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Author Topic: engine hiss at 3200 rpm and up. 4.0 tj  (Read 1557 times)

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stuffed_in_a_locker

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engine hiss at 3200 rpm and up. 4.0 tj
« on: May 01, 2006, 10:34:30 AM »
i get an engine hiss at 3200 rpm and up. dont know where it's coming from and was wondering if anyone else has or is experiencing this.
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Offline cLAY

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engine hiss at 3200 rpm and up. 4.0 tj
« Reply #1 on: May 01, 2006, 02:57:23 PM »
I had a hiss when my CAT broke up and plugged the exhaust, this caused a back pressure which escaped by melting out the EGR. I was also very low on power and had horrible fuel economy.
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..

'93 ZJ, 5.2L, lifted/locked/36s..<gone>
'98 5.9er 4.10s,locked,LA,WJ knuckles

stuffed_in_a_locker

  • Guest
engine hiss at 3200 rpm and up. 4.0 tj
« Reply #2 on: May 02, 2006, 02:37:37 PM »
it sounds like it's coming from the engine somewhere and it only does it at higher rpm. i dont feel any sort of power loss either.
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kounoupis

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engine hiss at 3200 rpm and up. 4.0 tj
« Reply #3 on: May 03, 2006, 03:00:24 PM »
I had a similar noise coming from my TJ a few years back and it turned out to be the belt tensioner. I remember letting off the gas and putting it in neteral and the noise was still there till it would fade away. It was kind of like a haunting howling noise that only came around when i was doing 110 km on the speedo.
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stuffed_in_a_locker

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engine hiss at 3200 rpm and up. 4.0 tj
« Reply #4 on: May 04, 2006, 09:08:08 AM »
it does sound like it could be coming from the tensioner. did you have to replace it or did you just pack it with grease?
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kounoupis

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engine hiss at 3200 rpm and up. 4.0 tj
« Reply #5 on: May 05, 2006, 12:53:28 PM »
I ended up replacing mine. I think the mud might of ate it.  :wink:
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