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Author Topic: Hissing Noise  (Read 2656 times)

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Steve-0

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Hissing Noise
« on: November 16, 2009, 08:57:42 PM »
Just wondering if anyone ever heard a hissing or whistling noise under the hood? I get this noise that sounds like air being restricted at about 1/3 throttle position. Doesnt matter how fast or slow I am going, but it seems like it only happens (or is loud enough to hear) at higher RPMs, like around 2500 +. It has not done anything to my performance, nothing to really worry about whatsoever, just curious to know what the heck it is. I thought it might have something to do with the cold air intake on the 4banger, but not sure. Anyone else hear that noise? Figure out what it was?
« Last Edit: November 16, 2009, 09:00:25 PM by Steve-0 »
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Offline sharpxmen

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Re: Hissing Noise
« Reply #1 on: November 16, 2009, 09:35:49 PM »
Quote from: Steve-0 on November 16, 2009, 08:57:42 PM
Just wondering if anyone ever heard a hissing or whistling noise under the hood? I get this noise that sounds like air being restricted at about 1/3 throttle position. Doesnt matter how fast or slow I am going, but it seems like it only happens (or is loud enough to hear) at higher RPMs, like around 2500 +. It has not done anything to my performance, nothing to really worry about whatsoever, just curious to know what the heck it is. I thought it might have something to do with the cold air intake on the 4banger, but not sure. Anyone else hear that noise? Figure out what it was?

do you have a high flow or cone type filter? if yes that's why you hear it.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Steve-0

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Re: Hissing Noise
« Reply #2 on: November 16, 2009, 11:09:18 PM »
Cone. I hear a whistling sound at about 1/3 throttle. Its always the same throttle position. It seems more noticeable near 2300 and above. I cant hear it below that. When I throttle past it, it almost sounds like a little blow-off valve.
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Offline sharpxmen

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Re: Hissing Noise
« Reply #3 on: November 17, 2009, 01:19:25 AM »
Quote from: Steve-0 on November 16, 2009, 11:09:18 PM
Cone. I hear a whistling sound at about 1/3 throttle. Its always the same throttle position. It seems more noticeable near 2300 and above. I cant hear it below that. When I throttle past it, it almost sounds like a little blow-off valve.

same here, came with the cone filter and the 4.0L t/b - can't remember what position was at but somewhere in the lines of what you said. It's normal, nothing to worry about.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline Bounty Hunter

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Re: Hissing Noise
« Reply #4 on: November 17, 2009, 02:23:59 AM »
It's normal, install more aggressive tires and you may not hear it any more.
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TrailsLessTaken

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Re: Hissing Noise
« Reply #5 on: November 17, 2009, 08:13:20 AM »
just turn the music up a lil more until the noise goes away  :wall:
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Offline jfrabat

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Re: Hissing Noise
« Reply #6 on: November 17, 2009, 10:45:52 AM »
Quote from: TrailsLessTaken on November 17, 2009, 08:13:20 AM
just turn the music up a lil more until the noise goes away  :wall:

See, I like this approach better than the aggressive tires.  And if your sound system is not up to par, an even BETTER approach is to go out and buy a SONY sound system, complete with head unit, speakers, amp and sub and install it in your Jeep... 
« Last Edit: November 17, 2009, 10:46:27 AM by jfrabat »
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Offline chardrc

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Re: Hissing Noise
« Reply #7 on: November 17, 2009, 11:01:59 AM »
Quote from: jfrabat on November 17, 2009, 10:45:52 AM
an even BETTER approach is to go out and buy a SONY sound system, complete with head unit, speakers, amp and sub and install it in your Jeep... 

maybe if you (could) set up a 4bangerjp discount your nagging would pay off more often...  :pot:
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Offline jfrabat

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Re: Hissing Noise
« Reply #8 on: November 17, 2009, 12:18:25 PM »
Quote from: chardrc on November 17, 2009, 11:01:59 AM
maybe if you (could) set up a 4bangerjp discount your nagging would pay off more often...  :pot:

How about 2 for the price of 2?  Nah, honestly I would be happy to set you guys up, but I am in the Latin America division, so I have no contacts in Sony Electronics (US division).  To those in Latin America, I can probably hook you up (I think TSD is in Chile, right?  Anyone else?) with some discounts, but it's a bit harder for those in the US.  Sorry!
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Offline stan98tj

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Re: Hissing Noise
« Reply #9 on: November 17, 2009, 02:06:54 PM »
Quote from: Steve-0 on November 16, 2009, 11:09:18 PM
Cone. I hear a whistling sound at about 1/3 throttle. Its always the same throttle position. It seems more noticeable near 2300 and above. I cant hear it below that. When I throttle past it, it almost sounds like a little blow-off valve.
i get the same thing from my AEM. i dont recall what the exact RPMs are where the sound is noticable...to be quite honest, i kind of like it.
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Steve-0

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Re: Hissing Noise
« Reply #10 on: November 17, 2009, 07:49:50 PM »
Yeah, I have the 3-way speaker bar, the dash 4x6's and a 10" kicker comp. Not a raging system, but its loud enough for me, I just turn it up to drown it out, or not. Sometimes I just listen to it. I also kind of like it. Reminds me of a turbo sound effect in a way. By the way, since we are talking about intake, I was contemplating pointing my intake over to the passenger side of the engine bay area instead of down the front behind the driver side headlight. Only reason for me to do this would be to avoid water/mud puddles a bit better. Do you think its worth it?
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Offline dwtaylorpdx

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Re: Hissing Noise
« Reply #11 on: November 19, 2009, 02:17:35 AM »
I've had this happen when the clamp for the air tube on the throttle body got loose...

Dave
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94 YJ - 2.5 Hesco Cam B&B Ported - AX5 Trans w/Centerforce Dual Friction Clutch - 4" Rough Country Lift W/Skyjacker Shocks - D44 Rear/ARB - D30/ARB - ARB Compressor - Warn M8000 in Custom Bumper - Reunell Rear Bumper - Metalcloak 6" Body Armor Kit - Tuffy Console - 265x85-16 Tires - 2M Radio

TrailsLessTaken

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Re: Hissing Noise
« Reply #12 on: November 19, 2009, 08:28:00 AM »
Quote from: jfrabat on November 17, 2009, 10:45:52 AM
See, I like this approach better than the aggressive tires.  And if your sound system is not up to par, an even BETTER approach is to go out and buy a SONY sound system, complete with head unit, speakers, amp and sub and install it in your Jeep... 

I don't know about Sony  :stick: but im looking forward to my DLS and Arc Audio setup thats going in my truck next summer from Audio Shoppe  :dance:
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Offline jfrabat

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Re: Hissing Noise
« Reply #13 on: November 19, 2009, 03:06:40 PM »
Honestly speaking, if you plan to listen to your stereo (regardless of brand) on a Jeep with no top, you better get something with good sound power...  At least (in my opinion) something with a subwoofer.  Otherwise, the music will be simply drowned out.
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Offline dwtaylorpdx

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Re: Hissing Noise
« Reply #14 on: November 19, 2009, 10:10:04 PM »
I have Tuffy boxes with 6x9 and Sony Plates in the front dash holes,
and a standard Sony head unit, nothing fancy. You can hear it fine. (And my hearing is not great)
Putting money in a stereo on a vehicle without a top always seemed somehow wrong...

Dave
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94 YJ - 2.5 Hesco Cam B&B Ported - AX5 Trans w/Centerforce Dual Friction Clutch - 4" Rough Country Lift W/Skyjacker Shocks - D44 Rear/ARB - D30/ARB - ARB Compressor - Warn M8000 in Custom Bumper - Reunell Rear Bumper - Metalcloak 6" Body Armor Kit - Tuffy Console - 265x85-16 Tires - 2M Radio
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