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Old 11-06-2011, 01:51 PM   #1
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Chatter at take-off

When I let out the clutch, I get a chatter around 1200 RPM. It does it about half the time. It last about 1/2 to 1 second. Sometimes it does it when I shift to second and it chatters around the same RPM range. Does not do it in 3, 4, and 5.

There is no loss of power, clutch feels like its grabbing. Just an audible chatter.

Any clues what it could be?

1992 4.0L YJ

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Old 11-06-2011, 02:03 PM   #2
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Heavy on the skinny peddle? It could be the Slip yoke. What size wheels are you running?

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Old 11-06-2011, 02:11 PM   #3
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31". No lifts.

I just replaced the transfer case rear seal, the rear end pinion seal, and both rear drive shaft U-joints about 1,000 miles ago. It started this just this week.
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Old 11-06-2011, 03:36 PM   #4
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May be time to resurface flywheel and replace clutch. If flywheel is scored and uneven it will cause chatter
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Old 11-06-2011, 03:44 PM   #5
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If it doesn't actually make the Jeep shake, could be a lifter or two sagging. Next time it happens, watch your oil pressure gauge to see if it does it at the lowest point of oil pressure. When the lifters do sag, they create more gap at the rocker than should be and will make a loud rattle sound.
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Old 11-06-2011, 05:44 PM   #6
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If it is shaking the Jeep, it's your clutch. I had the same problem. Just replaced the clutch and turned the fly wheel two weeks ago. Problem solved.
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Old 11-06-2011, 07:03 PM   #7
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What happens if I don't do anything about it now?

The PO replaced the clutch about 30k miles ago. Not sure if they refaced the flywheel.
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Old 11-06-2011, 08:13 PM   #8
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It only takes a dozen or so bad launches to ruin a clutch. I could fry one in a mile if i wanted to. If its chattering it will just get worse over time and eventually just fail. Babying it the key to long clutch life. Hard high rpm launches will fry one quickly.
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Old 11-07-2011, 05:33 PM   #9
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I'm not discounting the advise that it might be your clutch because that is certainly a possibility, however, I have the same exact symptoms and I just found the driver side motor mount is completely shot. The rubber is broken apart and the engine has about an inch to move around. New mount is on it's way. I'll post anupdate when it is installed this weekend. I am hopeful that that is the whole problem for me, but I could be in for some clutch service as well. We'll see.....
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Old 11-08-2011, 03:52 PM   #10
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^ good point. Never thought about a bad motor mount being the problem.
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Old 11-10-2011, 10:52 PM   #11
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mine chatters like that too check the ehaust mount by the Tcase above the skid plate mine was broken mine chattered when it was warming up
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Old 11-23-2011, 12:01 AM   #12
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I've been away from the computer for awhile.

I checked for clutch chatter. It still chatters while the Jeep is still, clutch in or out, at about 1100 RPM.

The motor mounts looked okay. The motor doesn't move a lot when you rev it, so I think they're okay.

When I was doing all this, it stopped chattering when I tried to recreate the problem.

I'll check the exhaust mounts tomorrow. I'm at a loss for what this could be.

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