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engine vibration & shaking issue.

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Old 01-16-15, 12:19 AM   #1
poplinux
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Default engine vibration & shaking issue.

Dear Sir.

Model : LS430 2001.

Recently, sometime occured vibration & shaking and rocking on my car.

I'm opened my bonnet and checked ENGINE. I'm see vibration of engine.

This vibration occured low-RPM and low-speed.

Not occured middle or high RPM. not occured ALERM.

Why happend this situation for MY LS430?

Plase advise to me.
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Old 01-16-15, 04:42 AM   #2
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I would check the engine mountings as well as the gearbox mounting

You didn't say whats the mileage on your car?
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Old 01-16-15, 05:31 AM   #3
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You may also want to start with the basics... The cause of the vibration may just possibly be rough idling.

Take a look at this DIY http://www.clublexus.com/forums/ls43...-cleaning.html to clean your MAF and throttle body. Please pay special attention to the "Idle Port".

But if you're convinced that you do not have an excessively low idle or rough idle, then I would agree that the 2 engine mounts and the rear transmission mount are likely your prime suspects.

Good luck troubleshooting - please update us with your progress.
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Old 01-16-15, 06:20 AM   #4
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Thank's Twix, rkw77080.

This video clip is my LS430's engine.

almost time, My ls430's engine is very nice. But sometime's occured vibration.


Tomorrow I'll go to service center. And i'm wish to repaired my car.

Thank you.
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Old 01-16-15, 08:01 AM   #5
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You are right, the shaking seems excessive. What's your idling RPM? How long ago since you replaced your spark plugs? Are you getting any DTC (error codes)? Did this just start happening recently?
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Old 01-16-15, 08:11 AM   #6
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is the car driving any differently? if not then most likely the engine mounts and transmission mount has gone bad. i believe these are fluid filled also.
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Old 01-17-15, 04:22 AM   #7
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Quote:
Originally Posted by poplinux View Post
Dear Sir.

Model : LS430 2001.

Recently, sometime occured vibration & shaking and rocking on my car.

I'm opened my bonnet and checked ENGINE. I'm see vibration of engine.

This vibration occured low-RPM and low-speed.

Not occured middle or high RPM. not occured ALERM.

Why happend this situation for MY LS430?

Plase advise to me.
Aww how cute! There's something about seeing someone trying to speak another language especially when u know what their trying to say that just connects us all as one. I don't know, I can't explain it, it's a warm fuzzy feeling I get that just helps me to appreciate how alike and important we all are no matter where we are on the planet.

To stay on topic, if no codes are being thrown, I'd have motor mounts and transmission mounts checked.
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Old 01-17-15, 04:32 AM   #8
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As long as your car is not misfiring then the most logical explanation is the motor mounts are shot. All 3 are wearable items and are usually due between 150 - 200 thousand miles. The rear motor mount (at the transmission) is very easy to do. The front two are a bit more difficult. Do not use aftermarket on these items. They are known to be poor quality.
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Old 01-18-15, 03:21 AM   #9
poplinux
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Quote:
Originally Posted by rkw77080 View Post
You are right, the shaking seems excessive. What's your idling RPM? How long ago since you replaced your spark plugs? Are you getting any DTC (error codes)? Did this just start happening recently?
More infomation.
2 Month ago, Batteries come discharged. So I'm change the battrry do myself.



1. Idel RPM.
Sorry. i'm not checked IDLE RPM. and my LS430 was dressed in a garage.
The Mechanic said to me "IDLE RPM is very low. but need more time to me"

2. spark plug
The spark plug and IGNO coil will be replace this time.
spark plug were 100,000 km used.

3. DTC code
No DTC code
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Old 01-18-15, 03:27 AM   #10
poplinux
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Quote:
Originally Posted by LiCelsior View Post
is the car driving any differently? if not then most likely the engine mounts and transmission mount has gone bad. i believe these are fluid filled also.
Dear sir.

Thank's your advice. Mechanic will be check mount's.

Thank you.
\
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Old 01-18-15, 03:31 AM   #11
poplinux
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Quote:
Originally Posted by Lavrishevo View Post
As long as your car is not misfiring then the most logical explanation is the motor mounts are shot. All 3 are wearable items and are usually due between 150 - 200 thousand miles. The rear motor mount (at the transmission) is very easy to do. The front two are a bit more difficult. Do not use aftermarket on these items. They are known to be poor quality.
Dear Sir.

I seems to be misfiring. So i'll change spark plug & IGN coil.
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Old 01-18-15, 09:31 AM   #12
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Well hopefully it's just spark plugs, I've never known a 3UZ-FE to fail!

GL.
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Old 01-18-15, 12:21 PM   #13
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Just so you know, a visual inspection of the mounts does not help. Mine look new from the outside but they are getting close. The rear mount did not look bad but replacing it helped with less movement during shifts. You would never know by visually inspecting it. The rubber becomes soft and flexible and does not isolate vibrations. This is also true of the sway bar bushings.

Last edited by Lavrishevo; 01-18-15 at 12:25 PM.
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Old 01-18-15, 05:41 PM   #14
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There could be a few issues occurring simultaneously.

1) Motor mounts

2) Engine coolant temperature sensor

An engine coolant temp sensor would be the most likely cause of a low idle, which would make a motor mount issue even worse. If the motor doesn't vibrate when you drive ~100 km/h, then it's very likely at least one of those issues.
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Old 01-22-15, 07:11 PM   #15
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Hello. everybody.

Mechanic are show up check report to me.

1. motor mount
=> is ok.

2. coolant temperature sensor
=> is ok.

3. spark plug and IGN coil
=> is ok.(replace all spark plug and IGN coil)

After use a car scanner, found "VTEC system fail" code.

My Mechanic said to me. will replace "OCV valve".

Almost "VTEC system fail" code is can repaire that replace "OCV valve"

I'm just waiting the this work.
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