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Author Topic: Throttle Body Whistle?  (Read 1034 times)

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CrashTestRacer

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Throttle Body Whistle?
« on: February 18, 2009, 09:49:23 AM »
I just installed the 4.0L tb on my tj and it works great but it has this really annoying whistle somewhere around 20-30% throttle. Has anyone else had this problem or know a way to fix it? I was considering porting the manifild i dont know if that would help?
 
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TN00TJ

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Re: Throttle Body Whistle?
« Reply #1 on: February 18, 2009, 11:04:11 AM »
Mine is totally stock (for now) and has done it mostly between idle and 1500 turns. I love it. Sounds like a turbo to me. 

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Offline Bounty Hunter

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Re: Throttle Body Whistle?
« Reply #2 on: February 18, 2009, 01:41:05 PM »
The only time I've noticed a whistle is when replacing the stock intake tube with an aftermarket tube and conical filter.  Simply changing from a 2.5 TB to a 4.0 TB shouldn't have caused a whistle by itself.
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Crunch

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Re: Throttle Body Whistle?
« Reply #3 on: February 18, 2009, 02:15:34 PM »
Unless you have a leak somewhere maybe ;)
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Offline VA_YJ

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Re: Throttle Body Whistle?
« Reply #4 on: February 18, 2009, 02:57:12 PM »
Maybe the IAC gasket is leaking?
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95 YJ, 31 BFG ATs, 4.0 TB & spacer, Banks header, DynoMax CAT back, 19# inj, AEM CAI, 20 gal mod, Optima yellow
98 TJ, 35 BFG Krawlers, 4.0 liter, ax15, atlas 5:1, armor, Super 88 (under construction)
96 XJ Cheep Cherokee, 33s, 4.0 liter, AW4, future project
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GTChrisB

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Re: Throttle Body Whistle?
« Reply #5 on: February 20, 2009, 06:17:15 PM »
Get an intake for it and it will make a "woosh" sound too.  Kind of sounds like a turbo like TN00TJ said. 
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Offline FourbangerYJ

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Re: Throttle Body Whistle?
« Reply #6 on: February 20, 2009, 09:54:39 PM »
Quote from: CrashTestRacer on February 18, 2009, 09:49:23 AM
I just installed the 4.0L tb on my tj and it works great but it has this really annoying whistle somewhere around 20-30% throttle. Has anyone else had this problem or know a way to fix it? I was considering porting the manifild i dont know if that would help?
 
Mine does the same thing with the 62mm TB. It's not that loud, I notice it but it's not annoying. I also have a Rock-it City intake tube with K&N.
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Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

CrashTestRacer

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Re: Throttle Body Whistle?
« Reply #7 on: February 20, 2009, 11:08:20 PM »
yea i forgot to metion I am also running a cone filter which is probably why its so noticable. I'll see what happens when I port the manifold if all else fails I'll just throw the stock airbox back in.
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Offline Bounty Hunter

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Re: Throttle Body Whistle?
« Reply #8 on: February 21, 2009, 12:18:57 PM »
Quote from: CrashTestRacer on February 20, 2009, 11:08:20 PM
yea i forgot to metion I am also running a cone filter which is probably why its so noticable. I'll see what happens when I port the manifold if all else fails I'll just throw the stock airbox back in.
It's the airtube and filter, as the stock setup is designed to dampen the intake noise.  Why is it so bothersome that you would go back to a stock intake?
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