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Unread 08-17-2012, 09:56 PM   #1
ZIMM18
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Squealing/whistling noise under load

Posted over on JK forum too to get other insight as well. Whats your all thoughts on this?



Long story short, my dad was going to trade in his low miles 07 rubi (21,000) for a 12 because it started squealing under load at mid throttle and 3 dealers couldnt find the cause. He offered it cheap to me, lower than the dealer was going to give him. They thought it was like a throw out bearing, or clutch disc problem. Only happened under 1/2 throttle right around 1500-2000rpm, most noticeable in 4th gear or higher. When the noise occurred, if you rapidly depressed the throttle or let off of it the noise would go away instantly. Clutch never slipped or seemed to have any problems.


Fast forward to today after using my Chassis ears which are remote transmitters that you connect clamps to places you think make noise and you can track down the problem. I think a must for every Jeep owner! hahaha. Anyways, I started with the running grear, trans, bell housing, transfer case and nothing..........Kinda sounded like a intake suction noise in a way....So I threw all 6 sensor clamps on the plastic intake and BOOM found my noise in the intake tract. Now what? Why is whistling/squealing all the sudden, small vacuum leak? I did a BG throttle body cleaning and still the noise......Jeep has a AEM intake but my Dad said it starting making the noise somewhat before the install.

Anybody make an all aluminum intake? Maybe throw one of those tornado spirals in the intake tube?









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Unread 08-17-2012, 10:36 PM   #2
mongorunner
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When you say its a sqeal like noise, does it kind of mimic a exhaust gasket leak?
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Unread 08-17-2012, 10:44 PM   #3
ZIMM18
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Quote:
Originally Posted by mongorunner View Post
When you say its a sqeal like noise, does it kind of mimic a exhaust gasket leak?
i know what an exhaust leak sounds like. This is more like a whistling suction squeal sound. Almost like a dry bearing noise in a way. not a puffing exhaust leak.
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Unread 08-18-2012, 05:46 AM   #4
Prot
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Tensioner pulley is one possibility.

Any chance of putting the stock intake back on?
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Unread 08-18-2012, 07:39 AM   #5
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Like Prot suggests--Could be Tension pulley bushing/water pump pulley bushing/Alternator pulley bushing -

I've never heard of an inyake manifold causing a "squeling"-

Good luck

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Unread 08-18-2012, 07:51 AM   #6
rirrgang
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Why didn't you help out your dad with your equipment before he sold it to you?
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Unread 08-18-2012, 08:06 AM   #7
Prot
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Quote:
Originally Posted by JIMBOX
Like Prot suggests--Could be Tension pulley bushing/water pump pulley bushing/Alternator pulley bushing -

I've never heard of an inyake manifold causing a "squeling"-

Good luck

JIMBO
Cold air intakes make funky sounds on the 3.8L which has been described in various ways including like a cat being skinned alive.

Cold air intake, not the intake manifold.
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Unread 08-18-2012, 08:32 AM   #8
JIMBOX
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Yeah, I've heard of different "whooshing/whistling sounds", but not squealing sounds--and


Quote:
Originally Posted by Prot View Post
Cold air intakes make funky sounds on the 3.8L which has been described in various ways including like a cat being skinned alive.

Cold air intake, not the intake manifold.
We can't hearit, so I hope he finds the culprit !

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Unread 08-18-2012, 08:45 AM   #9
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Quote:
Originally Posted by JIMBOX
Yeah, I've heard of different "whooshing/whistling sounds", but not squealing sounds--and

We can't hearit, so I hope he finds the culprit !

JIMBO
Hope he has the lobes for it.

(nerdy Ferengi reference)
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Unread 08-18-2012, 03:46 PM   #10
ZIMM18
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Thanks for the input. My dad is mailing me the stock intake so I can try that. Tensioner or water pump or bearing would squeal all the time you think or change with rpm. This is just a quick whistling kinda sound just at a certain rpm and only at 1/2 throttle as posted above. I tried to make 5 gopro vids from the engine compartment to the drivers seat but it can't pick up the noise for some reason. I'll keep trying it in diff places this weekend to see if it will catch it.
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Unread 08-18-2012, 03:47 PM   #11
ZIMM18
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Quote:
Originally Posted by rirrgang View Post
Why didn't you help out your dad with your equipment before he sold it to you?
He lives in VA, I'm 6000 miles away in Hawaii
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Unread 01-02-2013, 07:38 AM   #12
David64
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Status? I am having the same issue, 2000 Sahara 4.0L with K&N cold-air intake. The cold air has been installed over 3 years, the "whistling" sound only recently started. I'm pulling my hair out trying to identify it. Mechanic friends say doubtful clutch related. Water pump, fan clutch, and idler pulley 6 months ago new. Have not replaced tensioner pulley.... yet, but I was starting to lean towards that when I came across this thread.
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