at idle has a weird vibration - JeepForum.com

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post #1 of 25 Old 02-16-2012, 07:26 AM Thread Starter
edcalli
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1994 ZJ 
 
Join Date: Feb 2012
Location: orwell
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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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post #2 of 25 Old 02-16-2012, 08:00 AM
squazz
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1993 ZJ 
 
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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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post #3 of 25 Old 02-16-2012, 08:25 AM
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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post #4 of 25 Old 02-16-2012, 10:17 AM
speedbucket
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1993 ZJ 
 
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Clean your throttle body and IAC


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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #5 of 25 Old 02-16-2012, 11:52 AM Thread Starter
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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post #6 of 25 Old 02-16-2012, 05:03 PM
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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Originally Posted by rooster51 View Post
Whats the worse that can happen? Your jeeps already broke.


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post #7 of 25 Old 02-16-2012, 06:47 PM
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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post #8 of 25 Old 02-17-2012, 02:42 PM
hdrocknroll
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Any one else ,like to chime in here?
It would be greatly appreciated

Always !! Keep A Firm Grip On Your Tool !!

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Quote:
Originally Posted by rooster51 View Post
Whats the worse that can happen? Your jeeps already broke.


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post #9 of 25 Old 02-17-2012, 05:47 PM
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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post #10 of 25 Old 02-17-2012, 05:57 PM
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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post #11 of 25 Old 02-17-2012, 06:24 PM
cdaniels85
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I'm in this boat as well. Misery loves company.
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post #12 of 25 Old 02-18-2012, 05:54 AM
hdrocknroll
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Could this be something like torque converter, or trans related ?

Always !! Keep A Firm Grip On Your Tool !!

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


Quote:
Originally Posted by rooster51 View Post
Whats the worse that can happen? Your jeeps already broke.


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post #13 of 25 Old 02-18-2012, 11:14 AM
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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post #14 of 25 Old 02-18-2012, 04:36 PM
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.

Always !! Keep A Firm Grip On Your Tool !!

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


Quote:
Originally Posted by rooster51 View Post
Whats the worse that can happen? Your jeeps already broke.


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post #15 of 25 Old 02-20-2012, 06:37 PM
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.
Attached Thumbnails
DSCI0269.JPG   DSCI0268.JPG  

Always !! Keep A Firm Grip On Your Tool !!

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


Quote:
Originally Posted by rooster51 View Post
Whats the worse that can happen? Your jeeps already broke.


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idle issue , idle problems , idles rough , vibrating , vibration

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