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Discussion Starter · #1 ·
If it's not one thing then it's another. I took my CJ7 wheeling a month or so ago and have not driven it since. When I parked it the idle was really rough. I had to drive today and the idle was so bad that I stopped on the way to work and had a quick tune-up done to set the idle. Well, now that idle was fixed I noticed a new problem. Under acceleration the whole jeep vibrates like crazy. It only really seems to do it in 2nd and 3rd gears. It's pretty bad. I check the firing order just in case. Any ideas out there? I check my driveline to make sure that it was not dented. It is fine. The part I have a hard time exlaining is how it does not vibrate in 1st gear. I can be in 1st doing 30mph, shift to second and boom-vibration. Any ideas? I sure could use some help!

Toes

 

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/wwwthreads_images/icons/smile.gif Before you change the crankshaft, check to see if one of the motor mounts is broken./wwwthreads_images/icons/crazy.gif Oh, and one more thing....it is a big help to fill out your profile so we know what sort of Jeepie CJ you have./wwwthreads_images/icons/crazy.gif

CJDave
 

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How's the top gear performance? .......or does it only happen in 2nd and 3rd?......under hard throttle ......or even if you're accellerating like you have an egg between your foot and the gas pedal?.........does it happen the entire time you're accelerating in the gear or does the event start near the mid point or high end of the accelleration curve?......and does it stay at a constant level .......or does the severity increase with increased speed and not just the frequency of the vibration?.........does it "work itself out" after you get it beyond a certain point
Give some details.......if you can answer these type of questions you should be able to isolate it to timing/ignition/wires, carburation, or drivetrain/motor mounts/etc..

GeeAea
 
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Discussion Starter · #4 ·
You say it only happens in 2nd and 3rd? I'd check your U-joints first too. Not a hard thing to do, and EVERY time I have a vibration that occurs in gear, I check my driveline first. You could have dried out the needle bearings or broken a bearing cap on one of the Us while you were off-road. Check the slop in the drive and then pull it down one end at a time. The two times that I've changed my Us it was doing exactly what you descibed, nothing in first gear but a terrible jiggle in second and so bad in third that you didn't want to go to fourth! Good luck and let us know.

Sully '84 CJ7 Laredo 258 w/HEI

 
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Discussion Starter · #6 ·
Just curious, 30 mph in first gear? That's some TALL gearing. /wwwthreads_images/icons/shocked.gif with gearing that tall maybe you have started to fry your clutch. Just a thought.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
 
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Discussion Starter · #7 ·
What tranny do you have? If it is a 904/999 auto the torque converter might be locking up too soon. The bands also have adjustment in these trannies but I don't know if that would cause vibration.

 
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Discussion Starter · #8 ·
I had a VERY similar problem and last weekend I finally decided to do something about it and it was the U-joints, the needle bearins were completely gone!! So check your U-joints it only cost me 15 bucks for two brand spanking new U-joints

absolutjeep
 
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Discussion Starter · #9 ·
Thanks for the help everyone. I will check them out this weekend. I kind of suspected that it may be the u-joints. I bought two new ones 7 months ago, but was too lazy to change them. I guess they have finally given out. I will post once I'm done to let you all know what good shade-tree mechanics you are!

Toes

 
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