Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: stuffed_in_a_locker on May 01, 2006, 10:34:30 AM

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: stuffed_in_a_locker 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.

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: cLAY 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.

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: stuffed_in_a_locker 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.

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: kounoupis 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.

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: stuffed_in_a_locker 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?

Title: engine hiss at 3200 rpm and up. 4.0 tj
Post by: kounoupis on May 05, 2006, 12:53:28 PM

I ended up replacing mine. I think the mud might of ate it.  :wink: