Engine vibration - Kia Forum
 
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post #1 of 10 (permalink) Old 08-03-2010, 01:34 PM Thread Starter
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Default Engine vibration

I just had the timing belt and balance belt replaced in my '02 Optima 2.4L Engine. Since then there is a heavy vibration in the motor that is more pronounced between 1100 and 1500 RPM and again between 2500 RPM and 3100 RPM. It is creating a resonance in the cab that is rattling just about anything that is not tied down. Are ther any ideas to what this could be caused by?
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post #2 of 10 (permalink) Old 08-03-2010, 02:05 PM
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Did you check the motor mounts, I here it is common for them to get broke during timming belt changes.
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post #3 of 10 (permalink) Old 08-03-2010, 02:55 PM
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Sorry to hear Ken. I had the same problem on mine. Just fixed it a couple days ago (Saturday 7/31). My front balance shaft was out of time (the one driven by the timing belt). The shaft is gear driven, and gear reduced, inside the block. Just because the mark on the pulley lined up doesn't mean the shaft is in time. When timing the shaft, there is a plug on the block (behind the exhaust manifold). Insert a screwdriver in the hole, if it won't go in, the shaft isn't timed. If it goes all the way in, you're good to go.
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post #4 of 10 (permalink) Old 08-03-2010, 04:04 PM Thread Starter
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Default Engine Vibration

The garage checked the motor mounts and found they are stretched slightly but not ripped. However, when they told me that they had to change the timing belt they let me know that found this other (Balance Belt or little belt) that should be replaced too. I now suspect they did not properly align the gear when they installed the belt.
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post #5 of 10 (permalink) Old 08-06-2010, 05:55 PM
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Default Crankshaft Position Sensor??

There's a lot of posts on here that point to the CPS. It probably should be changed everytime you change the timing belt. Do a search and read the posts. I'll think you'll agree that it's worth a look. BTW, I'm totally with the balance shaft diagnosis as well but what I've read about the CPS is interesting.
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post #6 of 10 (permalink) Old 08-27-2010, 11:56 AM
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Default Passenger side motor mount

I have the same vehicle and a while ago I had a garage change the timing belts. Afterward, I had the same horrible vibration. I took it back and they said "everything is fine", including the motor mounts.

Recalling that the passenger side motor mount must be removed to change the belts, I was suspicious. I determined that they simply unbolted one side of the moumt and then rotated it out of the way. In the process, they punctured the mount. This is a fluid filled mount and a puncture will allow all the fluid to leak out.

I didn't want to take it back to these guys and argue with them, so I bought an aftermarket mount from Rock Auto and installed it myself. Problem fixed!
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post #7 of 10 (permalink) Old 04-23-2011, 01:28 PM
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Did the timing belt and balance shaft belt on my 2004 Optima 2.4L and now when in Drive waiting for a stoplight it vibrates.


The vibration wasn't there until about 6 months ago, i did the belts in august 2009.

Last time i looked into the issue i had unbolted the driver side motor mount because i was already there and supported the engine with a block of wood and a jackstand, and when i put it in Drive the vibration was gone.


I suspect one of the motor mounts ( driver side ) is bad, even though i dont see any fluid leaks .

If it was the balance shaft being out of time i would think the vibration would be there all of the time .

If in Park at any RPM range it doesn't vibrate at all.


Only when in Drive at idle .

Are motor mounts going bad common on these cars?

2004 Optima 2.4 LX auto ( original owner )

Last edited by amave2008; 04-23-2011 at 01:32 PM.
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post #8 of 10 (permalink) Old 04-23-2011, 05:19 PM
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Have seen a few bad passenger side engine mounts. If the mount is bad, usually if you get a pry bar and move the mount around some, the vibration will change. It is fairly easy to change with a floor jack and basic hand tools.
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post #9 of 10 (permalink) Old 04-23-2011, 05:35 PM
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Quote:
Originally Posted by spongebob218 View Post
Have seen a few bad passenger side engine mounts. If the mount is bad, usually if you get a pry bar and move the mount around some, the vibration will change. It is fairly easy to change with a floor jack and basic hand tools.
yeah i was thinking one of the mounts was bad , since an out of time balance shaft would vibrate throught the RPM range. And mine only vibrates when in drive at idle and no other RPM.




The weird thing is when i went to check the motor mounts, the transmission mount on the drver side under the airbox, i disconnected it and jacked up the trans. with a jack stand and wood , and put it in Drive and the vibration went away at idle.


I guess changing both left and right motor mounts is god insurance

2004 Optima 2.4 LX auto ( original owner )
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post #10 of 10 (permalink) Old 02-08-2012, 12:59 AM
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In your post you said "I guess changing both left and right motor mounts is good insurance". Did you do it on your car and did it cure the problem.
--------------------------------------
Also an original 2004 Optima 2.4 LX owner experiencing the same idle vibration issue in Drive
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