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Old 06-11-2012, 01:08 PM   #1
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Whistle Noise

Hello, I am a proud owner of a 2007 Jeep Wrangler. I am absolutely loving it up to this point (my last jeep was a 72 CJ5 when I was 16). However, there is something that is bugging me and I cant get an answer from any mechanic. I hear a high pitch whistle when I accelerate at a certain point. If I let off the accellerator or push it down more, it goes away. Happens in every gear (6 speed manual). The last mechanic that looked at it told me that it was the power-train and that it is normal and cant be fixed ANDbecause I have bigger tires on it, the sound will be more pronounced. Would like a second opinion. Any help would be appreciated. Thanks

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Old 06-11-2012, 01:21 PM   #2
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Same here. I've yet to figure it out.

At about 2k all the time.

Sounds like a intake whistle just not as loud as using a CAI.

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Old 06-11-2012, 01:24 PM   #3
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Listen closely, altenators have been known to do this. Its completely normal even though they all dont make the noise.
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Old 06-11-2012, 01:25 PM   #4
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Exactly! My girlfriend thought I was just hearing things.
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Old 06-11-2012, 01:26 PM   #5
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Quote:
Originally Posted by pkmcd99
Listen closely, altenators have been known to do this. Its completely normal even though they all dont make the noise.
Interesting. How would we know if it is the alt.

I assumed it was the intake
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Old 06-11-2012, 01:35 PM   #6
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Quote:
Originally Posted by kjeeper10

Interesting. How would we know if it is the alt.

I assumed it was the intake
Dont really know how you could verify without performing a road test scenario on a lift, but just another thing to listen out for.
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Old 06-11-2012, 01:38 PM   #7
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I read somewhere that it could be the weep hole?? Is that possible?
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Old 06-11-2012, 01:51 PM   #8
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Sounds like the same issue I've had forever now. See here: http://www.wranglerforum.com/f33/thi...ime-77633.html

No idea how to fix it. But it does it whenever I drive anywhere.
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Old 06-11-2012, 02:02 PM   #9
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one sec, do you guys have a throttle body installed? if so, that is why it whistles.
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Old 06-11-2012, 02:07 PM   #10
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one sec, do you guys have a throttle body installed? if so, that is why it whistles.
I do have a Viper throttle body. Not a throttle body SPACER mind you, but an actual replacement throttle body. (Here's my install thread with pics and the like.) I've thought it could be the culprit before, but I'm not sure why it would whistle more than the stocker?

In fact, looking over my old threads, I now recall that my whistle started BEFORE I installed the VTB, went away once I installed the VTB, and then came BACK shortly thereafter. I do have a CAI though as well, which I think preceded the appearance of the whistle altogether.
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Old 06-11-2012, 02:13 PM   #11
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Not me Pluke stock

I did hear a louder whistle with the Banks CAI on. This sounds similar just not as loud.
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Old 06-11-2012, 02:14 PM   #12
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To find out easy is to take a mechanic's stethoscope and put it on the alt to see if u can hear the noise if not then try the intake to see if u can hear it it should be Realy low volume at idle but should be their if u can't hear it then have a buddy hold the gas pedal at the rpm at where the noise is more pronounced and try again u should find it then
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Old 06-11-2012, 02:15 PM   #13
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Quote:
Originally Posted by MTH
Sounds like the same issue I've had forever now. See here: http://www.wranglerforum.com/f33/thi...ime-77633.html

No idea how to fix it. But it does it whenever I drive anywhere.
I totally missed that thread MTH.

Wow.... Never really gave it too much thought. I been meaning to search it out some or post but forget.

Same circumstances.

Edit: except no throttle body.
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Old 06-11-2012, 02:39 PM   #14
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MTH, you have a viper throttle body installed, is there performance benifits? Economy improvements? Tell me more.
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Old 06-11-2012, 02:52 PM   #15
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So I read the thread on viper tb, what news to tell us now about economy and performance and trouble codes? Any?
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Old 06-11-2012, 03:17 PM   #16
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Quote:
Originally Posted by MTH View Post
Sounds like the same issue I've had forever now. See here: http://www.wranglerforum.com/f33/thi...ime-77633.html

No idea how to fix it. But it does it whenever I drive anywhere.
This was a question I had for the mechanic (who said absolutist not), but now makes me think it does. My jeep came with a XDI air intake and I am thinking it may be the culprit. I don't have a stock one to swap and it only does it in gear so unless I can have my girlfriend ride on the hood is there anyway to find out if that is the problem?
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Old 06-11-2012, 03:19 PM   #17
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Quote:
Originally Posted by pkmcd99 View Post
MTH, you have a viper throttle body installed, is there performance benifits? Economy improvements? Tell me more.
Looking over my old thread, I described it this way:

Quote:
Originally Posted by MTH View Post
Results. I can't say I've gotten much more power. The results with my intake (again, here) were more pronounced in that regard. Gas mileage has also shown no change. However--and this is going to be hard to describe--the engine sounds and feels much, much smoother. The sense of laboring to progress through the sub-3500 RPMs is diminished greatly. The engine is also much quieter when up to speed. Simply put, the engine sounds and feels like it is having a much easier time hauling around this big 4 door JKU. In that sense, perhaps I have gotten some more power. More torque maybe. Hopefullly one of the resident engine buffs can explain. Incidentally, the switch also solved a "whistling" problem that had been driving me crazy. (See here.)
That still sounds about right. (Except for that last sentence about solving the whistling--that came back.) It's hard to tell now of course, as it's been so long that it's the "new normal."

Quote:
Originally Posted by pkmcd99 View Post
So I read the thread on viper tb, what news to tell us now about economy and performance and trouble codes? Any?
No codes. No problems. Runs great. Whether it's worth it though, I can't really say without swapping back in the old one. It's certainly not some sort of massive change, but it doesn't appear to cause problems.

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Originally Posted by jtaylor929 View Post
This was a question I had for the mechanic (who said absolutist not), but now makes me think it does. My jeep came with a XDI air intake and I am thinking it may be the culprit. I don't have a stock one to swap and it only does it in gear so unless I can have my girlfriend ride on the hood is there anyway to find out if that is the problem?
Pretty sure swapping in the stocker would be the best way to see if it's the culprit. I've thought about putting back the stock intake and throttle body, but . . . m'eh, I've got limited time to work on the jeep so reinstalling the stock stuff just to see if it gets rid of a whistle really isn't on my short list. Maybe some day.
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Old 06-11-2012, 10:09 PM   #18
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mine was doing this too and all it took for me was pulling out the throttle body spacer the guy before me had put on. unfortunately i was doing it with a friend and he cranked down one of my bolts too hard and it cracked the tb now i have the wistle permanently just not as loud. if it is that big of a deal to you just swap back to the stock one.
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Old 06-21-2012, 04:50 PM   #19
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UPDATE: I found a factory CAI and installed it. Sound has disappeared like a fart in a fan factory...at least for now. Thanks everybody!

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