Grinding on take off
09-30-2015, 10:31 AM
#16
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Year: 2001
Model: Cherokee
Engine: 4.0
Hello, so I have been having a problem with my 98 XJ. So occasionally when I take off from a dead stop on medium to hard acceleration there is a grinding noise that sounds like it's coming from directly below me. It's a 4.0 with an AW4 and NP231 tcase. 202k miles. It does not do it on a grandma take off or if I slam the gas when already moving. It's also very inconsistent. It will do it at one red light but not the next. ??? I have already searched but haven't found my exact problem. I recently changed the transmission mount. Tcase fluid is at level. Needs changed and I will do that next weekend but it's at the correct level. This is in 2wd. Haven't tried in 4wd. Any advice would be appreciated. It only grinds on acceleration and not when moving.
10-01-2015, 01:29 PM
#20
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Year: 2000
Model: Cherokee
Engine: 4.0
The only u-joint if found with any play at all is the one connecting the transfer case to front drive shaft. And it's amount of play is tiny. Is that all it takes? I have not checked the axle u-joints however.
10-01-2015, 07:02 PM
#22
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Year: 1998
Model: Cherokee
Engine: 4.0
10-13-2015, 05:06 PM
#24
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Year: 2000
Model: Cherokee
Engine: 4.0
I thought I would post my findings. The problem was that my idler pulley was hitting my E fan. Every time I accelerated the engine would move and hit the fan. So now I ask is this caused by bad motor mounts?
10-13-2015, 05:50 PM
#26
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Year: 1997
Model: Cherokee
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That would be my guess, but you must have "NO" rubber left in them for that.....?
10-13-2015, 09:03 PM
#27
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Year: 2000
Model: Cherokee
Engine: 4.0
Busted mounts. I did the trans a couple weeks ago. It's totally cracked completely thru. Replacing them after school tomorrow.
Last edited by jpmarine6786; 10-13-2015 at 09:05 PM.
10-16-2015, 03:24 PM
#29
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Year: 2000
Model: Cherokee
Engine: 4.0L
This could be the common "loose torque converter bolts" issue. There's 4 bolts that hold the flex plate (attached to the back of the crank) to the torque converter where the engine and trans meet. They sometimes work themselves loose and cause a clanking noise that sounds like its coming from under the floor.
There's a black lower cover/shield at the bottom of the bellhousing that you can remove and check to see if the bolts are loose.
Not saying that's your problem, but it could be. Do you hear any noise when just idling?
EDIT: For some reason I didn't see page 2 of this thread before posting this, just ignore this post lol. Glad you found your problem
There's a black lower cover/shield at the bottom of the bellhousing that you can remove and check to see if the bolts are loose.
Not saying that's your problem, but it could be. Do you hear any noise when just idling?
EDIT: For some reason I didn't see page 2 of this thread before posting this, just ignore this post lol. Glad you found your problem
Last edited by t.mcginley.jr; 10-19-2015 at 02:52 PM.
10-19-2015, 02:41 PM
#30
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Year: 2000
Model: Cherokee
Engine: 4.0
So the grinding has permanently damaged my e fan so I need a new one, and I replaced that in June. :/
Thanks for all the help guys.
Thanks for all the help guys.