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Unread 12-26-2012, 09:23 PM   #1
Truitt
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1980 CJ7 
 
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99 xj studders on take off.

I have a 99 xj. With a 4.0 and an automatic. It's lifted about 3inches but no SYE. It shudders when I take off from a stop at full throttle. It doesn't do it if I take off slower. Its a short, slow shudder not a quick vibration. What would cause this? Maybe some sort of torque management, like anti-slip or something? I just got it and everything else seems ok. I just don't know much about Cherokees. I have been a cj fan for a long time.

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Unread 12-26-2012, 09:35 PM   #2
Project1
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Do you have a drag jeep like this one ? Could be wheel hop ... maybe some race slicks??
p5070023.jpg  
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Unread 12-26-2012, 09:37 PM   #3
Project1
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Im just kiddin .. do you feel like its an engine prob? getting any codes??


Could just be some wheel hop or maybe a broken motor mount or shackle ... do you get any kind of clicking when you turn? Maybe the best thing is to take a good look at your jeep and see if any looks broken, like any bushings and make sure everything is nice and tight ... low tech before hi tech
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Unread 12-26-2012, 09:38 PM   #4
Truitt
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Nope, I'm kinda proud to say its not quite like that one. But I would be cool if it were making enough power to cause wheel hop!
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Unread 12-26-2012, 09:43 PM   #5
Project1
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Originally Posted by Truitt View Post
Nope, I'm kinda proud to say its not quite like that one. But I would be cool if it were making enough power to cause wheel hop!
I know that would be awesome... mine will spin out eassssy ( but thats just because my tires suck )
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Unread 12-26-2012, 09:44 PM   #6
Truitt
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I don't really thing is an engine problem. It runs really smooth the whole time. No engine codes at all. I feel like its a drivetrain thing. But it doesn't make sense to me that I doesn't do it all the time or become worse at highway speed.
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Unread 12-26-2012, 09:49 PM   #7
Project1
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Originally Posted by Truitt View Post
I don't really thing is an engine problem. It runs really smooth the whole time. No engine codes at all. I feel like its a drivetrain thing. But it doesn't make sense to me that I doesn't do it all the time or become worse at highway speed.
Might be something small that shows when you get under some torque. full speed from a stand still puts a lot of stress on everything...

I would check for things that are broken or lose
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Unread 12-26-2012, 10:29 PM   #8
sAe23
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Quote:
Originally Posted by Truitt View Post
I don't really thing is an engine problem. It runs really smooth the whole time. No engine codes at all. I feel like its a drivetrain thing. But it doesn't make sense to me that I doesn't do it all the time or become worse at highway speed.
If it only happens when you "punch it", then one might be tempted to suggest that you *don't DO that*!

But, there is probably some hidden issue just waiting to bite you on the butt so, as Project1 suggested, check your motor and transmission mounts. Also look at the condition of your U-joints and bushings.

You say you just bought it WITH a 3" lift installed and no SYE, correct?
Can you tell if there is a T-case drop kit installed?
Chances are your drive line angles are off. MAYBE it's off just enough to only cause vibes under a heavy load

And to verify how much lift you have, measure from the center of the axle to the bottom of the fender flair. Stock is 17.5" front and 17" rear.
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Unread 12-27-2012, 06:36 AM   #9
Truitt
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You are correct. I think it is about a 3 inch lift. There's no t case drop. The previous owner cut out the fender wells and installed flares so its really hard for me to tell. The angle of the driveline doesn't look to bad to me. I guess me best bet is to get it inside this weekend and just spend some time crawling around under it. I don't really care much for crawling around in the snow if I don't have to.
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Unread 12-27-2012, 10:14 AM   #10
buildin1XJ
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Have you checked engine and transmission mounts yet?
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Unread 12-27-2012, 07:05 PM   #11
Project1
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Yea workin on your car in the freezing cold sucks .....


And a mount or a bushing is a likely problem ..... But like b....1xj said .....

If it only does it when you do a drag race still launch ..... Well..... Just don't do that .... That's a good tip
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Unread 12-27-2012, 07:10 PM   #12
BigByrd47119
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Sounds like the trans mount.
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Unread 12-27-2012, 07:10 PM   #13
Truitt
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I haven't had time to check any of the mounts yet. Spare time is of a rare occurrence around here.
I know that the best way to avoid it is to probably quit doing what causes it in the first place but I just can't help myself. Especially since I just got it.
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Unread 12-27-2012, 07:58 PM   #14
Project1
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Originally Posted by Truitt View Post
I haven't had time to check any of the mounts yet. Spare time is of a rare occurrence around here.
I know that the best way to avoid it is to probably quit doing what causes it in the first place but I just can't help myself. Especially since I just got it.
I know the feeling .... That's why I don't ride bikes any more and stick to jeeps ....lol...... Because I just can't help hallin @$$ never goes away ...lol
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Unread 12-27-2012, 09:02 PM   #15
Truitt
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Originally Posted by Project1 View Post

I know the feeling .... That's why I don't ride bikes any more and stick to jeeps ....lol...... Because I just can't help hallin @$$ never goes away ...lol
It's funny you said that. I actually traded my R6 for the xj.
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