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Old 03-08-2011, 11:06 AM   #1
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Unhappy Darn Vibrations

I own a 93 2.5 STD wrangler and i'm experiencing some vibrations which appear to be coming from the engine at idle. The vibrations occur whenever im under 1RPM and as soon as i rev over 1 the vibrations disappear. I dont feel any vibrations at all when i'm driving, just when i come to a stop. Ive changed the spark plugs, wires, rotor cap, and the engine was recently overhauled. Any ideas? im stumped
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Old 03-08-2011, 11:08 AM   #2
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Motor mounts, have you checked those.

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Old 03-08-2011, 11:09 AM   #3
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also replaced motor mounts and transmission mount
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Old 03-08-2011, 12:14 PM   #4
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i have the exact same problem. i also have changed spark plugs/wires, dist. cap, and rotor. im going to have to change the motor/trans mount(s).

is it a real PIA to do this?
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Old 03-08-2011, 12:20 PM   #5
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Does it stop when it warms up?
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Old 03-08-2011, 12:24 PM   #6
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Quote:
Originally Posted by Rcordero View Post
Does it stop when it warms up?


nope mine doesn't...
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Old 03-08-2011, 12:29 PM   #7
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Who's motor mounts did you install? There are threads on the forum about some of the bushings being stiffer than the stock rubber mounts and actually making engine vibes worse.
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Old 03-08-2011, 12:32 PM   #8
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Originally Posted by whiteyj View Post
Who's motor mounts did you install? There are threads on the forum about some of the bushings being stiffer than the stock rubber mounts and actually making engine vibes worse.
if this is directed to me....i haven't changed them yet lol.
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Old 03-08-2011, 12:32 PM   #9
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we are having the same problem on one of our Mack over the road trucks. Now i know its not the same as a jeep but here is what we think it is. we have replaced rearend, balanced driveshafts, replaced u joints and remounted and balanced front tires. It is our belief now the its either harmonic balancer or the flywheel. Just a thought for you.
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Old 03-08-2011, 01:35 PM   #10
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I had vibrations like this on a Camaro once. it went away with increased RPMs so we just upped the idle till it went away. Kept driving like that until the Flywheel fell off. Found out what the problem was the easy way. Not the best way.

Do the Vibes change if you are in a gear or neutral. do they change if you have the clutch engaged or not?
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Old 03-08-2011, 02:33 PM   #11
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Quote:
Originally Posted by cyanez3 View Post
I own a 93 2.5 STD wrangler and i'm experiencing some vibrations which appear to be coming from the engine at idle. The vibrations occur whenever im under 1RPM and as soon as i rev over 1 the vibrations disappear. I dont feel any vibrations at all when i'm driving, just when i come to a stop. Ive changed the spark plugs, wires, rotor cap, and the engine was recently overhauled. Any ideas? im stumped
I think undead-89 hit it, you mentioned just overhauled, bad damper or loose flywheel if engine idles smoothly
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Old 03-08-2011, 06:00 PM   #12
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Quote:
Originally Posted by Undead-89
I had vibrations like this on a Camaro once. it went away with increased RPMs so we just upped the idle till it went away. Kept driving like that until the Flywheel fell off. Found out what the problem was the easy way. Not the best way.

Do the Vibes change if you are in a gear or neutral. do they change if you have the clutch engaged or not?
The vibes are only when I'm at a dead stop. In neutral and in first gear, doesn't matter. Always when I'm in a dead stop.
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Old 03-09-2011, 12:31 AM   #13
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my vibrations are whenever im a stop, regardless of whether its in gear or neutral. i forgot to mention i also changed the harmonic balancer. And actually it does not vibrate when its cold at start up, but instead after a while when its warmed up. The motor mounts are the original replacements not polyeuthrane or anything like that
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Old 03-09-2011, 01:32 AM   #14
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I'm still thinking Flywheel. but I would check the Harmonic balancer and make sure it is still torqued properly and spinning straight when the engine is running.
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Old 03-09-2011, 10:09 AM   #15
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how difficult is it to get to the flywheel?
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Old 03-09-2011, 10:19 AM   #16
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You have to remove the Skid plate, Drive shafts, Transfer case, Transmission and Bell housing.
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Old 03-09-2011, 10:29 AM   #17
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ahhh i was afraid of an answer like that.

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