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Old 03-02-2012, 07:36 PM   #1
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Vibration at Idle still not fixed

Well, I am still having an annoying vibration at idle that is annoying the crap outta me. It shakes the seat, shifter, steering wheel, and if I have a bottle water you can see the water vibrating. It is not a violent shake, but is just plain annoying and isn't normal. It all happened after I had my exhaust manifold replaced and engine mounts replaced. Well, that is when I noticed it at least. Ever since I noticed the vibration, I have been trying to find the cause. I have cleaned and replaced many things so far. My jeep idles around 700-800 RPMs. Here is what I have done so far.


New plugs, wires, Distributor cap and rotor
Cleaned throttle body
Cleaned IAC valve
New TPS Sensor
Checked for vacuum leaks and found none
Made sure exhaust manifold and intake bolts are tight and there is no leaks
New water pump
New timing chain, sprockets, tensioner, guide
New idler pulley
New power steering pump and pulley
New Harmonic Balancer
Replaced the crank sensor and didn't help so I returned it
Replaced the ignition coil and didn't help so I returned it

This is all I can think of so far. After I had my timing chain kit installed I notice a tapping that sounds like it is coming from the distributor sometimes. It eventually goes away but comes back sometimes. My stethoscope is pointing to the distributor.

With all of this said, do you think my Distributor may be the problem? I can get a remanufactured one locally for cheap. I am at a lost and need some help.

My jeep has the normal valvetrain noise and thought I might have a collapsed lifter but my engine doesn't seem to miss. It does have 178,000 miles and seems a little sluggish but nothing out of the ordinary.

I am just trying to see what I should do next.

Replace the distributor? What are the signs of a bad distributor?

Thanks!

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Old 03-02-2012, 10:15 PM   #2
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play in the shaft

how much vacuum does it pull at idle when you put a vacuum gauge on one of hte manifold lines? the gauge is 24 bucks from advance auto and will tell you many things about your engine.

if you go in jeepforums and search for a thread in the yj section called proper use of a vacuum gauge on the first page, it has links to use the gauge to tell if you have leaky valves, oil needs changing, head gasket, timing is off, tons of things.

also, have you checked for slack in your timing chain? i was just asked this in the thread i just told you about and i have not done it but i bet that could give you some trouble, you have lots of miles

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Old 03-02-2012, 11:17 PM   #3
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Run a compression check sounds like a burnt valve.
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Old 03-03-2012, 07:29 AM   #4
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Quote:
Originally Posted by busemans View Post
play in the shaft

how much vacuum does it pull at idle when you put a vacuum gauge on one of hte manifold lines? the gauge is 24 bucks from advance auto and will tell you many things about your engine.

if you go in jeepforums and search for a thread in the yj section called proper use of a vacuum gauge on the first page, it has links to use the gauge to tell if you have leaky valves, oil needs changing, head gasket, timing is off, tons of things.

also, have you checked for slack in your timing chain? i was just asked this in the thread i just told you about and i have not done it but i bet that could give you some trouble, you have lots of miles

I can't find that link Busemans. I found others but not that one. Maybe its time to run a compression test and check the vacuum. Just never did this stuff before so I need a good write up of each somewhere. I still may try and replace my distrbutor to ensure that tap noise is nothing serious. I can get one cheap. My jeep doesn't run bad though. Mainly just a rough idle. WOuldn't a burnt valve be very noticeable in the performance?
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Old 03-03-2012, 10:55 AM   #5
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It would be down on power, mostly on low RPMs, and shake a little at idle.
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Old 03-03-2012, 11:49 AM   #6
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Well, I did a compression test and vacuum test. Compression was good. Around 150 on 3 of the cylinders and 145 on 1. I hooked up a vacuum guage where the MAP sensor is and got around 16.
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Old 03-03-2012, 02:40 PM   #7
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well now you know that's not it, sound like with all you have done it should run perfect.
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Old 03-03-2012, 03:14 PM   #8
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You mentioned replacing the motor mounts and exhaust manifold prior to this happening. I don't see what year you have but.......I know you checked but make sure the manifold and exhaust are clearing the frame etc.....second....what kind of motor mounts did you use??If they are the poly ones they are much stiffer and will give you a vibration , make sure the passenger side mounting bracket is not cracked.

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