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Unread 02-16-2012, 07:26 AM   #1
edcalli
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1994 ZJ 
 
Join Date: Feb 2012
Location: orwell, oh
Posts: 63
at idle has a weird vibration

The vibration can be felt throughout the hole vehicle it kind of seems like a low idle because if u press the gas a little it goes away. The idle is btw 500 and 750rpm.it doesnt do it at cold start up when rpms are higher

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Unread 02-16-2012, 08:00 AM   #2
squazz
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if it aint missing I would start by checking the motor mounts and transmission mount as well
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Unread 02-16-2012, 08:25 AM   #3
jnowak
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Mine does the same. About 1k smooths right up. But at idle all the windows and plastic shake
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Unread 02-16-2012, 10:17 AM   #4
speedbucket
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Clean your throttle body and IAC
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Unread 02-16-2012, 11:52 AM   #5
edcalli
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Quote:
Originally Posted by speedbucket View Post
Clean your throttle body and IAC
i'll try cleaning throttle body and iac thanks 4 advice.
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Unread 02-16-2012, 05:03 PM   #6
hdrocknroll
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Quote:
Originally Posted by squazz View Post
if it aint missing I would start by checking the motor mounts and transmission mount as well
Mine to
So !! how do you go about checking the motor mounts and transmission mount.
already cleaned throttle body and IAC, new crank sens, o2 sens,full tune up.
Is the transmission involved in the equation ,when in park ?
Edit: Mostly only doing it in gear.
Only vibration in neutral or park is a little when engine is brought up to 1500 rpm at 2000 it goes away
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Unread 02-16-2012, 06:47 PM   #7
mikethefisher
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mine has the same vibrating syptoms, in drive and park. it vibrates more in drive but when you put it in neutral the vibrating starts.
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Unread 02-17-2012, 02:42 PM   #8
hdrocknroll
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Any one else ,like to chime in here?
It would be greatly appreciated
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Unread 02-17-2012, 05:47 PM   #9
jnowak
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I have done all the approiate cleaning and tune ups. I am leaning toward engine mounts only thing i havent check
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Unread 02-17-2012, 05:57 PM   #10
4Slow9erHybrid
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It's a common complaint for the 4.0L ZJs. There's no definitive solution. Keeping the IAC clean, tune up helps but doesn't get rid of it. I replaced 1 engine mount and the tranny mount with no change. The new Anchor driver's side mount was defective, hence could not change it.
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Unread 02-17-2012, 06:24 PM   #11
cdaniels85
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I'm in this boat as well. Misery loves company.
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Unread 02-18-2012, 05:54 AM   #12
hdrocknroll
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Could this be something like torque converter, or trans related ?
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Unread 02-18-2012, 11:14 AM   #13
cdaniels85
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Quote:
Originally Posted by hdrocknroll
Could this be something like torque converter, or trans related ?
I first thought the same thing, then I had my tranny looked at and was told it is in great working order. I think it's mostly a combination of an inline engine and worn mounts. The mounts don't appear to be shot, but I think it just takes a little wear and the nature of this beast takes over.
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Unread 02-18-2012, 04:36 PM   #14
hdrocknroll
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Well !! It Doesn't look to hard to replace the three mounts.
Not expensive, I can get all three for 60 bucks.
I will take a look at them, and see what I can see. I don't know what else it could be.
After I replace them ,I will let you all know if it helped or not.
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[QUOTE=rooster51;13297693] Whats the worse that can happen? Your jeeps already broke.



[/QUOTE]
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Unread 02-20-2012, 06:37 PM   #15
hdrocknroll
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Well, my motor mounts were shot.
Replaced them today and dudes, it's running smooth. Now, only a very very slight vibration but I haven't done the trans mount yet.
The difference is like night and day. I don't know if this is everyone's problem with the shaking, vibrating, but it sure was mine.
The left one that I didn't take a picture of was a little worse than the one in the pic.
If yours are as bad as mine were, all you have to do is reach down there, and and see if you can stick your finger through it, if you can its shot.
You can see the old one is even separated at the bottom.
I put it in the snow so you could see the separation.
The second pic is not very good but the new one is on the left.
dsci0269.jpg   dsci0268.jpg  
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Always !! Keep A Firm Grip On Your Tool !!

Watch Out For The Air Hose Gone Wild!! Or Wear A Cup,: True Story


[QUOTE=rooster51;13297693] Whats the worse that can happen? Your jeeps already broke.



[/QUOTE]
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idle issue , idle problems , idles rough , vibrating , vibration

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