Weird noise at 3k-3.5k rpm
#1
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Year: 1998
Model: Cherokee
Engine: 4.0L I6
Weird noise at 3k-3.5k rpm
noticed this a while ago with my XJ, whenever I get my engine up to about 3k rpm and let of the gas a little the engine makes a very loud noise that sounds pretty much like a roaring. I don't know if it's normal or not, but if I just keep accelerating it won't make the noise, so I'm assuming it's not normal. I'll see if I can get a vid but it usually only does it if I am going up a slight incline around 35-40 mph at 3k+ rpm.
EDIT: The best way I can actually describe the noise is that it sounds like a Jake brake on a semi but at a little bit higher pitch and faster rhythm.
EDIT: The best way I can actually describe the noise is that it sounds like a Jake brake on a semi but at a little bit higher pitch and faster rhythm.
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Year: 2001
Model: Cherokee
Engine: 4.0L 6cyl
i had the same problem a few months ago with the roaring at 35-40 and it turned out my u-joints were bad so i got them replaced and havent heard anything since.
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Year: 1998
Model: Cherokee
Engine: 4.0L I6
also, the thing is it only does it at a certain RPM when going uphill, and sometimes at a certain speed. If I'm on flat road and keep accelerating it will never make the noise
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Year: 2001
Model: Cherokee
Engine: 4.0L 6cyl
Originally Posted by Griff94
The U-joints? Never would have expected that. I'll have to check it out...but just in case does anyone else have any suggestions?
also, the thing is it only does it at a certain RPM when going uphill, and sometimes at a certain speed. If I'm on flat road and keep accelerating it will never make the noise
also, the thing is it only does it at a certain RPM when going uphill, and sometimes at a certain speed. If I'm on flat road and keep accelerating it will never make the noise
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Year: 1998
Model: Cherokee
Engine: 4.0L I6
Yeah when my u-joints started going bad I guess the angle of going up combined with the loosening u-joints let then have alot more play so it caused the roaring. But don't make the same mistake I did. I let them sit for a while and they got loose enough where on the flat roads between 35-40 they would roar.
EDIT: accidentally put Seconds instead of minutes
Last edited by Griff94; 01-31-2012 at 08:25 PM.
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#9
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Year: 1998
Model: Cherokee
Engine: 4.0L I6
I shouldn't actually say "cold". It's only when I first start running. The temp is up around 210 which is the running temp (as you obviously know :P). It's only when I first start to drive and its only when I go uphill in a lower gear (automatic). It actually stopped doing it, so as of now I'm not worried until it starts up again. And if something does go wrong, I have a powertrain warranty (not sure when it expires)
Last edited by Griff94; 01-31-2012 at 08:26 PM.
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