a loose bolt on the manifold near the firewall. I will try it on mine today and let you know if that is what it was.
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Old 10-02-2014, 01:15 PM   #12
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Was the bolt on the manifold your issue?
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Old 10-02-2014, 04:34 PM   #13
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Just fixed this problem today. On the drivers side there is a nipple in the intake manifold that goes to a black elbow. mine was cracked and my cruise didn't work and it whistled. I bet if you also check your mixer door isn't working on your heater either as it is vacuum actuated.
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Old 09-28-2015, 11:10 PM   #14
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I had this same issue, high-pitched whining/whistle at certain RPMs.

Mine was my alternator going out. The noise lasted about 2 weeks, then one day the "battery warning" light came on on my way home, next morning the entire thing was dead. I opened the hood and there were scorch marks all over the alternator and the distinct smell of burning plastic.

Had to replace both the alternator and the battery. My brother (a mechanic for Audi) said the battery might have been the root cause the entire time. The battery was at 5 VDC when measured, so he thinks the battery was trying to charge the entire time but couldn't, which over-loaded the alternator causing it to... detonate.

Check the voltage on your battery, it can't hurt.
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Old 09-28-2015, 11:39 PM   #15
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I bet if you also check your mixer door isn't working on your heater either as it is vacuum actuated.
Sure about that?
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Old 09-29-2015, 01:15 AM   #16
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I have had this whistle while accelerating fast for the whole time I've owned my jeep, a year. I'm pretty sure mine is just my air intake as it is aftermarket and makes the same sound when I rev the engine under the hood. It's just air being sucked in. I also have a throttle body spacer so that may affect it too.

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